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How to Build a Catamaran Boat? (Step-by-Step Guide)

fabrication d'un catamaran

Building a catamaran boat from scratch is a rewarding and challenging endeavor.

It takes a combination of skill, dedication, and hard work to craft a seaworthy vessel.

In this step-by-step guide, you’ll learn how to design and size your catamaran, gather the necessary materials, cut and assemble the pieces, lay fiberglass and apply epoxy, make finishing touches, add hardware and paint, and rig the boat.

With the right tools, planning, and patience, you can make your dream of sailing in a catamaran a reality.

Table of Contents

Short Answer

Building a catamaran boat requires a lot of patience and skill.

The first step is to choose the right materials for the hull, such as fiberglass, wood or aluminum.

Then, you will need to build the frame of the boat, which includes the crossbeams and the main hull.

After that, you will need to install the decking, the rigging, and other components.

Finally, you will need to paint and varnish the boat, as well as install the outboard motor and other accessories.

Design & Size Considerations

When it comes to building a catamaran boat from scratch, the first step is to determine the design and size of the boat.

This should take into account the intended use of the boat, such as sailing, fishing, or leisurely cruising.

The size of the boat will depend on the number of passengers and the type of activities the boat will be used for.

For instance, a larger boat may be needed if passengers will be standing or participating in watersports.

The design of the boat is also important and should be chosen based on the intended use.

If you are looking to build a sailboat, you will need a design that is optimized for sailing.

On the other hand, if you are looking to build a fishing boat, you will need a design that is optimized for fishing.

There are a wide variety of boat designs available, so it is important to research and choose the one that best suits your needs.

In addition to the design and size, you will also need to consider the materials used for construction.

The most common materials for building a catamaran boat are wood, fiberglass, and epoxy.

Each material has its own advantages and disadvantages, so it is important to research them and determine which one is best for your project.

Finally, you will need to consider the cost of the project.

Building a catamaran boat from scratch can be a costly endeavor, so it is important to have a budget in mind before you begin.

The cost will depend on the type of materials used and the complexity of the design.

It is also important to factor in the cost of any tools that may be needed for the project.

By taking into account the design and size, materials, and cost of the project, you can be sure to build a catamaran boat that meets your needs and budget.

With the right amount of patience and attention to detail, you can build your own catamaran boat in no time.

Gathering Materials

fabrication d'un catamaran

Gathering the materials needed to build a catamaran boat from scratch can be a daunting task, but it is essential for creating a sturdy and safe vessel.

Before starting the building process, it is important to have an accurate and detailed plan for the boats design and size.

Once a plan is in place, it is time to begin sourcing the necessary materials.

The most common materials used to construct a catamaran boat are wood, fiberglass, and epoxy.

When choosing wood, it is best to select a species of timber that is strong and durable, such as mahogany, teak, or cedar.

Additionally, the wood should be clear and free of knots, splits, and other defects.

Fiberglass is a lightweight fabric that is resistant to water and provides additional strength to the boats hull.

Epoxy is a waterproof adhesive that is used to seal the boat and ensure that it is watertight.

It is important to ensure that the materials are of high quality, as this will help to ensure the boats longevity.

Additionally, it is important to purchase the necessary materials in the correct amount and size.

Too little or too much of a material can be a costly and time-consuming mistake.

Finally, it is important to keep any leftover materials for future repairs or modifications.

With the right materials gathered, the next step is to cut the wood and begin the assembly process.

Cutting & Assembly

Cutting and assembly are the most important steps when it comes to building a catamaran boat from scratch.

The first step is to decide the design and size of the boat.

This will determine the type of materials you need to gather and the amount of effort that needs to be put into the project.

After deciding on the design and size, you will need to cut the wood to fit the design.

This includes cutting the wood to the desired size, as well as cutting any additional pieces that may be needed to complete the design.

It is important to ensure that all the pieces fit together correctly and securely, as any mistakes could lead to a weak boat.

Once the wood has been cut, it is time to assemble the pieces together.

This involves attaching the pieces together with glue, screws, and nails, and ensuring that the pieces fit together securely.

It is important to be careful and patient when assembling the pieces, as any mistakes could result in a weak and unstable boat.

Once the frame is ready, it is time to lay the fiberglass, and apply the epoxy to seal the boat.

This is an important step, as it will make sure that the boat is waterproof and durable.

Finally, you can add the finishing touches, such as the hardware, paint, and rigging.

With the right amount of patience and attention to detail, you can have your own custom catamaran boat in no time.

Laying Fiberglass & Applying Epoxy

fabrication d'un catamaran

When laying the fiberglass and applying epoxy, it is important to take your time and be precise.

Fiberglass and epoxy are key components of a catamaran boat, as they provide the strength and waterproofing necessary to keep the boat afloat.

Start by laying the fiberglass over the frame of the boat.

Make sure to cut the fiberglass to size and overlap the edges for a strong seal.

Once the fiberglass is in place, mix the epoxy and begin to apply it.

It is important to apply the epoxy in a thin, even layer to ensure a proper seal.

Make sure to move the epoxy around to get it into all the nooks and crannies of the boat.

Allow the epoxy to cure and then you can begin to add the finishing touches.

Finishing Touches

Once the frame of the catamaran boat is built, it is time to add the finishing touches.

This includes adding the necessary hardware, painting, and rigging the boat.

Hardware: Before adding the hardware, it is important to ensure that the frame is stable and secure.

Add the appropriate hinges, screws, and nails to the frame.

Make sure that the screws and nails are the correct size and do not exceed the recommended load capacity of the frame.

Painting: Once the hardware is added, it is time to paint the boat.

Choose a paint that is suitable for the materials used in the construction.

Make sure that the paint is applied evenly and that the frame is completely dry before applying the next coat.

Rigging: The last step is to rig the boat.

This involves attaching the sails, running rigging, and standing rigging to the masts and booms.

Make sure that the rigging is properly tensioned and secured.

Once all of these steps are complete, your catamaran boat is ready to sail.

Hardware & Paint

fabrication d'un catamaran

The last step in building a catamaran boat is to add the hardware and paint.

This step is often the most rewarding, as it is the finishing touch.

Depending on the design of your boat, there are various types of hardware you may need.

Some of the most common items are cleats, winches, fasteners, and decking.

After selecting the required hardware, you will need to install them on the boat.

It is important to use the correct type of screws and bolts, and to secure them tightly.

Once the hardware is installed, it is time to apply the paint.

The type of paint and color you choose will depend on the design of your boat.

It is important to use a high-quality marine grade paint that is designed to handle the extreme environment of the ocean.

If you are up to the challenge, you can add some custom artwork or detail to your catamaran boat.

Adding the hardware and paint is the final step in building a catamaran boat.

With patience and attention to detail, you can create a beautiful and unique boat that will last for many years.

Be sure to take your time and enjoy the process of constructing your own boat.

Once you have finished the frame, fiberglass, and epoxy of your catamaran boat, you will need to move onto the rigging.

This is a crucial step in the construction process, as it will keep your boat safe and secure on the water.

When rigging a catamaran, there are a few key components that must be taken into account.

First, you will need to determine the type of rigging you will be using.

Typically, catamarans use a combination of standing and running rigging.

Standing rigging consists of cables and lines that stay in a fixed position to provide stability and strength to the boat, while running rigging consists of lines that are used to adjust the sail and mainsheet.

Additionally, you will need to choose the right type of rope and hardware for your rigging setup.

The rope should be strong and durable, and the hardware should be made of stainless steel and be corrosion-resistant.

Once you have chosen the type of rigging and hardware, you can start assembling the rigging lines.

This process involves carefully measuring and cutting the lines to the proper lengths, and then attaching them to the mast and boom.

Depending on the type of rigging setup, you may also need to attach the lines to the hulls and deck.

It is important to inspect the rigging lines and hardware regularly to ensure that everything is secure and in proper working order.

Rigging a catamaran boat can seem like a daunting task, but it is essential for the safety and comfort of your vessel.

With the right tools, materials, and attention to detail, you can successfully and safely rig your catamaran boat.

Final Thoughts

Building a catamaran boat is a rewarding experience that requires patience and attention to detail.

With the right plan, materials, and steps, you can build your own boat in no time.

Now that you know the basics of how to build a catamaran boat, why not grab your tools and get started on your very own project? With the right motivation and dedication, you can make your dream of owning a catamaran boat a reality.

James Frami

At the age of 15, he and four other friends from his neighborhood constructed their first boat. He has been sailing for almost 30 years and has a wealth of knowledge that he wants to share with others.

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Fabriquer soi-même son mini catamaran, un guide pour la construction amateur

fabrication d'un catamaran

Construire un petit catamaran qui pourra servir d'annexe ou même de petit dériveur : voilà ce que propose ce petit fascicule avec tous les plans pour vous aider dans cette réalisation. Vous êtes tenté, Dominique vous accompagne. Suivez le guide !

François-Xavier Ricardou

Dominique est un autodidacte passionné de tout. Sa vie, il l'a construite sur des multicoques. Il aime d'ailleurs la raconter dans plusieurs livres ( retrouvez ici les livres de Dominique ) quand il ne bricole pas son embarcation ( retrouvez ici les choix de Dominique pour un catamaran à moteur ). Quand il doit penser à une annexe pour son dernier catamaran , c'est naturellement qu'il imagine un esquif avec 2 coques.

Il se met donc à sa table à dessin (celle du carré forcément) et conçoit une annexe de 3 m de long en contreplaqué époxy qui sera stable et volumineuse sans être trop lourde. Dans son petit guide "Dinghy en bois-époxy", il explique comment réaliser cette annexe. Une construction à la portée d'un amateur.

Dinghy en bois-époxy

Le livre est divisé en 2 parties : une première rédigée qui raconte et explique toute la construction (24 pages). La seconde partie comprend tous les plans ainsi que quelques photos de la construction et de l'annexe dans sa version finale.

Les plans pour le Dinghy en bois-époxy

Avec ce petit livre en main, vous pourrez donc construire votre propre annexe. Seulement, il faudra relire plusieurs fois le texte pour bien comprendre les assemblages et les différentes étapes. Il manque aussi quelques éléments clés comme la fiche technique finale de l'annexe (longueur, largeur, poids…). Enfin, le constructeur qui voudrait se lancer dans la réalisation devra bien réfléchir pour faire ses approvisionnements en matériaux. Aucune donnée sur le nombre de feuilles de contreplaqué ou bien sur la quantité de résine ne sont fournies. Rien non plus sur le cout de la réalisation… Dominique prévient que cette aventure s'adresse "en priorité, à des bricoleurs avertis".

La série de photo du Dinghy en bois-époxy

L'idée de proposer une annexe en construction amateur est une super idée. La réalisation de Dominique avec 2 couples en place de poutre pour la rigidité est bonne. Les plans semblent précis et les côtes bien détaillées. Il manque juste à ce petit ouvrage un peu de profondeur (et de détails) pour aider un constructeur qui ne serait pas aussi à l'aise que l'est Dominique dans l'usage des matériaux composites.

fabrication d'un catamaran

Dinghy en bois-époxy - Fabriquer soi-même son mini catamaran

  • Domi Montesinos
  • 17 x 21,9 cm
  • 19,90 €

fabrication d'un catamaran

fabrication d'un catamaran

DIY Cruising Catamaran: Complete Building Guide

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A brand-new cruising catamaran can set you back a hefty amount of money. However, a DIY cruising catamaran provides a more affordable way to own your own boat. While building a large boat can be an extremely challenging and time-consuming experience, nothing beats the pleasure of bringing your own boat to life. 

To build a DIY cruising catamaran, buy good design plans, determine your budget and find a working space. Next, choose your hull material, buy supplies and start building the mast beam. Build and sheathe the hull, install bulkheads, the interior, and finally, launch the catamaran boat.

In this article, you will find a complete guide to building your own catamaran. You will also find detailed information on why you may want to consider building your catamaran and approximately how much this project would cost. Finally, we will explore the advantages and disadvantages of building a catamaran from scratch.

Why You Might Want To Build Your Own Catamaran

Most people might think that purchasing a used boat to repair and fix it up would be cheaper than a DIY cruising catamaran. But while building your own catamaran could be an enormous undertaking, it also comes with many advantages over buying something used. 

Other than the unique opportunity to create beautiful memories and experiences while cruising, sailing, and exploring beautiful coastlines, there are a number of benefits that come along with the DIY approach.  

Knowing Your Boat

Building your own catamaran provides you with intimate knowledge of your boat. You will know every corner, including where to find every bolt, wire, bulkhead, rib, hose, and support as you installed them yourself. This knowledge will enhance your confidence while at sea since you will have entrusted your life to a boat whose history you are aware of and deeply connected to.

Pride of Ownership

The satisfaction you get from crafting something with your own hands is immense. As a result, the knowledge that you built your boat from scratch will fill you with absolute pride and an immense sense of achievement. Furthermore, as an owner-builder, you get to keep and enjoy the boat for as many years as you wish.

Substantial Cost Savings

Building your catamaran will work out cheaper than buying a new or even gently used boat. Though you will likely require some additional labor since doing some things will require an extra pair of hands, if you are particularly good at DIY, you will save a significant amount of money on labor costs as a whole. 

Freedom To Create Your Own Designs

If you decide to buy a catamaran boat, it might not be easy to find one that meets your unique needs. However, instead of choosing from production boats that bear traditional and outdated designs, you can come up with an ultra-modern design or style for your catamaran. You also get to pick your layout, size, and equipment based on your taste and budget.

Great Learning Experience

Building your own boat will help you pick up numerous skills that will come in handy later when sailing your boat. As much as you might still require an expert to help you with specialized skills like carpentry or wiring, your new skills will serve you well. This will also be beneficial when it comes to your boat’s maintenance and fixing things for yourself. 

What To Look For in Catamaran Boat Designs

When deciding on the type of catamaran boat to build, you may want to choose a design that’s simple and easy to build. This is because doing so will allow you to spend a shorter time building the boat. 

You also need to have a set of requirements to guide you in choosing your design or what you might call an ideal cruising catamaran wish list. This is essential because, ultimately, you want to build a boat that offers outstanding qualities such as:

  • Delivers good speed
  • Affordable to own and operate
  • Agile, strong, and easy to maintain
  • Has a high resistance to capsizing
  • Great for sailing and cruising
  • Delivers a comfortable and easy motion underway
  • Good handling ability and high performance under sail
  • User-friendly embarking and disembarking
  • Provides ample living and accommodation space 
  • Presents a reasonable resale value

It’s worth noting that, in general, catamaran boats tend to offer a fair resale value mainly because of scarcity and the high price accorded to production models. So, if you build a well-constructed catamaran, you are bound to get a return that’s much higher than the cost of materials upon resale.

It’s also good to consider whether the design you settle on is from an established designer. This is significant because documentation of the building process is just as valuable when it comes to selling the boat.

How Much Would It Cost To Build Your Own Catamaran?

The cost of building your cruising catamaran will depend heavily on the size of the boat you plan to build and the skills you bring to the table. To give you an idea of probable costs, a professionally built 40 foot (12.1 m) long cruising catamaran could go for up to $300,000. 

Though building it yourself will undoubtedly be cheaper, most DIY boatbuilders tend to underestimate the expected costs. Your final costs should cover not only the cost of material and equipment but also the labor and time it would take to come up with the final product. 

If you were to build a 40-foot (12.1-meter) catamaran, your cost of materials would range between 20-30% of the total cost. Therefore, for $300,000 total, the boat’s materials would range between $60,000 and $90,000. The hull tends to range between 15-35% of the total build. Again, this depends on the finish and furniture.

But before you even start working on the DIY project, you will need to figure out where to do the work. If your home has ample space, then you can opt for a backyard building. But if you live in a small apartment, then you might want to consider renting a small garage at first and then move on to a boatyard later. This is one of the significant costs involved in building your multi-haul.  

What You Will Need

To get a clearer picture of how much the entire project would cost, let’s have a look at what else you will need to purchase.

  • Good design plans
  • Working space
  • Ground tackle
  • Matting and roving
  • Equipment such as the engine, windows, rudders, deck fittings, mast, and rigging

In addition to the above, you also need to install plumbing and electricals. You may also want to consider going electric rather than using diesel. Not only will this drastically reduce your maintenance costs, but you get to use the regenerated power for all of your housing needs while sailing. 

Some catamaran boat designs help you save costs by advocating the use of less expensive corpus materials. Most of the material goes directly into making the boat, which means there is hardly any wastage on vacuum bagging . With this method, there are few molds and temporal building forms and fewer fillers to grind off as waste. All these factors reduce the time and cost it takes to build your catamaran boat.

That said, building a boat of any kind is a huge financial undertaking. As such, you still need to have the financial ability to keep building; otherwise, your project will stall or take much longer than anticipated. Instead of enjoying yourself and making memories cruising to faraway lands, you might end up spending all your time building a seemingly never-ending boat.

To reiterate, this project is more of a labor of love, given that it involves a tremendous amount of manual work. Calculating an hourly rate on the time spent building the boat and adding this cost to that of materials may make it seem a very pricey exercise. However, it is vital to understand that your time matters, and every hour you spend working for “free” should be included. 

With that in mind, you need to ensure that you are fully devoted to the boat construction project and are sure you want to do it before you begin. Stopping halfway because it seems like too much work would be incredibly costly.

How To Build a Catamaran

When it comes to building a cruising catamaran, you have 3 main options:

  • You can buy an old boat and refurbish it.
  • Purchase a bare hull plus deck molding for a home-boat building.
  • Start from scratch and build everything, including the hull, on your own. 

As mentioned above, renovating an existing boat may end up being more costly than starting from scratch. To build a catamaran boat from scratch, follow the below step-by-step guide.

Prepare the Essentials

Before you jump into such a large project, there are several important aspects to consider:

  • Buy your plans from an established catamaran designer. You can also get inexpensive, easy-to-build catamaran designs online.
  • Get access to a large working space or build a shed . Depending on your climate, you may need to opt for climate control to avoid an excess of moisture in humid areas. 
  • Decide on your choice of hull material. This could be fiberglass, aluminum, steel, wood, or ferroconcrete. 
  • Start working on a bill of materials estimate. Include everything that you think you need to get a better idea of the initial costs.

Build the Mast Beam

Using wood and epoxy, cut and glue together the pieces of wood that will form the mast beam. Most of the work at this stage can occur in a garage since it involves building small parts. Still, the work could take up to 4 months, so be prepared to put in long hours.

Build the Boat Hull

Now, it’s time to build the boat’s hull. A catamaran comprises two hulls which are connected with a deck. Below is a short video showing how to build a hull mold:

This work requires a larger facility, so you might need to move out of the garage and into a boatyard. If you don’t have access to a larger workshop, consider building a shed where you can work as you do the construction. Make sure there’s enough room to fit the boat and also allow you to work comfortably. To cover the shed, you can use opaque white tarps. 

Sheathe the Hull

Get all the materials you require for this stage in the construction, such as lots of resin, fiberglass, and foam for use in the hull cores. You’ll also require matting and glass roving to sheath the hull . 

Sheathing helps to make the hull impervious to water and other marine borers. But first, you need to prepare the hull using a rotary sander. To make it as smooth as possible, use light, sweeping strokes. This is a very dusty task so be prepared to wear a facemask and safety goggles. 

Install the Bulkheads

Next is installing the plywood bulkheads . You might need to call in friends to help turn the hulls or use a crane. In this step, you will need to laminate the hull sides on the molded hull panels and bond them above the bulkheads. Ensure the bulkheads are snug and sealed in place.

Construct the Interior Structure

Over the next couple of months, the boat work will involve joining the hulls together with the beams that you had made back in the garage. Then, install the cuddy cabin, decks , and the cockpit . Soon the boat will start to take the shape of a catamaran.

Next, proceed to construct the major structural components such as stairs, hatches, mini-keels, and the interior. Then comes the work of fairing the boat, which is quite labor-intensive. 

Finally, it’s time to apply primer on the catamaran boat and start the paintwork. Before painting the boat, you will need to do additional sanding to finish off the two layers of primer as well as fill all the pinholes. Since it’s a large boat, the catamaran has lots of surface area; thus, the sanding could get extremely exhausting—mentally and physically—at this point.

The painting can take a while, too. The hulls are the easiest to paint, but the topsides, non-skid, as well as masking and prepping could seem never-ending. 

The final stretch involves working on the center bridge deck cabin and other final touches like installing the engines, electricals, and plumbing. This is also the time to fix the rudders, rigging, mast, windows, and deck fittings.

Launch Your Cruising Catamaran

After many months or years of hard work, your cruising catamaran is finally ready to test the waters. After lowering the boat into the water, check carefully in case there are leaks. If none, you can set up the sails and take your catamaran out for your first cruise. 

Below is a short video that takes you through the entire boat-building process:

If you don’t have deep pockets, don’t despair. It’s also possible to build an inexpensive catamaran boat, as shown in this post from the coastal passage .

The Pros of Building a Catamaran

Though it will be a costly endeavor, there are so many things to look forward to should you decide to build your own catamaran:

  • It can be lots of fun.
  • You get to have a new boat.
  • It’s an excellent hobby for DIY enthusiasts.
  • The effort is rewarding.
  • It offers a great learning experience.
  • You get the exact kind of boat you want.
  • You can alter building plans and tailor the boat to suit your specific needs.
  • It might be cheaper than buying a new boat.

The Cons of Building a Catamaran

Though there are a number of positive aspects to a DIY build, it is just as important to keep in mind that it won’t always be easy:

  • Maintenance costs can be quite high.
  • It’s both mentally and physically exhausting.
  • It might require some technical know-how.
  • It can take many months or even years to complete.
  • It requires a lot of commitment to finish the DIY project.
  • It might be challenging as well as expensive to get insurance.  
  • You will spend almost all your free time building the boat. 

DIY Cruising Catamaran Tips and Tricks

If you are new to boat building, it would be a good idea to build a small boat first. This would give you a good indication as to whether you’d enjoy tackling a more extensive project like building a catamaran. Again, if you are the handy type, fixing your own electronics could also save you a significant amount of money. 

Here are more tips and tricks to get the most out of your DIY cruising catamaran:

  • Lower your costs. Bring down your costs even further by sourcing for parts and supplies at marine surplus outlets, Craigslist, eBay, or wholesale suppliers. 
  • Enhance your resale value. Most home-built boats are not easy to sell since they tend to be too customized. To enhance your resale value, it’s advisable to work with a standard design from a well-established naval architect.
  • Follow the design instructions. Make sure to follow the designer’s instructions regarding the type of materials and tools to use during the build to avoid making costly mistakes.
  • Maintain your original budget. Avoid any additional customizations once you have started building the boat. Using good plans and sticking to them ensures that your budget doesn’t spiral out of control.

Final Thoughts

Building a catamaran is about more than saving money. It’s fun, exciting, fulfilling, and can be a great learning experience. While it might take many months of back-breaking work, comparative shopping and sourcing for materials will help you save a lot of money. Still, at the end of it all, you’ll have a beautiful catamaran boat, all ready for your first cruising adventure.

However, if you have neither the time nor the energy to build your own catamaran from scratch, refurbishing an existing hull might prove faster and easier. It also works out much cheaper than buying a new boat.

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

One thought on “ DIY Cruising Catamaran: Complete Building Guide ”

Hello, I am a French Quebecer who is original, imaginative, creative and who finds that all boats and catamarans have a huge flaw and a very big lack of logic. I would have a brand new concept…. I am sending this message to any catamaran creator – designer to make those who have the opportunity and the intelligence to want to know about my innovative idea which will finally upset the market much richer. An idea that will totally change the concept of sailing, navigation and save so much worry!! All I would ask for is a small percentage of each sale of the new product. To be able to make me produce one when I have enough!! It is certain that like that, you just want to tell me: come on Mr. Lessard give us your idea but do not take your word to help me in return! But, if you are the kind of man to have only one word and maybe have a proof of your good faith if the realization of the project would make it… I will be very happy!! Giving it to everyone wouldn’t bother me either…. all I would like is to be able to find flax fiber (too expensive carbon) to be able to try to make my catamaran myself. Because not rich! Have a nice day and looking forward to having a message!!

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Do-It-Yourself: Build your own A Class catamaran!

Added by damonAdmin on Apr 23, 2003 - 12:26 AM

Ever thought about building your own catamaran? Here's an illustrated guide to one sailors project building a beautiful A-Class catamaran out of plywood. A big thank you to the builder, Chris Williams, for letting me share his work with the rest of the beachcat sailors.

A skill, known in boat building as lofting, the skins which will make the hull are cut out of the lengths of plywood. The front and rear bulkheads are also cut out along width the center board cases

 

A jig must be constucted to conform the hull to shape. The jig is a large 20ft long table with many structural members to give it strength against the pressure of the hull skins. The hole in the jig is shaped to the final shape of the top of the hull.

A setup involving laminated spruce blocks glued to the sides, gunwhales and bulkheads serves as an anchoring point for the crossbeams.

The foam spacers are glued in place with epoxy with filler added.

Epoxy on decks using staples and packing strips for pressure.

Route and Plane off excess.

Cut centerboard slots, fiberglass front gunwhale.

Use ridiculous amount of filler (don't breath the stuff), epoxy, and sanding to get dynamite finish

Saturate boat with 3 coats epoxy.

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  • Jul 25, 2012 - 06:16 AM
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Schionning Designs International Pty Ltd Leaders in Multihull Design and Kit Development.

The Kit Process

Building your own boat can be a daunting prospect, however to demonstrate each step in the kit assembly process, we've created this guide for you to study. as you can see our kits are the ultimate in building efficiency and have been streamlined over 30+ years to ensure that you're on the water faster and with less effort., how does it all go together.

Schionning Designs Catamaran Kit Build Process - Step 1 The first step to building your dream catamaran begins with a strongback - this is a square frame used to position the temporary frames that will be used to form the hull shape. This frame will be set up and must be square and accurate, a string or laser level can be used to achieve this.

The first step to building your dream catamaran begins with a strongback – this is a square frame used to position the temporary frames that will be used to form the hull shape. This frame will be set up and must be square and accurate, a string or laser level can be used to achieve this.

Step 2 pre-cut frame panels are erected along the strongback in sequence - catamaran building step 2 SDI

The forebeam is now installed along with the striker attachment fitting, as shown above. The bridgedeck is installed shortly after and taped onto the bulkheads with webs installed, this now completes what is a quite stiff and strong platform to work on.

Step 8 catamaran kit building - forward webs and dash will be fitted - SDI

Now that the bridgedeck is in place, the forward webs and dash will be fitted. At this stage, all furniture and internal work begins, with the main panels left off for ease of access when working.

Catamaran Kit Building Processs by Schionning Designs SDI -Step 9 The internal furniture is now installed, if you chose Kit Option 2, this furniture will be pre-cut to your previously decided upon layout. If you chose to receive blank panels, this is the period in which your internal living areas are to be built. This construction uses paper-honeycomb Duflex panels, as these are superior in weight when used non-structurally. Cabin soles, engines and daggerboard cases are also now installed.

has generously sent this article from an old Scientific American.  Click for more about Craig.

By PADDLEFAST.


Scientific American
Supplement, 1878.

IN the following are full particulars and dimensions how to build a fast, safe, and cheap boat, of the plainest make, or a lighter and more elegant one, as desired, from 25 to 30 feet in length. Technical skill is not necessary, as there is no bending of ribs nor fitting of planks.

A 25 FT. PLAIN CATAMARAN.

The only successful principles in the construction of the catamaran are extremely sharp hulls, and all possible lightness. Hence it is not surprising that a length less than 25 feet is not advisable for these boats, and that the catamaran about to be described will not carry more than two passengers, without detriment to speed and safety. The speed of this boat, under favorable circumstances, is about 14 miles per hour. The approximate cost of materials is $60. This boat can be used to advantage only in well protected waters. The two hulls are precisely alike, and much time will be saved by duplicating every stick and board as it enters the hull first built, and laying them systematically away for the construction of the other. The entire craft is constructed of pine, except the "aprons." The keel of each hull is of the rocker kind, i.e., curving upward at each end, like the bottom of a surf boat. Placing the keel, about 25 feet long, 2 inches thick, and 5.5 inches deep, in proper position, with an upward curvature of 1 foot, we set uprights at both ends, to temporarily represent stem and stern, which are both to be near the vertical. Next, a pair of thin strips, or combination of strips, are tacked to bow and stern and made to describe the curves of the hulls shown in Fig. 4 . There are to be 17 frames in the boat, about 16 inches apart. The curve of the strips should be regulated, so that the deadflat, or widest part, is at the seventh frame from the bow. This should also be the lowest point of the keel. The beam between the strips at deadflat is 36 inches. The vertical height from bottom to keel at deadflat to upper edges of strips should be 35 inches. At about a yard from both ends of the boat, the strips may be slightly pressed apart to make a better curve. The sheer given to the strips should not be more than 4 inches.   Fig1   Fig. 1 gives the deadflat section of the boat. The ribs B are perfectly straight, and are nailed directly to the keel A, one a little forward of the other, so that one rib is secured against the aft side of the deck beam C, and the other rib on the forward side. Now, by placing a stick in the position of B, the lower end against the keel, the upper end against the gunwale strips, and shifting this stick both forward and aft, we can mark out just how much is to be beveled off the lower edges of the keel. By the aid of the strips it will not be difficult to determine the shapes of all the bow and stern pieces, which will be put together as previously described in SUPPLEMENT 30.  fig2 Fig. 2 shows a section of the boat near bow or stern, wherein the keel fails to afford sufficient nailing room for the ribs B. In this case, however, the bow or stern deadwood, A', is extended to nearly a third of the boat's length to afford a good backing for the ribs. The temporary framework may now be taken down, the lower edges of the keel properly planed off, and the bow and stern pieces shaped. From this point the builder has no difficulty in replacing the keel in position, setting up bow and stern pieces, which are very much alike, consisting of stem or stern piece, apron (of oak), and deadwood, constructing the deadflat frame, Fig. 1 , and the other frames in turn, being guided, as before, by the gunwale strips. As the frames are made they are connected by the diagonal braces B', Figs.1 and 3 , the latter being a side view of boat, the vertical lines representing the frames. fig3 The deck beams C, to which the crossbeams D are to be bolted, should be about 1.75 x 3 in., the other deck beams may be 1 x 3, or less. The ribs A should be 1 x 2 in. After nailing on the deck, composed of 5/8 inch strips, 2 inches wide, and inserting the bolts intended to secure the hull to the cross beams D, Fig. 1 , the boat is planked up outside with 7/8 stuff, caulked and pointed. It must not be forgotten to provide a hatch in each deck, as is shown in Fig. 4 , large enough to bale from. fig4

Click here for larger GIF.   

The hulls, when thus far completed, are set perfectly parallel, 11 feet apart from keel to keel. Then to frames 1, 7, 8, 10, and 13, counting from the bows, where the bolts have already been provided, are bolted the five crossbeams D, 2x6 in., shown in Fig. 4 . On the crossbeams are set edgewise the diagonal pieces E, 1.5x6 or 2x5 in., with end piece E' extending from hull to hull. The space thus enclosed is floored over with 1/8 in. matched stuff, after securing the supplementary floor beams F, 2x2 in., to the pieces E. The mast G is stepped midway between the second and third crossbeams, and surrounded by three heavy blocks about 8 inches high, which enclose the end of bowsprit also. The port and starboard blocks are connected by two horizontal bolts, one abaft the mast, passing through the end block there, and one forward of the mast, crossing just over the bowsprit. The two side blocks are bolted to the crossbeams beneath, also. The bowsprit H is secured to the first cross beams by the iron strap H'. The bobstays I are attached to the cutwaters at the waterline. The mast is supported wholly by the jib stay and the shrouds I'. The shrouds are carried well back to obtain a firm spread, consequently they are attached to the hulls by blocks and running lines operated from the deck, so that either shroud may be loosed when necessary, to afford sufficient swing to the boom. The tiller J is about 3.25 feet long forward of the pivot, and about twenty inches aft the pivot. The port rudder is several inches higher than the deck, to afford nailing room for the lever L. There is the usual traveler on the stern piece E' with double blocks, as shown. The best jib is that used on the "John Gilpin" and the "Tarantella," SUPPLEMENT No. 105. The jib-boom projects about 18 inches beyond the end of the bowsprit, to which it is attached by a swivel. The jib stay runs to the end of the boom, but is quite independent of the jib. The jib, instead of sliding up the stay with hoops, is simply hoisted by the halyard with double blocks, and hauled taut. The end of the peak halyard is attached to the gaff well up toward the peak; the halyard is then run through a double block at the mast head, then through a single block on the gaff, again through the double masthead block, thence to the deck. The stays and shrouds should be wire rope 3/8 in. diameter. The anchor should weigh 30 lbs. The mast should be tapered considerably from the middle downward. The foot needs but very little more diameter than the head. We will again run over the principal dimensions: TABLE I Length of hulls over all 25 ft. Beam on deck 3 " Draft 17 in. Height out of water, at X 18 " Distance of hulls apart, center to center 11 ft. Length of boom 23 " Length of bowsprit 16 ft. 9 in. Length of jib-boom 18 ft. Hoist of mainsail 16 " Diameter of mast and main boom 5-1/4 in. Diameter of bowsprit 5 "

  

Front view.

Joint at heel of bowsprit.

8: End of L to deck beam.

9: Aft support E' to crossbeam.

 

This boat, like the previous, is not expected to carry a much greater weight than two persons. The maximum speed will, doubtless, be 18 miles per hour, as that rate has been reached by the "Amaryllis," a catamaran 5 feet shorter, but of lighter construction.

The cost of materials, including sail cloth and rigging, will be about $80.

The hulls are made just as before, save that the length over all is to be 30 feet, and the height out of water, 12 inches, instead of 18 inches, or, in other words, the vertical depth at the deadflat frame, from the upper edge of the deck-beam to the lower edge of the keel, is 29 inches. The beam on deck is thus reduced to 30 inches. The frames are still 16 inches apart.

As our isometric scale drawing, , shows, the boat consists of two low hulls connected by crossbeams at intervals, and a passenger deck or car swung midway between the hulls at a higher level than the decks of the latter. This car consists mainly of the sides E, 1.5x6 in., to which the 7/8 in. flooring is nailed. The flooring is strengthened by the middle piece F, beneath, 1.5x6 in. The car is supported at the stern end by the vertical pieces E', which rest upon the rearmost cross beams.

shows a good method of bolting E' to the cross beams. The car at the bow end hangs from the junction of the pieces L, which serve somewhat the purpose of shears.

As represents, the shear-pieces L are attached to the rear end of the bowsprit H, by a joint that allows free vertical play. The bowsprit is squared for about 4 inches at the end, and bound by two iron straps carrying rings to which the pieces L are hinged. The forward of these two straps also binds the pendant piece R securely to the bowsprit. This latter is firmly nailed to the end piece of the car on the outside, and a narrow portion of R continues down and is secured to the middle piece F, as shows.

The first cross beams D is bolted to the second frame from the bow. The shears L come over the eighth frame from the bow; the second cross beams D over the ninth frame; the deadflat and the mast also are at the ninth frame. The third cross beams comes over the eleventh frame; the backstay I'' is attached to the thirteenth frame, and the fourth cross beam is at the nineteenth frame. The car overhangs the fourth cross beam by about 2 feet 6 inches.

When cruising, the sail may be furled at night, the boom supported at convenient height by the throat halyard and a crutch, and a piece of canvas thrown over the boom and attached to the sides of the car, making a snug tent.

TABLE II

Dimensions.

Length of hulls overall 30 ft.
Beam on deck 30 in.
Depth at deadflat 29 "
Draft at deadflat 17 "
Sheer or rise of keel 12 "
Frames apart 16 "
Beam from center to center of hulls 13 ft.
Shear pieces, L 3x3 in.
Crossbeams, D 1.5x6 "
Middle piece, F 1.5x6 "
Side pieces E 1.5x6 "
Diameter of bowsprit 5.25 "
Diameter of mast and boom 5.75 "
Length of bowsprit 21 ft. 6 in.  
Length of boom 30 ft. 4 in.  
Hoist of mainsail 19 ft. 3 in.  
Weight of anchor 34 lbs.  
A BETTER FORM OF CATAMARAN. may be built by attaching the deck beams, car, etc., of the preceding boat to full-modeled hulls, i.e., hulls of curved cross-section thereby obtaining a handsomer and faster boat. This involves an increase in cost of materials of about $15. The principal dimensions would be the same. The best form of section of hulls for speed has been determined by numerous experiments, and persons desirous of building a full-modeled catamaran may obtain a "body plan" from the writer at reasonable price.
O'Donnell 
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Catamaran Construction – Hulls, Laminates, and Composites

  • Post author By BJ Porter
  • Post date October 15, 2020
  • 4 Comments on Catamaran Construction – Hulls, Laminates, and Composites

fabrication d'un catamaran

It’s a given that catamarans are more sensitive to weight and loading than monohulls. Catamaran builders strive to build the lightest boats they can without sacrificing strength and stiffness, and have adapted new building techniques and materials to meet this target. Cutting weight allows more passengers and gear without sacrificing performance.

And the marketing materials reflect it–they load every review and website with polysyllabic technical jargon describing the design and production choices each builder made to deliver the best boat they can.

fabrication d'un catamaran

But when you’re reading a brochure and you come across phrases like “ hand laid bidirectional GRP ” or “ vacuumed bagged e-glass with vinylester resin over a Divinycell core ” do you know what that really means?

All modern production catamarans are made with “FRP” construction (for Fiber Reinforced Polymer). Composites aren’t new–it’s just using materials together to strengthen the whole assembly. Straw was added to bricks centuries ago, and steel reinforced concrete is a staple of construction over the last century. For boats, it’s the use of stranded fibers and cured resins which make FRP different.

The term “FRP” doesn’t get into the technical detail of which fibers and which plastics, and how they’re put together to build your hull. There’s a wide variety of fiber types which can be stranded, woven, chopped or sprayed in a varied of patterns then combined with several types of resins to make hulls with different characteristics.

Some FRP techniques produce lighter, stronger shapes, while others are quicker to build and less expensive to produce. The choice of technique is a function of many factors, from the number of hulls and parts to be built, the type of parts, the budget for the project, and many design specific requirements for weight and strength.

1. FRP Basics

The principle behind all FRP construction is the same – you lay our fibers in the shape you need, then saturate them with resin, removing all the air and voids you can. Resin is left to cure, then the piece is ready to finish and use.

fabrication d'un catamaran

The reality is more complex, since building a boat isn’t like making a flat board or a simple door. You’ve got a complex shape with a designed set of curves to build. “Tooling” is the set of shapes to make the boat parts; molds to cover with fiberglass to get the right shapes.

That’s what makes FRP so effective – you can make almost anything out of it. But to do so requires a lot of choices about what you need for the project at hand.

There isn’t a “best” all around material or technique choice for all jobs, and sometimes a lower cost technique or easier to work with material may be the better solution to the problem.

A. Fiber types

Fiber choices in the last few decades have expanded past the glass fibers used in the first mass produced boats in the 1960s. FRP construction wasn’t new even then, they built the first composite boats using modern fiberglass in the 1940s.

The major fibers used in marine construction fall into three categories – glass, aramids, and carbon. The primary differences are in the strength to weight ratios of the fibers, durability, elasticity, and cost. Some construction may use blends of fiber types to combine performance characteristics.

Glass – the most common material still, because of its low cost and versatility. The most common variety used in GRP (Glass Reinforced Polymer) is “E-glass” which refers to its strand size and mineral content. Other grades have different and sometimes better mechanical properties, but may be more expensive and less appropriate for boat building use. Fiber sizes run 10 to 25 microns for E-glass, though other grades may be smaller.

fabrication d'un catamaran

Brands like Leopard, Lagoon, and most higher production volume builders use E-glass.

Aramids – this includes brand names like Kevlar, Technora and Twaron. They have higher tensile strength than E-glass, and resistant abrasion and punctures. Kevlar is a common choice for bullet proof body armor, and can built a tough, lightweight hull. The materials can be difficult to work with, as it is very tough to cut the cloth. It is often blended with carbon fiber or other materials – Catana is known for using Twaron blends in hull construction.

fabrication d'un catamaran

Carbon – the ultimate in lightweight, strong construction material. Carbon fiber is the most expensive fiber, and is available in a variety of weights, grades and strengths. Fibers are smaller than glass – down to 5 Micron.

The lightest, most expensive hulls are made from carbon, but a catamaran builder may use carbon in places other than the hull to add strength and stiffness. Carbon boards, rudders, and reinforcing structures can enhance performance without driving the price of the boat beyond reach. Carbon is the fiber of choice for many custom builds, racing cats, and Gunboat.

B. Mats, Strands, Roving, Direction, and Weights

Fibers are woven into matting and cloth for construction. Depending on the application, different weights of cloth and cloth patterns and weaves may be more appropriate for the job.

Cloth weight refers to the weight per square yard (or meter) of the cloth. A square yard of nine ounce cloth weighs nine ounces. The heavier the cloth, the stronger it is in a laminate.

Fibers carry loads along their length, so cloth weaves have directionality to their strength. Most builders use several layers of cloth with different orientations to give good universal strength to hulls. Specific FRP applications with strict load-path requirements may have more unidirectional fiber layering – for example, a chainplate manufactured from carbon fiber may use unidirectional fiber.

Cloth – fiberglass cloth is commonly used on outer layers of composites. Cloth may have unidirectional or bidirectional strength. Bidirectional cloths have maximum load strengths in two perpendicular directions. Variations on weaves like a modified twill allow a more flexible cloth for better shaping around complex molds.

Mat – is omnidirectional strands of fiber compressed into a cloth. This is often held together with a resin soluble glue, which makes mat great at conforming to mold shapes without folding and bunching as it collapses when wetted. Because the strands do not align, fiber strength is the same in all directions.

fabrication d'un catamaran

Woven Roving – a heavier cloth made from larger bundles of strands. Woven roving allows for quicker buildup of material and strand weight.

Most FRP layups include multiple layers of different cloth and mat. Finished layers may be finer cloth over courser cloth, over woven roving and mat.

Three primary resins are in common use in marine construction – polyester , vinylester , and epoxy . All resins have materials safety concerns and require care in their use and handling.

Polyester is the least expensive and requires breathing protection because of the VOC emission (Volatile Organic Compounds…nasty, smelly fumes). It doesn’t have good bonding/gluing capability, and should only be used with glass fibers for structural building. Some polyester resins are referred to as “isophthalic” resins.

Vinylester is chemically similar to a hybrid of polyester and epoxy, and performs best with fiberglass. It shouldn’t be used in high strength applications with carbon or aramid fibers. It has some adhesive qualities which polyester lacks, it shrinks less during curing, and has better impact resistance.

The added strength of vinylester coupled with increased water resistance makes it an attractive option for many catamaran builders. It costs less than epoxy, but still has better performance than polyester.

Epoxy is the most expensive, but is three times the strength of the others. It offers the best adhesion and the only resin for building structural elements with carbon and aramid. It resists water intrusion better than the other resins, resists blisters, emits no VOCs, and shrinks less. The major drawback is it is more brittle if it takes an impact.

While epoxy is “the best” in terms of strength and ease of building, there are many applications where other resins are appropriate. Budget is a big driver – a boat made from E-Glass doesn’t need epoxy resin, and considerable cost savings to meet a construction price target may drive the choice.

They can build quality boats from all material combinations, but price and performance will drive materials choices to keep some boats more affordable.

2. Cored Construction

What’s the best way to make fiberglass strong? To a point, you can make it thicker. As it gets thicker, it gets heavier. A hollow shape can take more compressive load than a solid one of the same weight, and the same principle applies to fiberglass construction.

Consider an I-Beam used in building construction. It has the same strength (or more) as a solid rectangular beam of similar mass. The compressive load on the beam is supported by the outside edges of the material, the metal in the middle doesn’t contribute much to the strength. So we can remove metal to get the “I” shape while still keeping those sides rigid, making a lighter girder with less material.

The same principle applies to cored construction with fiberglass. Making a sandwich of two layers of fiberglass with a light core between them allows for the greater strength with weight savings.

There are drawbacks – the biggest risk is damage which breaks the skin, which can let water into the core. Earlier cored construction used materials prone to saturation and rot if they got wet. Some builders opt to do cored construction above the waterline and solid below to minimize some of these risks.

But the advantages in weight savings and increased stiffness offset the drawbacks, and there may be a few other side effects like sound and temperature insulation. Like resins and fibers, core materials offer distinct advantages, disadvantages and price points.

Most builders have adopted a hybrid approach, building solid hulls below the waterline, and cored hulls and decks above. This gives a balance of weight and safety.

A. Balsa Core

Balsa is light and inexpensive. The first cored construction used balsa, but it has the disadvantage of being wood. As a natural material, if it gets wet it can rot and break down. Builders use “end grain” balsa – shorter cross cut sections – to prevent wicking of water if there is an intrusion.

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B. Foam Core

Closed cell foam cores give good strength to weight savings while minimizing water intrusion. If you get water in the core, it won’t spread very far. Divinycell is a popular PVC foam core, though there are several choices with different densities and compressive strengths.

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Some foam cores are not suitable for heat treatment, but infused or vacuum bagged boats like the Outremer and PDQ do well with it.

C. Honeycomb

Honeycomb cores are often the most expensive, but also give some of the best strength to weight ratios. Honeycombed cells made from resin cured aramid papers are some of the best, but also among the most costly. They offer good stiffness, but can be hard to shape. Aluminum and other resin-infused papers are other core materials builders can choose from.

3. Construction and Resin

When building a hull, there are optimal ratios of fiber to resin saturation for target strength and weight. Too little resin and you may not have enough strength (or worse, voids and gaps), and too much, and you’re just adding weight without adding strength. Resins are also a significant material cost in building the boat, so over application not only increases weight but adds cost.

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There are many ways to assemble the cores, fibers and resins to build a finished laminate hull – we’re addressing the most common in boat building. Each approach has strengths and limitations, and an impact on the bottom-line cost to build the boat. Any voids or air pockets in the laminate can be disastrous; these techniques have been developed to increase saturation and reduce the risk of voids.

A. Hand Layup / Open Molding

As the name implies, this is the application of resin by hand to cloth as it’s laid into a mold. Wetting is done with a brush, and the laminate is rolled out to remove any air pockets and voids. This is the simplest way to lay up fiberglass, but also the least precise and consistent and will use the most resin.

Skilled craftsmen have built some of the finest vessels in the world this way. Though it’s more popular with monohulls, which are less sensitive to weight, many catamarans built with hand layups on open molds are still out cruising and performing well.

B. Spraying

Using chopped-strand fiber mixed with resin, a “chopper gun” can spray the mixture into a mold to lay down the composite. A consistent thickness can be difficult, but this is a low cost construction technique which makes a very resin-rich laminate. Using sprayed fibers gives lower strength in all directions compared to meticulously laid down mat and bi-directional cloth. But it is a quick technique popular with mass produced, smaller boats.

It is an excellent technique for parts with complex geometry where weight is not an issue, but you will not see it often in catamaran construction. It’s heavy with resin without any resultant increase in strength.

C. Vacuum Bagging (Wet layup)

When an open molded component has been laid up and wetted with resin, vacuum bagging takes the process a step further. After the wetting is complete, air tight plastic bagging is secured around the wetted area, and the air is pumped out of the bag. The vacuum pulls excess resin out and collapses air pockets.

fabrication d'un catamaran

The goal is to get thorough wetting and produce as strong a laminate as possible without excess resin. Knysa and Leopard are two builders that use vacuum bagging on their hulls to reduce weight.

D. Resin Infusion

For resin infusion the cloth, matting and core is laid in place dry, then sealed in an air-tight bag. A vacuum pump attaches to one side of the bag, and on the other a feed for resin. The vacuum sucks the air out of the dry cloth stack, then pulls the resin through the stack, infusing and wetting it.

Resin infusion, when done right, gives the lightest, strongest laminates with no voids and the minimum resin weight for maximum strength. SCRIMP is a variant of the resin infusion process used by some builders, including TPI which build many early Lagoon cats.

E. Pre-preg

Using pre-preg (for “Pre Impregnated”) cloth for your laminating gets rid of the resin bucket. They manufacture cloth with a partially catalyzed resin pressed into it, then it’s chilled or frozen to stop the curing process. There is no need for seperately mixed resins, and there’s no worry your resin might “go off” and harden before you’re done wetting the cloth. Instead, the cloth is assembled, vacuumed, then heated to kick off the curing process.

There are both advantages and disadvantages to using pre-preg for your laminate work. The big disadvantage is the cost; it is most expensive material to use. You also need to chill and store the cloth until you need it, though some can be at room temperature for a couple of weeks without kicking off. And you need an oven which requires some clever tricks if you’re building a forty or fifty foot boat.

But the strength to weight ratio will always be perfect. High tech honeycomb cores are best suited to pre-preg lamination, and without racing against resin cure times, you can ensure perfect cloth placement and precise layout in the build process.

The primary use for pre-preg in boating is high performance race boats. With catamarans, pre-preg may be used high load parts, like Gunboat does for foils and rudders.

4. Industry Examples

Across the catamaran building industry you’ll find almost all the above techniques and materials used, though some are less common. You aren’t likely to find chopped strand sprayed layups in ocean going cats, and hand layups can lead to heavier hulls than weight sensitive catamaran designers prefer. Most manufacturers have moved to vacuum bagging or resin infusion, with a few of the highest end boats using pre-preg for key components.

Built by Robertson & Caine in South Africa, the hull material is vacuum bagged, end-grain balsa-cored E-glass with polyester.

Hand laid, bagged vinylester over an Airex foam core in the hulls.

Earlier Prout catamarans like the Snowgoose 34 featured hand laid solid FRP hulls and decks. Over time they switched to foam or balsa cores for decks and above the waterline.

Older PDQ boats were made from vacuum bagged vinylester – solid below the waterline and cored with CoreCell foam above the waterline and in decks. Newer PDQ models switched to epoxy resin.

All glass is vacuum bagged. Below the waterline is solid E-glass and vinylester. The rest is unidirectional, bidirectional, and triaxial cloths over a Nida-Core polypropylene honeycomb core with isophthalic and vinylester resins.

The Gemini cats are built with a solid hand layup of woven roving and fiberglass mat and polyester resin. Decks are cored with end grain balsa. The Gemini 3200 introduced vinylester resin into the layup to prevent blistering.

Older Lagoons were SCRIMP infused vinylester with and end grain balsa core above the waterline and in the decks.

Newer Lagoon catamarans use polyester and vinylester resins, also infused with balsa cores above the waterline and solid below.

With a carbon fiber inner skin, Catana also uses Twaron aramid fibers in the sandwiched hull over a foam core.

Fontaine Pajot

Primary hull construction is resin-infused vinylester with a balsa cored hull and deck.

Beneath the waterline, Outremer uses a single layer, solid vinylester laminate for safety. The hulls and deck are vinylester with a Divinycell foam core. They stiffen certain components with carbon for rigidity and durability.

Gunboat hulls are epoxy infused carbon fiber with a Nomex honeycomb core. They build dagger boards and other high load components with pre-preg carbon.

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BJ Porter

By BJ Porter

Owner of Hallberg Rassy 53; world explorer.

4 replies on “Catamaran Construction – Hulls, Laminates, and Composites”

Excelent. Thank you for this I learned allot. Johan

Very straight forward information. Thankyou for doing this.

Damn…What an Amazingly Informative Article. *Cheers*

Outremer publish on their website that they use polyester. Not vinyl ester as you have stated.

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Pour le chantier Outremer, la conception d’un bateau part d’un cahier des charges exigeant. De sa cohérence découle le dessin de l’architecte, qui travaille en étroite collaboration avec les designers et les ingénieurs pour obtenir un résultat harmonieux.

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Sécurité, fiabilité, performances, confort et plaisir sont les maîtres mots tout au long de la conception d’un Outremer.

Naviguer sereinement en toutes circonstances.

Priorité absolue pour tous les marins ! On peut accepter en course des risques en toute connaissance de cause mais en voyage, une marge de sécurité très importante est fondamentale. Ainsi les dérives sont indispensables pour garantir une bonne remontée au vent, même dans des configurations difficiles. On ne choisit pas toujours les situations que l’on va rencontrer : Outremer vous emmène à bon port, dans toutes les conditions.

Résister à l’épreuve du temps et s’améliorer en continue

Chaque Outremer parcourra sans doute plusieurs centaines de milliers de milles au cours de son existence et il est crucial que chaque système soit éprouvé et fiable. Pour cela, le chantier Outremer apporte un soin particulier à ses finitions, par ses choix technologiques et la sélection des marques des équipements qu’il installe sur ses voiliers. De plus, nous réalisons chaque année une enquête auprès de tous les nouveaux propriétaires pour améliorer constamment nos catamarans. Ce retour d’expérience est précieux : il permet de tendre vers le « perfect boat » !

Allier confort et plaisir de naviguer

Les modèles du chantier Outremer ne sont bien sûr pas des voiliers de course, mais ils sont parmi les plus rapides des bateaux de croisière ! La performance est à la fois une source de plaisir pour tout marin mais aussi un élément essentiel de sécurité permettant de disposer de plus d’options face aux aléas de la météo.

Une qualité de vie à bord incomparable

Une des clés du succès de la croisière ! La qualité de vie à bord dépend essentiellement du confort en mer. Tous les éléments sont réunis sur un Outremer pour profiter d’une qualité de vie incomparable : qualité du sommeil permise grâce aux mouvements plus doux, absence de chocs sous la nacelle, tangage réduit permettant aussi de cuisiner dans de bonnes conditions. Le silence à bord, l’absence de grincements ou craquements souvent constatés en catamaran, garantit une quiétude incomparable.

Rendre la navigation agréable et accessible à tous

Parce que le plaisir partagé de l’équipage est la garantie d’une vie à bord harmonieuse, le chantier Outremer prend en compte les besoins de tous, skipper, équipiers, enfants, passagers… Tous peuvent apprécier la visibilité sur 360 °, la parfaite ventilation, l’ergonomie totale. Et bien sûr le plaisir de la voile, de sentir un bateau qui marche vite et bien, illustré par les barres franches adoptées sur les modèles Outremer, atout incomparable pour percevoir sur un multicoque la glisse sans efforts !

Loïck Peyron, parrain du 4X : « l’intérêt du voyage en bateau, c’est le point de départ et la destination. Entre les deux, c’est une belle navigation bien sûr, mais c’est souvent trop long ! »

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Dessiner le bateau idéal : les architectes traduisent le cahier des charges en lignes et en volumes …

  • Carènes étudiées et optimisées, coques longues pour porter la charge nécessaire et réduire la résistance à l’avancement. Les coques fines demandent en effet peu de puissance pour faire route et permettent de tenir des moyennes élevées en navigation. Mais aussi de n’utiliser qu’un seul moteur quand il n’y a pas de vent, réduisant le bruit dans les coques quand une partie de l’équipage se repose et doublant ainsi l’autonomie.
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Méthodologie du chantier Outremer

Proposer un mélange de technologies high-tech et de savoir-faire. Les programmes de grande croisière imposent des marges de sécurité très importantes : il faut pouvoir compter sur son bateau en toutes circonstances !

Même si la philosophie du chantier est de gagner du poids, cela ne doit jamais se faire au détriment de la solidité et nos concepteurs s’attachent à renforcer les points essentiels : des étraves protégées par plusieurs crash-box étanches, des fonds de coques résistants aux chocs et au poinçonnement, des puits indestructibles puisque les dérives servent de fusibles, une insubmersibilité de fait.

Si les composites modernes tels les sandwichs sont incontournables par le gain de poids qu’ils permettent, un Outremer comporte toujours, des semelles de coques en stratifié monolithique de forte épaisseur : en cas de choc, aucune structure en sandwich ne peut rivaliser avec le fond de coque d’un Outremer. La structure est entièrement stratifiée sur la coque, et non pas simplement collée : il n’y a pas de contre-moule empêchant d’atteindre une quelconque partie des œuvres vives, car tous les systèmes sont visibles et accessibles.

La rigidité d’un Outremer est incomparable

Les cloisons principales très largement dimensionnées, peuvent encaisser des efforts bien supérieurs à ceux qu’un multicoque de croisière peut rencontrer. Des inserts en fibre de carbone, des mousses à cellules fermées, des résines iso phtaliques et polyester à haute résistance : tout est conçu pour garantir votre sécurité.

Pour les meubles, des panneaux en sandwich sont utilisés pour gagner du poids, avec des placages en bois pour la chaleur et l’esthétique. Les meubles ne participent pas à la rigidité et sont isolés des parties structurelles pour éviter les bruits intempestifs, les craquements, les grincements. Des structures en aluminium supportent les planchers, qui ne grincent pas non plus. Plus de portes bloquées ou de tiroirs qui ne ferment plus. Pour les équipements, nous choisissons des marques et des modèles pour leur qualité, leur fiabilité et leur adéquation avec le programme du bateau.

Un Outremer est conçu pour vivre plus de cinquante ans

Les propriétaires se succéderont au fil du temps, tous avec des projets ambitieux et voulant remplacer ou ajouter certains équipements ! Dans cette perspective, nous nous appliquons quatre règles d’or : chaque partie du bateau, chaque système installé doit être documenté, accessible, vérifiable et remplaçable.

À ce jour, plus de trois millions de milles ont été parcourus par les Outremer sur toutes les mers, la plupart sillonnant sans relâche les mers tropicales, même si beaucoup se sont frottés aux conditions extrêmes, de l’Alaska à la Patagonie. Cette immense expérience accumulée par Outremer a permis d’affiner et de conforter nos principes de construction.

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Pour le composite bois époxy

Alain Borsotti a fait ses classes chez Denis Kergomard au chantier de la Méridienne, il a ensuite construit les Etincelle 60’ au Brésil (J. Fioleau) avant de s’installer à Sète et de fonder Rives Sud. Spécialiste des multicoques, restaurateur et constructeur de talent (Fleury Michon IV, Pat’s), Alain maîtrise parfaitement tous les composites, mais avoue une préférence pour le bois époxy. La construction composite bois n’a cessé d’évoluer depuis 25 ans. A l’époque, je construisais mon premier catamaran (un Punch 1000 de Ph. Harlé), sorte de Muscadet à deux pattes, caisse en contreplaqué "westé" à la résine, stratifié seulement sous la flottaison et collé en joints congés. Il navigue toujours aux Caraïbes, en parfait état. Une autre alternative était le bois moulé : méthode magique (et longue !) pour fabriquer des multicoques tout en courbes, légers et résistants. Il m’aura fallu quatre ans pour reconstruire Fleury Michon 4, trimaran de 45 pieds dessiné par Dick Newick ! Cette méthode semble difficilement rentable de nos jours, car trop coûteuse. Dommage, car c’est le "nec plus ultra". La multiplicité des techniques composite bois permet d’optimiser devis de poids, contraintes mécaniques, exigences de confort et esthétique, à condition d’adopter le bon matériau au bon endroit. Le trawler à voile RS57 actuellement en construction au chantier regroupe les trois techniques principalement utilisées aujourd’hui. Le strip planking, héritier en droite ligne (ou en droit fil !) du bois moulé est idéal pour la réalisation des fonds de coques. Il est composé de lattes de red cedar (cèdre rouge, bois imputrescible de 20 à 30 mm d’épaisseur) collées ensemble puis recouvertes de tissu de verre biaxial imprégné de résine époxy. Raideur longitudinale et résistance aux chocs sont ainsi garanties. Le contreplaqué entre dans la construction des cloisons et des bordés. La découpe numérique permet aujourd’hui un gain de temps et une précision d’ajustage qui étaient inimaginables il y a une quinzaine d’années. Tous les éléments arrivent entièrement prédécoupés aux cotes grâce à un logiciel informatique couplé à une machine à commande numérique industrielle. Ces éléments sont ensuite assemblés au sol, tel un puzzle géant. Piges d’alignement et scarfs en escalier permettent un collage optimum des différents éléments. Les fonds de coques reçoivent ces éléments (varangues, cloisons et autres renforts), puis le tout est aligné au laser. La collaboration de trois personnes pendant deux semaines a suffi pour aligner l’ossature du RS57. Auparavant, les côtés extérieurs des bordés avaient été stratifiés sous vide sur un marbre, réduisant ainsi le travail de finition et de ponçage. L’intérieur est entièrement "westé" (imprégné de résine époxy) en trois couches, rendant impossible une reprise d’humidité dans le temps.

Multicoques match : bois époxy ou sandwich

Pour le pont et le rouf, la technique dérivée du sandwich, déjà bien connue, nous paraît la plus appropriée. Pour le RS57, nous avons adopté le principe suivant : couche supérieure (extérieure) en tissu de verre, âme en mousse PVC et couche intérieure en contreplaqué. Le CP en parement intérieur pourra recevoir sa laque de finition sans exiger un travail fastidieux de ponçage et enduisage. La mousse PVC garantit une excellente isolation thermique, et la stratification extérieure complète la rigidité de l’ensemble. Il y a 20 ou 30 ans, l’assemblage des différents éléments se faisait exclusivement avec des vis et des joints congés. C’était parfois leur point faible, par lesquels des infiltrations d’eau pouvaient se produire, ainsi qu’une faiblesse structurelle à l’usage. Désormais, toutes les pièces d’un multicoque moderne en composite bois sont stratifiées entre elles par des bandes de tissu, généralement biaxial. Des cloisons principales aux varangues et jusqu’à la moindre étagère, toutes les pièces participent à la structure de l’ensemble. Ceci explique le résultat : des châssis légers, d’une raideur incomparable. L’adjonction de fibre de carbone en petites quantités aux endroits stratégiques (cloisons de mât, poutres, appendices) permet d’améliorer encore les performances techniques. L’évolution des techniques du composite bois ces 30 dernières années, la variété d’usage et de formulations qu’elles offrent, en font une alternative tout à fait intéressante par rapport aux autres matériaux reconnus. Les principaux reproches que l’on pouvait adresser au bois il y a quelques décennies ne sont plus d’actualité. L’entretien extérieur est largement facilité par l’emploi systématique de tissu et résine époxy en revêtement extérieur sur l’ensemble du bateau. Ainsi, le bois est très bien protégé de l’humidité, et à part une peinture neuve tous les 10 ans, l’entretien n’est pas plus contraignant que pour n’importe quel autre matériau. L’entretien intérieur est, quant à lui, bien plus simple : pas de vaigrages, pas de meubles rapportés, une structure globale lisse et unifiée, qui facilite le nettoyage et une éventuelle rénovation. Enfin, grâce à l’alliage de matériaux comme les fibres de verre biaxiales, les fibres de carbone, à l’étanchéité de la résine époxy, à des contreplaqués relativement fins agencés entre eux et solidaires de manière à assurer une bonne solidité globale, on obtient au final des bateaux légers et résistants. Enfin, ce matériau reste parmi les plus écologiques pour la construction navale, la proportion de bois étant bien supérieure aux matériaux issus du pétrole, offrant un bilan carbone parmi les plus bas. Un argument de plus qui laisse à penser que le composite bois a aujourd’hui plus que jamais sa place dans la construction navale.

Multicoques match : bois époxy ou sandwich

Pour le sandwich

Derek Kelsall est un pionnier des multicoques (il est notamment un des principaux inventeurs du process sandwich). Coureur, constructeur, architecte de talent, il a signé les 3 fameux Three Legs of Mann de Nick Keig, ainsi que William Saurin, le premier des trimarans géants pour Eugène Riguidel. Aujourd’hui établi en Nouvelle-Zélande, Derek s’occupe du développement et de la promotion de sa technique de construction à l’unité, le KSS, en plus de ses activités de designer. J'ai toujours aimé travailler le bois, mais ajouter de la résine à chaque étape me semblait moins intéressant ! Pour un canoë par exemple, les lattes de bois peuvent donner un résultat remarquable, mais, si on cherche un maximum d'efficacité dans le temps de construction, le coût et le poids, il existe une technique supérieure à toutes les autres : le KSS sandwich. La mousse de PVC utilisée comme âme entre deux peaux de fibre de verre montre une souplesse d’emploi unique. Il n'y a presque aucune limite aux formes qui peuvent être mises en œuvre et nous découvrons toujours de nouvelles "ficelles du métier". Le contreplaqué et le bois moulé sont figés, l’usage de la mousse n’est limité que par l'imagination, comme un logiciel d'ordinateur régulièrement mis à jour.

Multicoques match : bois époxy ou sandwich

POURQUOI LE SANDWICH ? Quand j'ai construit mon premier trimaran au Texas, nous avons utilisé du mauvais contreplaqué, recouvert d'un matériau formidable : la fibre de verre ! Je me suis demandé pourquoi la fibre n'était utilisée que pour le revêtement, tant elle semblait robuste et dure. A l'époque, je ne connaissais rien au design ou à la construction des bateaux, mais mon bagage en ingénierie me montrait que la première exigence de la fabrication d'un bateau était la rigidité des panneaux, et que ce sont les différentes formes de sandwichs qui offrent la meilleure rigidité. Une structure sandwich est constituée d’une âme légère et de peaux fines, mais très résistantes. C'est le principe de la poutre IPN ; la rigidité est proportionnelle au carré de l'épaisseur ; si vous doublez l'épaisseur de l’âme, elle devient 4 fois supérieure avec un poids supplémentaire négligeable !

LES MATERIAUX Dès 1965, j'ai trouvé les bons matériaux en Grande-Bretagne, c'était l'époque où le polyester moulé devenait populaire. La société BTR Industries avait produit le Pasticell, une mousse PVC à damiers qui n'avait pas encore été utilisée sur des bateaux. Pendant quelques années, nous avons utilisé les méthodes traditionnelles, les plaques de mousse étaient fixées au moyen de vis sur des armatures en bois ; j’ai alors suggéré qu'un tissu de verre unidirectionnel serait plus approprié (chaque peau nécessitant au moins deux couches croisées). A l'époque, la résine de polyester était la plus répandue, et c'était celle que je connaissais le mieux. Aujourd'hui, on utilise plutôt la résine Vinylester, mais les spécifications de base n'ont pas changé. La technique traditionnelle encore utilisée pour produire des coques de monocoques en sandwich est fastidieuse (application de la peau extérieure, puis retournement pour appliquer la peau intérieure), elle implique également de longues heures d'enduit, de ponçage et de peinture. Pas avec le KSS, qui est une méthode complète et directe de fabrication de panneaux ! La plupart des constructeurs recherchent une belle finition, qui implique plusieurs passages d'enduit et le ponçage entre chaque couche. L'épaisseur des peaux de la plupart des multis est d’un ou deux millimètres. Pourtant, j'ai vu des enduits d'une épaisseur de 10 à 12 mm afin d’obtenir une finition "miroir" lors de l'application de la peinture ! L'enduit peut facilement doubler le poids de la peau ! En 1973, j'ai effectué un pas important en fabriquant une table de lamination de grande taille ; je me souviens encore du premier panneau produit avec belle finition brillante qui n'avait pas nécessité toutes ces étapes fatigantes ! Le process avait évolué en qualité et en gain de temps, donnant une meilleure ambiance dans l'atelier et suscitant l'enthousiasme des constructeurs. La possibilité de produire des panneaux de grandes tailles légèrement courbés aux lignes élégantes était assurée ! Travaillant et dessinant en même temps, je concevais mes bateaux pour que toutes les pièces puissent être fabriquées sur le marbre, en employant le vide pour assurer l'adhérence entre le cœur et la peau (le chauffage étant utilisé pour optimiser les qualités de la résine). KSS (Kelsall Swiftsure Sandwich) fut le nom suggéré par notre premier client propriétaire, nous l’avons adopté en 1990. Les clients se sont rapidement mis au KSS. Il n'y a aucune autre technique disponible pour produire des coques élégantes et légères en 3 ou 4 jours comme nous et nos clients le faisons régulièrement !

Multicoques match : bois époxy ou sandwich

LA VERSATILITE DE LA MOUSSE Quand la mousse est utilisée comme âme, elle montre des propriétés remarquables. J'aime la comparer à un bois très léger avec lequel on ne se préoccupe pas du sens de la fibre. Par exemple, les panneaux en courbe simple sont plats lors de leur fabrication (sans la deuxième peau), enlevez-les de la table, pliez pour trouver la forme désirée, et ajoutez la deuxième peau pour fixer la forme en utilisant l'élasticité de la mousse !

LES AVANTAGES DE LA TECHNIQUE SANDWICH KELSALL Moins de poids Réduction du temps de construction Meilleures finitions Lignes élégantes Atelier propre Finition moins onéreuse Assemblage modulaire Durabilité (des Kelsall de 45 ans passent des contrôles facilement !) Facile à réparer Bref, la plus satisfaisante des méthodes de construction ! C’est pourquoi le KSS est le process qui convient le mieux à la construction des bateaux à l’unité de toutes tailles. Son seul inconvénient: il ne peut pas être appliqué aux formes de bordés courbes (style coquille d’œuf) de certains designers, mais il reste possible de combiner la technique classique avec le travail sur table KSS.

Tags : 

  • Multicoques Match , 
  • préparation , 
  • construction amateur

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All the features of a big boat

The Excess 11 is the only large-scale production boat on the market for this size of catamaran. This...

DESIGNED FOR SAILING, CRAFTED FOR LIVING

The Excess concept corresponds to a certain idea of sailing: exalted, free, daring. The Excess 13 takes...

The pure incarnation of the Excess DNA

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Modern, technical and sporty

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TESTIMONIES OF PASSIONATE OWNERS Join the Excess tribe !

Hereiti and Manutea

"Customers love the aft helm position for the sensations, it's different from other catamarans! "

Hereiti and Manutea - EXCESS 11

Hinatea & Tristan

"In Tahiti, there are children who have never seen the sea, and we'd like to take them sailing. It's part of one of our projects with the Excess 11".

Hinatea & Tristan - EXCESS 11

Ned and Misala

"I like this boat because it's fun, it's fast and it also allows you to cruise, so it's a good mix between cruising and fast sailing."

Ned and Misala - EXCESS 11

Cathy and John B - Excess Campus

"You learn lots of things. And then meeting and sharing with the other owners... So far, it's been great!"

Cathy and John B - Excess Campus - EXCESS 14

Jeff B

"I found that sailing was both relaxing and stimulating, as well as a good escape from the stress of my profession. »

Jeff B - EXCESS 11

Hiroshi H

"What I’m going to say seems to be kind of ridiculous because I’ve just got a brand new Excess 15, but in my mind I have already started thinking about my next dream boat. In six years from now, when I become a seventy year old man – if I’m alive still – Excess 17, with the Torqeedo solution."

Hiroshi H - EXCESS 15

Tony & Heather

“When the Excess 14 first came out, it seemed almost perfect. The main advantages of this catamaran are its perfect size for two people, and its ease of sailing. With the boom being low, it’s easy to handle.”

Tony & Heather - EXCESS 14

Jeniffer and Cédric

“We loved the family atmosphere. Excess is like one great big family to us, and we're really glad to be part of it! They're always there to listen to us and advise us.”

Jeniffer and Cédric - EXCESS 14

Giovanni C

“I love both the profile and the “hybrid” concept, halfway between a traditional monohull and a very cruisey catamaran such as a Lagoon. It's comfortable and easy to sail, with no more water on deck... And ladies prefer a boat that doesn’t heel!”

Giovanni C - EXCESS 11

André G

“I've been seduced by the performance of the Excess range, and that’s really why I've just bought an Excess 14, which for me is the ideal compromise. For me, with my sailing experience, it’s interior space and habitability, it meets all my expectations!”

André G - EXCESS 11

Marco and Lizzy

“We spent exactly 365 days onboard of our Excess 11 in both the Mediterranean and the Caribbean and loved the combination of comfort and sailing performance. We never imagined that taking showers or cooking while crossing an ocean would be so much fun!”

Marco and Lizzy - EXCESS 11

Marion and Arthur

“In our opinion, this is the perfect compromise between comfort under way and at anchor, and great sailing sensations with performance that frequently impresses us! It sails very well upwind as well as in light airs. From 7 knots of apparent wind, we move faster under sail than under motor. We don't regret our choice one bit, and enjoy every day spent on board our Silène.”

Marion and Arthur - EXCESS 11

Franck D

" - About the Excess Factory Tour - A thousand thank-yous for a wonderful day on Saturday. We really enjoyed taking part. The tour of the premises, with perfect commentary, was very interesting and informative. Thank you also for allowing me to see a preview of my own boat. "

Tim G

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Tim G - EXCESS 14

J. Yu

"The boat was really light and fast, the mainsail is laregerand easier to operate. The sails can be hoisted and lowered very quicly... The self-tacking of the foresail, ma,ny catamarans don't have this. This one is especially good for leisure sailing, family outing, for the begginers starters... First of all, it's covenient. That's impportant, it's easy to maneuver, it's easy to get started."

J. Yu - EXCESS 11

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Excess is the Beneteau Group's brand of catamarans with a fun and refreshing character. The yearning to put to sea is now taking on new desires and new needs. It was starting from this observation that we envisaged our catamarans. Our brand invites you to enjoy the pleasure of being under sail with your tribe and living new adventures at sea.

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    Dominique est un autodidacte passionné de tout. Sa vie, il l'a construite sur des multicoques. Il aime d'ailleurs la raconter dans plusieurs livres (retrouvez ici les livres de Dominique) quand il ne bricole pas son embarcation (retrouvez ici les choix de Dominique pour un catamaran à moteur).Quand il doit penser à une annexe pour son dernier catamaran, c'est naturellement qu'il imagine un ...

  6. DIY Cruising Catamaran: Complete Building Guide

    If you were to build a 40-foot (12.1-meter) catamaran, your cost of materials would range between 20-30% of the total cost. Therefore, for $300,000 total, the boat's materials would range between $60,000 and $90,000. The hull tends to range between 15-35% of the total build.

  7. ArcheAge : Fabrication d'un Catamaran

    Bienvenue, aujourd'hui je vous montre comment fabriquer un Catamaran !Vous pouvez retrouver tout pleins de News, Guide et tutos sur http://elysium-gaming.fr/...

  8. Build your own A Class catamaran! :: Catamaran Sailboats at

    This is the first step in building a catamaran. The 3mm Okume plywood must be scarfed together. The scarfes are saturated with epoxy and then placed in a glue joint to make a solid glue joint. A skill, known in boat building as lofting, the skins which will make the hull are cut out of the lengths of plywood.

  9. Catamaran Kit Process

    STEP 4. The fairing is now complete, this is done using a filler compound mixed with our West System epoxy resin and applied to the surface of the hull. This process is to ensure that when painted the boat will have a smooth and glossy appearance, and as a general rule the more painstaking the paint-job and fit-out, the higher your resale value.

  10. How to build a Catamaran

    Building Catamarans and Trimarans; Share Your Experience, Learn From Others. In partnership with The Coastal Passage. This site will feature building projects from as great a variety of materials and build methods as possible. If it's a multihull or any project that relates or enlightens we want to feature it here.

  11. How To Build Catamarans

    8: End of L to deck beam. 9: Aft support E' to crossbeam. A 30 FT. CATAMARAN. The deck of the previous boat is but 18 inches above the surface of the water, and besides a great bulk of hulls is exposed to the action of the sea; consequently it would hardly do for bay sailing.

  12. 50 ans de savoir-faire et d'innovation

    Fountaine Pajot dévoile à la rentrée 2023 le plus grand catamaran à voile de luxe jamais construit par le Chantier : un catamaran de 80 pieds, le Thira 80. Constructeur de bateaux français emblématique, Fountaine Pajot conçois depuis bientôt 50 ans des catamarans de luxe et motor yachts de haut standing.

  13. Catamaran Construction

    All modern production catamarans are made with "FRP" construction (for Fiber Reinforced Polymer). Composites aren't new-it's just using materials together to strengthen the whole assembly. Straw was added to bricks centuries ago, and steel reinforced concrete is a staple of construction over the last century.

  14. Principes de construction de nos catamarans

    Principes de construction de nos catamarans. Pour le chantier Outremer, la conception d'un bateau part d'un cahier des charges exigeant. De sa cohérence découle le dessin de l'architecte, qui travaille en étroite collaboration avec les designers et les ingénieurs pour obtenir un résultat harmonieux.

  15. Fountaine Pajot

    Inspirés par la passion de la voile et l'amour des océans, Fountaine Pajot combine depuis plus d'un demi-siècle vision, savoir-faire et innovation pour concevoir le meilleur des bateaux.

  16. Catamaran (construction en aluminium)

    construction en aluminium d'un catamaran bateau atelier destiné à la mytiliculture

  17. MULTICOQUES MATCH Construire un catamaran de croisière prototype

    A l'époque, je ne connaissais rien au design ou à la construction des bateaux, mais mon bagage en ingénierie me montrait que la première exigence de la fabrication d'un bateau était la rigidité des panneaux, et que ce sont les différentes formes de sandwichs qui offrent la meilleure rigidité.

  18. BRIX Marine

    ABOUT BRIX MARINE. has earned a solid reputation for pioneering and crafting the world's most rugged aluminum catamarans and workboats since 1991. The company was founded in Canada and moved to Port Angeles, WA in 2001. We gained new ownership under Bryton Marine Group in 2017, which fortified the company's focus on our Core Values and ...

  19. Bayesian (yacht)

    Bayesian was a flybridge sloop designed by Ron Holland and built with a 56 m (184 ft) aluminium hull and a single-masted cutter rig.The 75 m (246 ft) aluminium mast was at the time of construction was the world's tallest. The yacht had a lifting keel, allowing its draft to be reduced from 10 m to 4 m. [7] It was one of a number of similar vessels from the same designer and shipyard and was one ...

  20. Excess: the catamaran brand that combines comfort and thrills under sail

    OUR DNA. Excess is the Beneteau Group's brand of catamarans with a fun and refreshing character. The yearning to put to sea is now taking on new desires and new needs. It was starting from this observation that we envisaged our catamarans. Our brand invites you to enjoy the pleasure of being under sail with your tribe and living new adventures ...

  21. catamaran aluminium en cours de construction

    Chantier naval RolagrdshipyardsConstruction en aluminium d'un nouveau catamaran de 14m50 x 7m50 avec 2 moteurs de 170 CV chacun, 4 cabines.Une version de 19m...

  22. CONSTRUCTION D'UN TRIMARAN EN BOIS ECO-RESPONSABLE (01)

    Architecte naval, j'entreprends la construction d'un trimaran en bois afin de proposer une alternative aux voiliers traditionnels.Un véritable voyage en Médi...

  23. Construction & Fabrication RC trimaran MINI 40

    Cette vidéo est un montage du projet tutoré sur 1 an à l'IUT Génie mécanique et productique de Toulon la garde.De la conception à la fabrication, je vous pré...

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