castle 650 yacht

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• Sailboat Guide

Castle 650 is a 21 ′ 6 ″ / 6.6 m monohull sailboat designed by Steven Douglas and built by Yachtworks (AUSTRALIA) starting in 1980.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Builder contact (2001): Yachtworks 41 Governor Rd Mordialloc, Victoria 3196, phone: 03 9580 6328

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Review of Castle 650

Basic specs..

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can sail close to the beach as the draft is just 0.30 - 0.40 meter (0.98 - 1.28 ft) dependent of the load. See immersion rate below.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Castle 650 is 2.67, indicating that this boat would not be accepted to participate in ocean races.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Castle 650 is about 106 kg/cm, alternatively 595 lbs/inch. Meaning: if you load 106 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 595 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

What is SA/D (Sail Area Displacement ratio)?

Maintenance

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

We are always looking for new photos. If you can contribute with photos for Castle 650 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

    FIND US |   Call us on (07) 3890 2322

“Always Buying, Consigning and Selling Queensland’s Best Used Boats Since 1964”

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  Call us on (07) 3890 2322

1029 Manly Road, Tingalpa, Queensland, Australia [email protected]

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Copyright © 2017 John Crawford Marine – Queensland's Used Boat Specialists

Castle 650 ** NOW SOLD **

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Sail monohulls to 25ft,        castle boats for sale, castle 650 boats for sale.

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castle 650 for sale

Castle 650 is a fast dry, stable yacht easily towed on a single axle trailer It has an active class association. Large cabin 1.5...

Trailer Sailer Castle 650

Trailer Sailer Castle 650 (6.5m) Good NSW tilt trailer (rego to 13/9/2024) Boat currently registered in NSW (to 13/11/2024) 5 hp...

Trailer sailor Castle 650

Astondoa yacht.

Castle 650 Trailer Sailor for sale, Both trailer and yacht have more than 6 months rego. The Castle 650 ...

Castle 650 No.74 “GullyRaker”

Hull in Excellent Condition- No Scratches Gel Bottom - Never Painted Brand New Main Foils in Excellent Condition Quality Metho Stove Heaps of Accessories Brand New...

Castle 650 Trailer Sailer.

Hi All. For sale is a Castle 650 Trailer Sailer (hull number 66). Sleeps four and is a very comfortable boat for day sailing,cruising...

Castle 650 Trailer Sailer

Hi, Looking for a good Castle 650 . Let me know details and pics if you have them. Thanks

Trailer Sailer - immaculate condition. Never been stored out of a shed

Castle 650 ⛵️ The perfect hybrid boat, tow it around, take it camping, cruising or racing. Not too big, not too small. It’s...

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Let's Get to Know Each Other

Let's connect, why it's important to partner with a designer on your castle 650 sail.

The design is the most critical part of your new sail. Ensuring the sail fits and performs its best is a must for our crew. The Precision Sails Design team are experts at their craft. Unlike other sail lofts all of our sailors work one-on-one with a designer to perfect their Castle 650 sail.

No Two Castle 650 Sails Are Alike

There are many factors that affect the performance and design of your sails. Location, sailing experience, and weather conditions all come into play when picking the perfect sail. Two mainsails made for two Castle 650’s in California and Florida will have different designs, sailcloth, and options based on what is best for the sailor.

Taking measurements is easy. All sailors work alongside our measurement team to measure and confirm their rig specs. This helps ensure your design is flawless and allows us to extend our Perfect Fit Guarantee to all of our sailors.

Discover the best cloth for your sailing needs, our sail details, or more about how Precision Sails is leading the sail-making industry with innovative new practices.

Proudly offering the largest selection of sailcloth in the industry, our team is always available to help you find your perfect sail. Whether you're a weekend sailor, coastal cruiser, or club racer our team is ready to walk you through the process.

Types of Sails

Precision Sail Loft specializes in producing headsails, mainsails, spinnakers, gennakers, and code zeros. So no matter the type of sail you’re looking for, we can help. Our sails are trusted by cruisers and racers alike from around the globe. Review the sail options and craftsmanship available to customize your dream sail.

Build & Process

Every sail we craft is produced to the highest standards with the best hardware, craftsmanship, and skill-set in the industry. Pair that with Precision Sails' approach to communication and your sailboat will be ready to set sail before you know it.

Unparalleled Commitment To Helping Sailors

As experts in design, communication, and production our team is ready to take on the task of making sails for your boat. Give us a call to get started.

“ I just received my asymmetrical spinnaker, with sock and turtle bag, along with a new 135 Genoa. The entire process was simple and both sales and the design team were in regular contact if there were any questions. The customer portal was easy to use and lets you keep track of where in the process your sails are. Great sails, great service -Graham Edwards (Facebook)

“ The whole team at Precision Sails was fantastic from start to finish. We’ve had a laminate main and genoa made so far and have a spinnaker on the way. They listened carefully to our needs and recommended a great sail cloth. We couldn’t have gotten more bang for our buck! -Noah Regelous (Google)

“ We received our spinnaker and launched it yesterday and I just wanted to let you know how pleased we are with it. The service we received from your company was exceptional and the quality of your product is second to none. We will certainly be return customers in the next few months to replace our main and jib sails and will recommend your company to all our sailing buddies. Once again-thank you.” -Daniel Jackson (Google)

“ we had good communication during the planning stages and the knowledgeable people at precision sails really got me fixed up good! The sails look and work fabulous! my boat sails better than it ever had! couldn’t be more pleased with the product AND the service!” -Fred Jelich (Facebook)

“ Our new furling jib for a Corsair 27 Had to be specially designed due to the height of the furler, but this was accomplished quickly and in short order we had our sail which fits beautifully and has a great shape. It’s everything we could have wanted, high tech design, thoughtfully executed and affordable.” -Nancy Y. (Yelp)

Request a Castle 650 Quote

Looking to buy a new headsail or mainsail for your Castle 650? Request a free quote from Precision Sails for a new custom sail. Our team will work with you to design the perfect sail for you.

Castle 650 ** NOW SOLD **

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CASTLE 650 HULL 151 TRANQUILLITY - IMMACULATE CONDITION   SOLD

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Elaborate 600-year-old castle — complete with moat — unearthed in France. Take a look

A rchaeologists had known for years that a hotel in Vannes, France, was built on the site of a medieval castle. The 18th century mansion-turned-hotel even named itself after the castle: the Château de l’Hermine.

What archaeologists didn’t know was how much of the 600-year-old castle was still around, buried just below the surface.

The excavations in the courtyard of the Château de l’Hermine hotel in Vannes began in February 2023 ahead of the construction of a museum, the French National Institute for Preventive Archaeological Research said in a March 26 news release.

About 10 feet down, archaeologists found the top of the castle ruins. The elaborate stone structure was built in the 1380s by the Duke of Brittany Jean IV to showcase his power, the institute said.

What remained of the 600-year-old castle was a testament to its elegance and significance.

Uncover more archaeological finds

What are we learning about the past? Here are three of our most eye-catching archaeology stories from the past week.

→ Hidden tunnel network found at abandoned 800-year-old home in France

→ Metal detectorist stumbles on 650-year-old artifact — and sparks a mystery

→ Ancient Roman ruins found in Germany help solve 140-year-old mystery, photos show

Two floors of the structure had been partially preserved, archaeologists said. The larger ground floor stretched almost 140 feet in length and 55 feet in width.

Surrounding the fortress-like castle was a moat, which could only be crossed via a wooden bridge, archaeologists said. Excavations uncovered the ancient stone pier and fragments of the bridge.

A photo shows the sloped castle wall on one side and the smaller partially collapsed stone pier on the other side. A canal-like pit — now muddy and empty — separates the two structures.

At one end, the castle ruins had indoor toilets with drainage pipes, the institute said. The arrangement of the pipes suggested the castle originally had three or four floors.

On the other side of the ancient building, archaeologists found the remnants of an integrated, water-powered mill. A photo shows the steps leading to the mill and the Tetris-block-shaped hole where the wheel once spun.

Archaeologists also found several well-preserved staircases, including a ceremonial one, the equivalent of an ancient bay window seat and fragments of defensive towers.

Smaller artifacts such as coins, jewelry, cooking tools, bowls, knives and a padlock were found in the drain pipes and moat. Photos show a few of these artifacts.

The ancient Château de l’Hermine castle was used for about a century before being abandoned in the 1470s, archaeologists said. The castle fell into disrepair and further ruin over the following centuries until it became the foundation for the 18th century mansion that still stands on the site today.

Aerial footage shared by the institute on YouTube shows what the area around the medieval castle looks like now.

Vannes is along the western coast of France and about 300 miles southwest of Paris.

Google Translate was used to translate the news release and article from the French National Institute for Preventive Archaeological Research (Inrap).

Shell collector finds rare marble depicting twins in Greek stream. See it on display

Mysterious wooden train car — almost 100 years old — unearthed in Belgium, photos show

Hidden tunnel network found at abandoned 800-year-old home in France. See inside

©2024 The Charlotte Observer. Visit charlotteobserver.com. Distributed by Tribune Content Agency, LLC.

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