san juan 28 sailboat data

San juan 28

The san juan 28 is a 28.67ft masthead sloop designed by don clark and built in fiberglass by clark boat company since 1977., 300 units have been built..

The San juan 28 is a moderate weight sailboat which is a good performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat. The fuel capacity is originally small. There is a very short water supply range.

San juan 28 for sale elsewhere on the web:

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SAN JUAN 28 Detailed Review

If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of SAN JUAN 28. Built by Clark Boat Company and designed by undefined, the boat was first built in 1977. It has a hull type of Fin w/spade rudder and LOA is 8.74. Its sail area/displacement ratio 18.31. Its auxiliary power tank, manufactured by 83 L, runs on undefined.

SAN JUAN 28 has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about SAN JUAN 28 and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, auxillary power tank, accomodations, contributions, who builds san juan 28.

SAN JUAN 28 is built by Clark Boat Company.

When was SAN JUAN 28 first built?

SAN JUAN 28 was first built in 1977.

How long is SAN JUAN 28?

SAN JUAN 28 is 6.81 m in length.

What is mast height on SAN JUAN 28?

SAN JUAN 28 has a mast height of 10.06 m.

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San Juan 28 - Sailboat Data, Parts & Rigging

Sailboat data, rig dimensions and recommended sail areas for San Juan 28 sailboat. Tech info about rigging, halyards, sheets, mainsail covers and more.

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San Juan 28

• Thread starter Blowboat
• Start date Jul 3, 2021
• Forums for All Owners
• Ask All Sailors

As my wife and I continue our rather low key boat search...trying to decide on timing and stuff...I came across a San Juan 28 I'm not really familiar with these boats and honestly, I would say I'm not finding a whole lot of information about them. Can anyone share some info on these boats? We live about 45 minutes from Little River, SC and a little over an hour from Southport, NC...so we would likely try and keep it in one of those places if possible. We have had tailorable boats in the past...a MacGregor 21 and then a Catalina 22. We do not race. Looking for something we could spend weekends on, mainly at the marina, but hopefully also on the hook now and then. I also hope we can take some 4-7 day trips now and then for vacation.  

Have you done an internet seachbon "San Juan 28 sailboat" to see what data, articles, reviews and threads are out there on it?  

Yea, found a few things but not like I don't other boats. Thought I'd reach out and see if anyone has thoughts or opinions.  

San Juan 28 was built in Washington State. It's a pretty solid fiberglass hull. I think it weighed in around 8,600 lbs. Lead fin keel with about 6 feet of draft. The one we had was equipped with a Yanmar 12 hp diesel (single cylinder) Some are well equipped some are fairly sparse. Ours had a 6'4" headroom with a V birth followed by a head on one side and a hanging locker on the other. The salon featured seating down both sides with a drop down table between them. The galley was port and aft next to the companionway. There is a small quarter berth starboard aft of the companionway. We rebuilt our salon making a queen-size bed that is accomplished by pulling out slides from each side of the salon. this reorients the bed to be lateral, not fore-aft. Originally the bed was too narrow for us. It's a deck-stepped aluminum mast of heavy proportions. The masthead rigged jib is the largest sail and the main is smaller. There used to be quite a few used for racing. I loved the toerail as it was stout and full of holes to tie things off. One thing I didn't like is the cockpit drain was plumbed to the same through-hull as the galley drain. So if the through-hull plugged rain could flood your boat via the galley sink. Ours had no automatic bilge pump and no easy way to get a wire to the low point. Ask me if you have specific questions. Ours was from 1977  

Thanks, Ken! I appreciate you sharing your experience.  

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Review of San Juan 28

Basic specs., 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 Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.3 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for San Juan 28 is about 138 kg/cm, alternatively 778 lbs/inch. Meaning: if you load 138 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 778 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)?

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.

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• Sailboat Guide

1978 Clark brothers San Juan 28 sailboat

• Description

Seller's Description

1978 SAN JUAN 28 SAILBOAT: comfortable cruiser (6’4” headroom) and competitive racer (victor in many races). LOA(28.67’), LWL (23.33’), BEAM(10’), DRAFT(4.5’) ATOMIC 4 30hp gasoline engine (extremely reliable) used primarily for exit/entry to marina(maybe 10hrs use/season); oil changed annually. FULLY BATTENED MAINSAIL, spare mainsail included. HARKEN MKIV UNIT 0 dual track roller-furler headfoil, CUSTOM MADE TAYLOR 135% GENOA for roller furler. Also 165%,150%, 110% GENOAS. 2 SYMMETRICAL SPINNAKERS AND SPINNAKER POLE, also reacher pole. 1 WINDSEEKER LIGHT AIR JIB. BOTTOM PAINTED ANNUALLY WITH VC-17 BOTTOM PAINT FOR RACE BOATS. PRICE:$18,000 INCLUDING CAULKINS TRAILER. CALL HARRIE: 406.451.5325

Equipment: ATOMIC 4 30hp gasoline engine (extremely reliable) used primarily for exit/entry to marina(maybe 10hrs use/season); oil changed annually. FULLY BATTENED MAINSAIL, spare mainsail included. HARKEN MKIV UNIT 0 dual track roller-furler headfoil, CUSTOM MADE TAYLOR 135% GENOA for roller furler. Also 165%,150%, 110% GENOAS. 2 SYMMETRICAL SPINNAKERS AND SPINNAKER POLE, also reacher pole. 1 WINDSEEKER LIGHT AIR JIB. BOTTOM PAINTED ANNUALLY WITH VC-17 BOTTOM PAINT FOR RACE BOATS.

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)

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• Sailboat Reviews

The San Juan 24

A fast quarter-tonner that can still compete in phrf, but numerous problems with construction quality would steer us elsewhere..

In the late 1960s and early 1970s, the Clark Boat Co. jumped on the trailer sailer bandwagon, and became a successful player in this decade-long market. Earlier, Bob and Carol Clark built Lightnings and ThistIes, and later, with the business in the hands of their son Don, the company built boats as large as 34 feet. The last boats came out of the shop in 1986, the year the company went out of business.

While the San Juan 21 trailer sailer really established the Clark Boat Co., it was the more performance-oriented boats such as the San Juan 24 and 7.7 that gave it the reputation of a successful builder of faster, under-3D-foot boats.

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San Juan 28 owners

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Hello All, We are looking for owners of San Juan 28 sailboats to interact with on a new webpage. http://homepages.about.com/tar428/sanjuan28-29sailboats/index.html Thanks, Steve.  

Hi Steve I have to bigger version the SJ30 are there any in the group  

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