san juan 28 sailboat data

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San Juan 28

San Juan 28 is a 28 ′ 8 ″ / 8.7 m monohull sailboat designed by Don Clark and built by Clark Boat Company starting in 1977.

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)

SAN JUAN 29 is similar.

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Any San Juan 28 owners?

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Along with a bit faster and roomier - IMHO too! We looked at them, probably 1st on the list until we found our Jeanneau. Lots of them around the sound being as they were made in Kent or Renton or somewhere down that way originally. A good basic boat for this area, ie sailing in teh sound, san juans etc. Marty  

"IF" speed is a thing you want, go to http://www.ussailing.org/phrf/Tool_%20HI_LO_AVG%20Report.pdf This is a hi-ave-low phrf rating for boats in the US. While PHRF is NOT the end all be all of speed for boats, it will give you a general prediciton. Hence for the two you mentioned, then this Jeanneau for sale in Belleingham, similar to mine but a bit smaller Jeanneau 201 - 222 - 213 Newport 186 - 198 - 192 San Juan 174 - 191 - 180 The Jeanneau is a bit smaller, has an out board, but probably a bit nicer more open interior than the Newport or San Juan. Not sure about price in general either. Others to look at include any of the Catalina's, 27, 28 or 30, Hunter, C&C, Cal, Ranger, Islander, Ericson among others that are very popular around here. Good luck in your quest. If you look at and buy the Jeanneau, there is an owners roundesvous at Poets Cove, a 5 star resort in the canadian Gulf Islands the third weekend in June. Islanders meet the same weekend at Port ludlow. A friend of mine has a 40'. I;ve also seen owners get togethers for Tartan, C&C, Hunter among others, You can get a list in the local 48 north rag. marty  

My boat is a 1979 San Juan 26 I can tell you that the hull is very solid. San Juan hand laid thier hulls. My 26 is a good bit slower than a 28, my PHRF rating is 240, but still competative if you want to race. One of the negatives about these boats is the lack of ventilation something you may want to add if it hasn't been done already. Also there was a writup in Good Old Boat about the Clark Boat Company,who built San Juans. It was in the January/Febuary issue if you can get your hands on one.  

San Juan 26 We sail a 26 on the Chesapeake. You are correct about the solid hand laid hull and the very poor venilation but not a blister and mine is a 76 and has survived 5 kids and many trips to the inner harbor and Annapolis and St Michaels. It wins me a bottle of wine at every club race for being last. Maybe it is the skipper. Charlie  

Are you moored in PT now? or were you taking her to Seattle? Will probably be in PT the thrusday night and or monday night around teh June 21/22 weekend coming and going from bedwell harbor to and from Edmonds. Marty  

PTsailing said: We're going to go look at a 1979 San Juan 28, I found lots of technical info on the boat (San Juan 28 website) but I would love some feedback from folks that own one or have sailed one of these boats. We're new to sailing and this would be our first boat, although I did have a Super Snark for several years When I lived in Florida before the jetskiers drove me off the intercoastal. Loved that little coleman cooler with a sail, even had a real sail made for it to replace the thin nylon one that came with it. We are also looking at a Newport 28, but the San Juan has a bit more gear and is less money. All opinions welcome. Thanks!!! Juli and Bill Click to expand...

PTsailing said: We're going to go look at a 1979 San Juan 28, I found lots of technical info on the boat (San Juan 28 website) but I would love some feedback from folks that own one or have sailed one of these boats. We're new to sailing and this would be our first boat, although I did have a Super Snark for several years When I lived in Florida before the jetskiers drove me off the intercoastal. Loved that little coleman cooler with a sail, even had a real sail made for it to replace the thin nylon one that came with it. We are also looking at a Newport 28, but the San Juan has a bit more gear and is less money. All opinions welcome. Thanks!!! Juli and Bill[ Watch out for poor venilation and you will never win a race Charlie] Click to expand...

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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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