San Juan 23, MK I

Description

The San Juan 23 Mark I (often just called the San Juan 23) is the original version of this iconic trailerable sailboat, designed by Bruce Kirby in collaboration with Don Clark of the Clark Boat Company. Introduced in 1975, it's a masthead sloop known for its lightweight design, ease of trailering, and balance of racing performance and family cruising. Built primarily with a stub keel and centerboard for shallow-water versatility, it was produced until around 1977, before the updated Mark II (or 23-2) arrived with a taller rig and larger sail area. Over 600 San Juan 23s of all variants were built until 1989, making it a staple for entry-level sailors.

Construction Details

Designer Bruce Kirby
Builder Clark Boat Company
Length 23.000 ft
LOA 23.000 ft
LWL 20.330 ft
Beam 8.000 ft
Displacement 2700 lb
Ballast 960 lb
Max Draft 4.750 ft
Min Draft 1.920 ft
Year Built 1975
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The standard boat dimensions

i 28 ft
j 9.50 ft
p 24 ft
e 8.75 ft
p2 -
e2 -
i2 -
j2 -

Sails

San Juan 23, MK I - MAINSAIL

Luff * 24 ft - (7315 mm)
Foot * 8.75 ft - (2667 mm)
Leech * 25.08 ft - (7644 mm)
Tack Angle * 88 °
Diagonal * 25.26 ft - (7699 mm)
Head (inches) * 4 in - (102 mm)
Area * 108.47 ft²
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San Juan 23, MK I - JIBSAIL

Luff * 23.65 ft - (7209 mm)
Foot * 12.71 ft - (3874 mm)
Leech * 20.33 ft - (6197 mm)
Percentage LP * 114.95 %
Length Perpendicular * 10.92 ft - (3328 mm)
Deck Angle * 12.03 °
Area * 129.14 ft²
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San Juan 23, MK I - JIBSAIL

Luff 23 ft - (7010 mm)
Foot 10 ft - (3048 mm)
Leech 20 ft - (6096 mm)
Percentage LP * 91.26 %
Length Perpendicular * 8.67 ft - (2643 mm)
Deck Angle * 11.11 °
Area * 99.74 ft²
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San Juan 23, MK I - JIBSAIL

Luff 24.25 ft - (7391 mm)
Foot 11.33 ft - (3453 mm)
Leech 20.5 ft - (6248 mm)
Percentage LP * 100.42 %
Length Perpendicular * 9.54 ft - (2908 mm)
Deck Angle * 13.87 °
Area * 115.71 ft²
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San Juan 23, MK I - GENOA

Luff * 28.09 ft - (8562 mm)
Foot * 15.45 ft - (4709 mm)
Leech * 26.31 ft - (8019 mm)
Percentage LP * 150 %
Length Perpendicular * 14.25 ft - (4343 mm)
Deck Angle * 4 °
Area * 200.13 ft²
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San Juan 23, MK I - GENOA

Luff 27 ft - (8230 mm)
Foot 15.42 ft - (4700 mm)
Leech 25.5 ft - (7772 mm)
Percentage LP * 150.11 %
Length Perpendicular * 14.26 ft - (4346 mm)
Deck Angle * 3.6 °
Area * 192.54 ft²
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San Juan 23, MK I - GENOA

Luff 27 ft - (8230 mm)
Foot 13.92 ft - (4243 mm)
Leech 25.25 ft - (7696 mm)
Percentage LP * 135.58 %
Length Perpendicular * 12.88 ft - (3926 mm)
Deck Angle * 3.56 °
Area * 173.87 ft²
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San Juan 23, MK I - DRIFTER

Luff * 28.09 ft - (8562 mm)
Foot * 16.1 ft - (4907 mm)
Leech * 25.05 ft - (7635 mm)
Perc LP * 150 %
Length Perp * 14.25 ft - (4343 mm)
Deck Angle * 8.98 °
Area * 200.17 ft²
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San Juan 23, MK I - ASYMMETRICAL

Luff 29 ft - (8839 mm)
Foot 17 ft - (5182 mm)
Leech 26.5 ft - (8077 mm)
Perc LP * 165 %
Area * 370 ft²
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San Juan 23, MK I - SPINNAKER

Stays * 28.09 ft - (8562 mm)
MidGirth * 17.1 ft - (5212 mm)
Foot * 17.1 ft - (5212 mm)
Perc LP * 180 %
Area * 408 ft²
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San Juan 23, MK I - STORMJIB

Luff 14.75 ft - (4496 mm)
Foot 7 ft - (2134 mm)
Leech 11.5 ft - (3505 mm)
Perc LP * 56 %
Length Perp * 5.32 ft - (1622 mm)
Deck Angle * 21.83 °
Area * 39.21 ft²
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Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.

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