San Juan 21
Fractional Sloop · Swing Keel · 1970–1977
A high-performance fractional sloop with a swing keel, designed by Don Clark as the first of the iconic San Juan line
Designed by Don Clark, built by Clark Boat Co.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Swing Keel
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her light displacement on a moderate beam gives 8 — a quick, lively motion that feels every wave.
At 2.60 she sits above the 2.0 line — beamy for her weight, and happiest coastal.
114 — light for her waterline, so she is easily driven and quick to accelerate.
26.3 — a lot of sail for her weight; powered-up and eager, a real performer.
32% of her weight is ballast — on the tender side; she'll heel readily and want a reef sooner.
Light and lively — happiest day-sailing and coastal-hopping in settled weather.
- Lighter than ~77% of boats her size on file
- Narrower than ~80% of boats her size on file
Compared with 557 boats of the same type within a quarter of her length.
The record
Full specifications
The complete reference set — tap any figure to switch between metric and imperial.
Boats like this, on the water
Nobody has filmed this one — but these are close.
Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.
The family
Related models
The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.
Keep looking
Nothing filmed of this one yet
Two ways to keep looking — both search what the fleet has actually recorded.
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