Swan 431
Masthead Sloop · Fin With Rudder On Skeg · 1976–1978
A Sparkman & Stephens masthead sloop featuring a skeg-hung rudder and a high ballast ratio for offshore stability
Designed by Sparkman & Stephens, built by Nautor.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Fin With Rudder On Skeg
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her heavy displacement on a moderate beam gives 36 — a sea-kindly motion in a seaway.
1.80 — just under the 2.0 offshore line; her beam is modest for her weight.
320 — heavy for her waterline, built to carry stores and ride steadily.
16.2 — moderate power for her weight; steady, all-round performance.
45% of her weight is ballast — stiff, standing up well to her sails.
A capable cruiser that sits just inside the offshore line — coastal work with real passages in her.
- Heavier than ~83% of boats her size on file
- Draws more than ~87% of boats her size on file
- Beamier than ~76% of boats her size on file
Compared with 2563 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
Boats like this
Nearby designs by size, type, and era — worth a look alongside her.
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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