IW-Varvet Iw-31
Masthead Sloop · Fin With Rudder On Skeg · 1968–1985
A Sparkman & Stephens-designed half-tonner with a long production run, built for RORC and IOR racing performance
Designed by Sparkman & Stephens.
- 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 narrow beam gives 27 — a moderate, middle-of-the-road motion.
1.78 — just under the 2.0 offshore line; her beam is modest for her weight.
327 — heavy for her waterline, built to carry stores and ride steadily.
14.6 — modest power for her weight; easygoing rather than lively, and happier with a breeze.
44% 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.
- Narrower than ~78% of boats her size on file
Compared with 2569 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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