Neptun 31
Masthead Sloop · Fin Keel · 1970–1973
An IOR-rated 9.3-meter fin-keel sloop from the early seventies, designed with a 33% ballast ratio for coastal stability
Designed by Anton de Dood Miglitsch.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Fin Keel
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her moderate displacement on a moderate beam gives 18 — a quick, lively motion that feels every wave.
2.07 — right around the 2.0 line, the edge between coastal and offshore.
206 — moderately heavy for her waterline, a balanced cruising weight.
10.4 — modest power for her weight; easygoing rather than lively, and happier with a breeze.
33% of her weight is ballast — on the tender side; she'll heel readily and want a reef sooner.
A balanced, easily-driven cruiser — comfortable and forgiving for coastal work.
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
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