BoatsWesterly Yachts Ltd. Tempest 31

Westerly Yachts Ltd. Tempest 31

Masthead Sloop · Fin keel, spade rudder · 1987–1993

An Ed Dubois-designed masthead sloop built for performance, featuring a stiff fin keel and spade rudder configuration

Designed by Ed Dubois.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Fin w/spade Rudder

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

LivelySea-kindly

Her moderate displacement on a beamy beam gives 22 — a moderate, middle-of-the-road motion.

Comfort ratio 22
CoastalBluewater

2.08 — right around the 2.0 line, the edge between coastal and offshore.

Capsize screening 2.08
LightHeavy

274 — moderately heavy for her waterline, a balanced cruising weight.

Displacement / length 274
EasygoingPowered-up

14.8 — modest power for her weight; easygoing rather than lively, and happier with a breeze.

Sail area / displacement 14.8
TenderStiff

30% of her weight is ballast — on the tender side; she'll heel readily and want a reef sooner.

Ballast 30%

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.

Dimensions
Weights
Ballast / displacement
29.8%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
14.8
Displacement / length
273.8
Comfort ratio
22.2
Capsize screening
2.08
Hull speed
6.6 kn
Pounds / inch immersion
948
Hull
Hull type
Fin w/spade rudder
Construction
Fiberglass
Production
Years built
1987–1993
Units built
107
Designer
Ed Dubois
Builder
Westerly Yachts Ltd

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.

Spirit 329.48 mSame hull family0.2 m longerA Jacques De Ridder-designed IOR 23-footer built for nearly two decades as a stiff, masthead-rigged fin-keel sloop
Cal Boats 309.14 mSame hull family0.2 m shorterOffered with an optional tall rig, this masthead sloop served as the predecessor to the 2-30 series
Maxi Yachts 959.50 mSame hull family0.2 m longerA 9.5-metre masthead sloop produced for a decade, featuring a skeg-hung rudder for predictable coastal handling
Compromis 9099.45 mSame hull familyNear-identical lengthA 1985 Frans Maas masthead sloop featuring a shallow 1.24m draft and a 37% ballast ratio for stable coastal cruising
Granada Yachts 319.39 mSame hull familyNear-identical lengthA masthead sloop with a spade rudder and nearly 46% ballast ratio, designed for stability in a 31-foot hull
Dufour Yachts 38009.35 mSame hull familyNear-identical lengthMarketed in the US as the Dufour 31 Frers, this 9.35-metre sloop was offered with both fractional and masthead rigs

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

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