BoatsWesterly Marine Ltd. Gk 34

Westerly Marine Ltd. Gk 34

Fractional Sloop · Fin keel, spade rudder · 1980–1981

An Ed Dubois-designed fractional sloop featuring a high sail-area-to-displacement ratio and rare Kevlar Grand Prix variants

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 light displacement on a moderate beam gives 17 — a quick, lively motion that feels every wave.

Comfort ratio 17
CoastalBluewater

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

Capsize screening 2.22
LightHeavy

177 — light for her waterline, so she is easily driven and quick to accelerate.

Displacement / length 177
EasygoingPowered-up

21.5 — plenty of sail for her weight; lively and quick to respond.

Sail area / displacement 21.5
TenderStiff

55% of her weight is ballast — very stiff, carrying full sail in a blow.

Ballast 55%

Light and lively — happiest day-sailing and coastal-hopping in settled weather.

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Ballast / displacement
54.8%
Rig & sail area
Rig
Fractional Sloop
Ratios
SA / displacement
21.5
Displacement / length
177.0
Comfort ratio
17.5
Capsize screening
2.22
Hull speed
7.0 kn
Pounds / inch immersion
1112
Hull
Hull type
Fin w/spade rudder
Construction
Fiberglass
Ballast type
Cast Iron
Production
Years built
1980–1981
Units built
17
Designer
Ed Dubois
Builder
Westerly Marine 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.

Jeanneau 34.210.29 mSame hull familyNear-identical lengthA Jacques Fauroux-designed masthead sloop widely favored for Mediterranean and Aegean charter fleets
Mirage 3310.21 mSame hull familyNear-identical lengthA Robert Perry-designed masthead sloop offering a balanced, performance-oriented cruiser profile in a 33-foot hull
J Boats Tillotson Pearson J/10510.52 mSame hull family0.2 m longerA 10.52-metre fractional sloop featuring a high 23.65 sail area-to-displacement ratio for agile, responsive handling
Tartan Marine 34-210.49 mSame hull familyNear-identical lengthA Sparkman & Stephens masthead sloop featuring an extended stern and refined interior based on the Tartan 33R
X-Yachts X-3410.36 mSame hull familyNear-identical lengthA Niels Jeppesen-designed fractional sloop balancing performance and comfort with a stiff, bulb-keeled hull
Cal Boats 3410.13 mSame hull family0.2 m shorterA masthead sloop with a fin keel and spade rudder, favored by Jensen Marine founder Jack Jensen for personal cruising

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.

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