BoatsCal Boats 34

Cal Boats 34

Masthead Sloop · Fin keel, spade rudder · 1968–1975

A masthead sloop with a fin keel and spade rudder, favoured by Jensen Marine founder Jack Jensen for personal cruising

Designed by C. William Lapworth, built by Jensen Marine.

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

See her sail

The Cal Boats 34, on the water

The fleet's own footage — the truest look at how she really moves.

Footage from SheHelms Sailing

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 moderate beam gives 24 — a moderate, middle-of-the-road motion.

Comfort ratio 24
CoastalBluewater

1.89 — just under the 2.0 offshore line; her beam is modest for her weight.

Capsize screening 1.89
LightHeavy

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

Displacement / length 241
EasygoingPowered-up

18.0 — moderate power for her weight; steady, all-round performance.

Sail area / displacement 18.0
TenderStiff

39% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 39%

A capable cruiser that sits just inside the offshore line — coastal work with real passages in her.

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen once across one channel of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
39.5%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
18.0
Displacement / length
241.3
Comfort ratio
24.3
Capsize screening
1.89
Hull speed
6.8 kn
Pounds / inch immersion
929
Hull
Hull type
Fin w/spade rudder
Construction
Fiberglass
Ballast type
Lead
Production
Years built
1968–1975
Units built
347
Designer
C. William Lapworth
Builder
Jensen Marine, Cal Boats

Boats like this, on the water

More boats like her, on the water

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.

Hunter Marine 339.96 mSame hull family0.2 m shorterA 1977 masthead sloop with a 38% ballast ratio, designed for stability and coastal performance
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
Islander 329.91 mSame hull family0.2 m shorterA J.H. McGlasson-designed masthead sloop that served as the foundational hull for the later Islander 33 and 34 models
Omega 3410.26 mSame hull familyNear-identical lengthA Ron Holland-designed fractional sloop from 1981, balancing a high sail-area-to-displacement ratio for spirited sailing
King's Cruiser 3310.26 mSame hull familyNear-identical lengthA Pelle Pettersson-designed masthead sloop featuring a fin keel and skeg-hung rudder for stable, classic cruising
Seidelmann Yachts 3410.36 mSame hull family0.2 m longerA 1981 masthead sloop with a 45% ballast ratio, balancing a light-displacement hull with a deep 1.65-metre fin keel

The family

Boats like this

Nearby designs by size, type, and era — worth a look alongside her.

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