BoatsAllmand 31

Allmand 31

Masthead Sloop · Fin With Rudder On Skeg · 1978–1985

A masthead sloop with a shallow 1.17m draft, originally introduced as the SAIL 31 and built for shoal-water cruising

Designed by Walter Scott & T. R. Allmand.

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.

Shoal draughtDraws 1.17 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelySea-kindly

Her moderate displacement on a beamy beam gives 24 — a moderate, middle-of-the-road motion.

Comfort ratio 24
CoastalBluewater

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

Capsize screening 2.04
LightHeavy

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

Displacement / length 228
EasygoingPowered-up

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

Sail area / displacement 14.9
TenderStiff

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

Ballast 39%

A balanced, easily-driven cruiser — comfortable and forgiving for coastal work.

  • Draws less than ~91% of boats her size on file
  • Beamier than ~76% of boats her size on file

Compared with 2598 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.

Dimensions
Weights
Ballast / displacement
38.7%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
14.9
Displacement / length
227.7
Comfort ratio
23.5
Capsize screening
2.04
Hull speed
7.1 kn
Pounds / inch immersion
1130
Hull
Hull type
Fin with rudder on skeg
Construction
Fiberglass
Ballast type
Mixed Iron/Lead
Production
Years built
1978–1985
Designer
Walter Scott, T. R. Allmand
Builder
Allmand Boats Inc

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 familyNear-identical lengthA Jacques De Ridder-designed IOR 23-footer built for nearly two decades as a stiff, masthead-rigged fin-keel sloop
Hunter Marine 319.55 mSame hull family0.2 m longerA Cortland Steck design featuring a B&R rig and a fin keel, built for coastal cruising between 1983 and 1987
Nonsuch 309.24 mSame hull familyNear-identical lengthA 30-foot cruiser with a 43% ballast ratio, offering a stable and stiff platform for coastal cruising
Granada Yachts 309.18 mSame hull family0.2 m shorterA 30-foot fractional sloop with a 1.65-meter draft, designed for balanced, performance-oriented cruising
Maxi Yachts 959.50 mSame hull familyNear-identical lengthA 9.5-metre masthead sloop produced for a decade, featuring a skeg-hung rudder for predictable coastal handling
Catalina Yachts 309.12 mSame hull family0.3 m shorterWith over 6,000 hulls produced, this versatile masthead sloop remains one of the most successful production yachts ever built

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

Two ways to keep looking — both search what the fleet has actually recorded.

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