BoatsSirius 31 M

Sirius 31 M

Masthead Sloop · Fin With Rudder On Skeg · First built 1988

A Peter Schmidt-designed masthead sloop with a skeg-hung rudder, built for stable, comfortable cruising since 1988

Designed by Peter Schmidt, built by Sirius-Werft.

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.

LivelySea-kindly

Her moderate displacement on a moderate beam gives 27 — a moderate, middle-of-the-road motion.

Comfort ratio 27
CoastalBluewater

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

Capsize screening 1.86
LightHeavy

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

Displacement / length 244
EasygoingPowered-up

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

Sail area / displacement 14.5
TenderStiff

45% of her weight is ballast — stiff, standing up well to her sails.

Ballast 45%

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

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
44.8%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
14.5
Displacement / length
244.3
Comfort ratio
26.6
Capsize screening
1.86
Hull speed
6.9 kn
Pounds / inch immersion
975
Hull
Hull type
Fin with rudder on skeg
Construction
Fiberglass
Production
Years built
First built 1988
Designer
Peter Schmidt
Builder
Sirius-Werft, Sirius -Werft GmbH

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.

Hunter Marine 319.55 mSame hull family0.3 m longerA Cortland Steck design featuring a B&R rig and a fin keel, built for coastal cruising between 1983 and 1987
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
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
Catalina Yachts 309.12 mSame hull family0.2 m shorterOne of the most successful production yachts in history, with over 6,000 hulls built during a 32-year run
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
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

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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