BoatsSigma 33 OOD

Sigma 33 OOD

Fractional Sloop · Fin keel, spade rudder · 1979–1991

A David Thomas-designed fractional sloop built in high numbers, featuring a stiff fin-keel hull for competitive sailing

Designed by David Thomas, built by Marine Projects Ltd.

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

See her sail

The Sigma 33 OOD, on the water

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

Footage from Golden Globe Race Official

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 22 — a moderate, middle-of-the-road motion.

Comfort ratio 22
CoastalBluewater

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

Capsize screening 2.01
LightHeavy

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

Displacement / length 227
EasygoingPowered-up

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

Sail area / displacement 17.0
TenderStiff

38% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 38%

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

What the fleet has seen

The Sigma 33 OOD, as the fleet has seen it

Derived from the videos the fleet has analysed of this model. ▶ marks open the moment aboard.

The Sigma 33 OOD is a 9.9-meter fractional sloop designed by David Thomas and built by Marine Projects Ltd. and Northshore Yachts between 1979 and 1991. Over 400 Sigma 33s were built, including the Sigma 33C variant, which features a shorter masthead rig and a shallower draft of 4.83 feet. The OOD model has a fin keel with a spade rudder, a beam of 3.2 meters, a draft of 1.8 meters, and displaces 4173 kg.

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
37.7%
Rig & sail area
Rig
Fractional Sloop
Ratios
SA / displacement
17.0
Displacement / length
227.1
Comfort ratio
22.1
Capsize screening
2.01
Hull speed
6.9 kn
Pounds / inch immersion
985
Hull
Hull type
Fin w/spade rudder
Construction
Fiberglass
Ballast type
Iron
Production
Years built
1979–1991
Units built
400
Designer
David Thomas
Builder
Marine Projects Ltd, Northshore Yachts

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.

Maxi Yachts 339.90 mSame hull familyNear-identical lengthA 9.9-metre coastal cruiser derived from the 999, featuring a 1.43-metre draft for versatile performance
Unexpected Sailing Trip - From Bad to Good - Ep. 404 RAN Sailing4:50from RAN Sailing
Catalina Yachts 3099.98 mSame hull familyNear-identical lengthA 9.98-metre fractional sloop with a 1.91-metre draft, built between 2005 and 2012 for performance-oriented coastal cruising
Crossing Lake Michigan for the First Time7:53from Sailing Into Oblivion
Hunter Marine 339.96 mSame hull familyNear-identical lengthA 1977 masthead sloop with a 38% ballast ratio, designed for stability and coastal performance
DON'T buy a HUNTER.. Everything you need to know - Ep 109 - Lady K Sailing6:32from Lady K Sailing
Contention 33 (Peterson)10.00 mSame hull familyNear-identical lengthA Doug Peterson-designed masthead sloop that proved its competitive pedigree with a 3rd place finish at the 1979 3/4 Ton Cup
Veleiro Velho Marujo: expeditions in Paraná9:37from Podcast Maré Sonora ®
Islander 329.91 mSame hull familyNear-identical lengthA J.H. McGlasson-designed masthead sloop that served as the foundational hull for the later Islander 33 and 34 models
INSIDER’S GUIDE to the Long Beach Boat Auction 🚤 | How to Score a Sailboat for Cheap1:35from Sailing Solé
Feeling 329.95 mSame hull familyNear-identical lengthA high-performance fractional sloop from the Joubert-Nivelt studio, designed with a light displacement for spirited sailing
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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.

Sigma 36 (S&S)A 1968 Sparkman & Stephens masthead sloop with a 52% ballast ratio, built for offshore stability on a fin-keel hullSigma 38 (S&S)A Sparkman & Stephens masthead sloop designed for offshore stability with a skeg-hung rudder and heavy displacementSr 33A high-performance fractional sloop with a 28.3 SA/D ratio, featuring a lifting keel and production history by C&CC&C Yachts 33A 1970s masthead sloop with a fin keel and spade rudder that served as the foundation for the European C&C 30EDelphia Yachts 33A 9.98-metre cruiser with a 1.78-metre fin and bulb keel, balanced for coastal stability since 2008She 33A Sparkman & Stephens masthead sloop with a high sail area-to-displacement ratio, designed for performance in 1978

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