BoatsIrwin Yacht 1/2 Ton MKII

Irwin Yacht 1/2 Ton MKII

Masthead Sloop · Lifting Keel · First built 1977

A Ted Irwin-designed masthead sloop featuring a lifting keel, transom-hung rudder, and a broader beam aft

Designed by Ted Irwin.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Lifting Keel

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

Shoal draftDraws 1.07 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 17 — a quick, lively motion that feels every wave.

Comfort ratio 17
CoastalBluewater

At 2.34 she sits above the 2.0 line — beamy for her weight, and happiest coastal.

Capsize screening 2.34
LightHeavy

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

Displacement / length 224
EasygoingPowered-up

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

Sail area / displacement 17.6
TenderStiff

48% of her weight is ballast — stiff, standing up well to her sails.

Ballast 48%

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

  • Beamier than ~87% of boats her size on file

Compared with 400 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
48.0%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
17.6
Displacement / length
223.8
Comfort ratio
16.7
Capsize screening
2.34
Hull speed
6.6 kn
Pounds / inch immersion
989
Hull
Hull type
Lifting Keel
Construction
Fiberglass
Ballast type
Lead
Production
Years built
First built 1977
Designer
Ted Irwin
Builder
Irwin Yacht, Marine Corporation

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.

O'day 329.63 mSame hull familyNear-identical lengthA 9.6-metre masthead sloop with a deep-draft keel-centerboard configuration designed for versatile coastal cruising
Ovni 3711.90 mSame hull family2.2 m longerA Philippe Briand-designed aluminum cutter featuring a centerboard and a stern scoop extension for versatile cruising
Southerly 11010.82 mSame hull family1.1 m longerA Rob Humphreys-designed fractional sloop with a swing keel that allows for shallow-water exploration and drying out
Tartan Marine 34 C10.49 mSame hull family0.7 m longerA Sparkman & Stephens masthead sloop featuring a keel-centerboard hull designed for shoal water and IOR competition
Jeanneau Sun Odyssey 3510.67 mSame hull family0.9 m longerA Marc Lombard-designed fractional sloop featuring a lifting keel and twin rudders for versatile shoal-water 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.

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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