BoatsNational One-Design

National One-Design

Fractional Sloop · Centerboard Dinghy · First built 1936

A high-performance 1936 fractional sloop designed by William F. Crosby and governed by a dedicated racing association

Designed by William F. Crosby, built by Ray Greene.

LOA
Beam
Draft (max)
Displacement
Hull type
Centerboard Dinghy

Is it for you?

Character

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

TrailerableBeam 1.73 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 181 kg of hull, so roughly 800 kg on a trailer: check that against your own towing rating.Ramp-launchableAbout 181 kg of hull, with a keel that raises or a draft shallow enough to float off a trailer — she can go back on the trailer at the ramp, not only into the water.Shoal draftDraws 0.05 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelySea-kindly

Her light displacement on a moderate beam gives 5 — a quick, lively motion that feels every wave.

Comfort ratio 5
CoastalBluewater

At 3.08 she sits above the 2.0 line — beamy for her weight, and happiest coastal.

Capsize screening 3.08
LightHeavy

154 — light for her waterline, so she is easily driven and quick to accelerate.

Displacement / length 154
EasygoingPowered-up

40.4 — a lot of sail for her weight; powered-up and eager, a real performer.

Sail area / displacement 40.4

Light and lively — happiest day-sailing and coastal-hopping in settled weather.

The record

Full specifications

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

Dimensions
Weights
Rig & sail area
Rig
Fractional Sloop
Ratios
SA / displacement
40.4
Displacement / length
154.3
Comfort ratio
4.9
Capsize screening
3.08
Hull speed
4.3 kn
Pounds / inch immersion
213
Hull
Hull type
Centerboard Dinghy
Construction
Wood or Fiberglass
Production
Years built
First built 1936
Units built
1000
Designer
William F. Crosby
Builder
Ray Greene, Co

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.

MacKay Boats Ltd. 49erfx4.88 mSame hull family0.3 m shorterA high-performance skiff utilizing the 49er hull with a downsized rig specifically optimized for lighter crews
LaserPerformance 49er4.88 mSame hull family0.3 m shorterAn Olympic-class high-performance skiff featuring a massive sail-area-to-displacement ratio for elite racing
Spindrift 134.06 mSame hull family1.1 m shorterA Hubert Vandestadt-designed centerboard dinghy with a high sail-area-to-displacement ratio for lively, responsive sailing
Several Under License 29er4.40 mSame hull family0.8 m shorterA high-performance skiff designed by Julian Bethwaite, featuring a powerful fractional rig for competitive racing
Aubin (Chantier Aubin) Snipe4.72 mSame hull family0.5 m shorterA legendary William F. Crosby-designed fractional dinghy that remains one of the world's most active racing classes

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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