A fractional sloop centerboard dinghy adapted from the Cape Cod Knockabout and produced throughout the 1960s
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 1.80 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 204 kg of hull, so roughly 800 kg on a trailer: check that against your own towing rating.Ramp-launchableAbout 204 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 0.15 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 beamy beam gives 4 — a quick, lively motion that feels every wave.
Comfort ratio 4
CoastalBluewater
At 3.09 she sits above the 2.0 line — beamy for her weight, and happiest coastal.
Capsize screening 3.09
LightHeavy
64 — light for her waterline, so she is easily driven and quick to accelerate.
Displacement / length 64
EasygoingPowered-up
34.1 — a lot of sail for her weight; powered-up and eager, a real performer.
Sail area / displacement 34.1
Light and lively — happiest day-sailing and coastal-hopping in settled weather.
Heavier than ~79% of boats her size on file
Compared with 361 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
Rig & sail area
Rig
Fractional Sloop
Ratios
SA / displacement
34.1
Displacement / length
63.6
Comfort ratio
4.3
Capsize screening
3.09
Hull speed
5.1 kn
Pounds / inch immersion
310
Hull
Hull type
Centerboard Dinghy
Construction
Fiberglass
Production
Years built
1960–1968
Builder
O'Day Corp
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 Daysailer5.11 mSame hull family0.3 m longerA 1956 centerboard dinghy with a high sail-area-to-displacement ratio that remains in production today
Finn (Monotype)4.50 mSame hull family0.3 m shorterA Richard Sarby-designed Olympic single-handed dinghy featuring an unstayed cat rig and a long history of competition
Small Craft Ltd. Wayfarer4.82 mSame hull familyNear-identical lengthAn Ian Proctor-designed centerboard dinghy with a high sail-to-displacement ratio, built since 1957 in wood and fiberglass
Aubin (Chantier Aubin) Snipe4.72 mSame hull familyNear-identical lengthA legendary William F. Crosby-designed fractional dinghy that remains one of the world's most active racing classes
LaserPerformance 49er4.88 mSame hull familyNear-identical lengthAn Olympic-class high-performance skiff featuring a massive sail-area-to-displacement ratio for elite racing
