Cat (Marconi) · Centerboard Dinghy · First built 1968
A lightweight 3.5-metre centerboard dinghy designed by Sparkman & Stephens with a high sail-area-to-displacement ratio
Designed by Sparkman & Stephens.
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 1.40 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 89 kg of hull, so roughly 700 kg on a trailer: check that against your own towing rating.Ramp-launchableAbout 89 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 0.09 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 3 — a quick, lively motion that feels every wave.
Comfort ratio 3
CoastalBluewater
At 3.16 she sits above the 2.0 line — beamy for her weight, and happiest coastal.
Capsize screening 3.16
LightHeavy
57 — light for her waterline, so she is easily driven and quick to accelerate.
Displacement / length 57
EasygoingPowered-up
34.3 — a lot of sail for her weight; powered-up and eager, a real performer.
Sail area / displacement 34.3
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
Cat (Marconi)
Ratios
SA / displacement
34.3
Displacement / length
57.2
Comfort ratio
3.4
Capsize screening
3.16
Hull speed
4.5 kn
Pounds / inch immersion
188
Hull
Hull type
Centerboard Dinghy
Construction
Fiberglass
Production
Years built
First built 1968
Designer
Sparkman, Stephens
Builder
Yankee Yachts
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.
Spindrift 134.06 mSame hull family0.5 m longerA Hubert Vandestadt-designed centerboard dinghy with a high sail-area-to-displacement ratio for lively, responsive sailing
Beneteau First 144.30 mSame hull family0.8 m longerA Samuel Manuard-designed performance dinghy with a high sail-area-to-displacement ratio for spirited, responsive sailing
O'day 123.76 mSame hull family0.2 m longerA lightweight cat-rigged dinghy featuring a simple unstayed mast and daggerboard, sharing her hull with the Widgeon
Lido 144.27 mSame hull family0.7 m longerA fractional sloop dinghy designed by Barney Lehman, updated in 1995 with a modern mold for improved longevity and safety
Fairey Marine Firefly3.66 mSame hull familyNear-identical lengthThe 1948 Olympic single-handed class, this Uffa Fox design was the first sailboat ever produced by Fairey Marine
