Masthead Sloop · Keel/centreboard · First built 1975
A versatile keel-centerboard cruiser derived from the racing-oriented San Juan 24 and built internationally under multiple names
Designed by B. Kirby, Clark & Bruce Kirby.
LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Keel/Cbrd.
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
TrailerableBeam 2.44 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 1,225 kg of hull, so roughly 1,800 kg on a trailer: check that against your own towing rating.Shoal draftDraws 0.59 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 12 — a quick, lively motion that feels every wave.
Comfort ratio 12
CoastalBluewater
2.30 — right around the 2.0 line, the edge between coastal and offshore.
Capsize screening 2.30
LightHeavy
143 — light for her waterline, so she is easily driven and quick to accelerate.
Displacement / length 143
EasygoingPowered-up
19.7 — plenty of sail for her weight; lively and quick to respond.
Sail area / displacement 19.7
TenderStiff
36% of her weight is ballast — moderately stiff, a middle-of-the-road stability.
Ballast 36%
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
Ballast / displacement
35.6%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
19.7
Displacement / length
143.4
Comfort ratio
12.4
Capsize screening
2.30
Hull speed
6.0 kn
Pounds / inch immersion
581
Hull
Hull type
Keel/Cbrd.
Construction
Fiberglass
Ballast type
Lead
Production
Years built
First built 1975
Designer
B.Kirby, Clark, Bruce Kirby
Builder
Clark Boat 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.
O'day 226.61 mSame hull family0.4 m shorterA prolific production success with over 3,000 hulls built, offering a nimble fractional rig for coastal daysailing
Catalina Yachts 227.26 mSame hull family0.3 m longerA swing-keel masthead sloop with 15,000 units sold, offering a highly versatile and trailerable coastal cruiser
Spirit 21 (6.5)6.48 mSame hull family0.5 m shorterA Henry Hinckley-designed masthead sloop featuring a pop-top cabin for versatile headroom in a compact, trailerable hull
Cal Boats 247.43 mSame hull family0.4 m longerThe inaugural Jensen Marine Cal model, this fractional keel-centerboard sloop was built for shoal-water versatility
Phobos 196.30 mSame hull family0.7 m shorterA lightweight, high-performance fractional sloop with a high sail-area-to-displacement ratio for spirited daysailing
Hunter Marine 2407.34 mSame hull family0.3 m longerA trailerable swing-keel cruiser featuring a B&R rig and water ballast, also marketed as the Hunter Legend 240
