Diamond 27
Masthead Sloop · Long Keel w/trans. Hung Rudder · 1963–1966
A masthead sloop with a 50% ballast ratio, built for only three years before the moulds were sold to Offshore Yachts
Designed by Alan H. Buchanan, built by Thames Marine Ltd.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Long Keel w/trans. Hung Rudder
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her heavy displacement on a narrow beam gives 28 — a moderate, middle-of-the-road motion.
At 1.69 she sits well under the 2.0 line — a solidly ocean-capable hull for her size.
323 — heavy for her waterline, built to carry stores and ride steadily.
14.2 — modest power for her weight; easygoing rather than lively, and happier with a breeze.
50% of her weight is ballast — stiff, standing up well to her sails.
Built heavy and sea-kindly — a boat made to cross oceans and forgive a rough night.
- Narrower than ~80% of boats her size on file
Compared with 304 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.
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.
The family
Boats like this
Nearby designs by size, type, and era — worth a look alongside her.
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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