Achilles 840
Masthead Sloop · Fin With Rudder On Skeg · First built 1979
A Chris Butler-designed masthead sloop with a skeg-mounted rudder, balancing a stiff 45% ballast ratio for coastal cruising
Designed by Chris Butler, built by Butler Achilles Ltd.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Fin With Rudder On Skeg
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her light displacement on a moderate beam gives 18 — a quick, lively motion that feels every wave.
2.04 — right around the 2.0 line, the edge between coastal and offshore.
172 — light for her waterline, so she is easily driven and quick to accelerate.
18.2 — plenty of sail for her weight; lively and quick to respond.
46% of her weight is ballast — stiff, standing up well to her sails.
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.
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
Related models
The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.
Keep looking
Nothing filmed of this one yet
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