Butler Achilles Ltd Achilles 840
Sailboat
27′ 10″
Since 1979
Overview
- Builder
- Butler Achilles Ltd
- Model
- Achilles 840
- Type
- Sailboat
- Built
- 1979 on
- Designer
- Chris Butler
- Hull
- Fin with rudder on skeg
- Hull material
- FG/balsa core deck
- Rig
- Masthead Sloop
Dimensions
- Length overall
- 27′ 10″ (8.47 m)
- Waterline length
- 24′ 4″ (7.41 m)
- Beam
- 9′ (2.74 m)
- Displacement
- 5,500 lb (2,495 kg)
- Ballast
- 2,505 lb (1,136 kg)
Sails and rig
- Sail area
- 366 sq ft (34.0 m²)
- I (foretriangle height)
- 35′ 4″ (10.77 m)
- J (foretriangle base)
- 11′ 6″ (3.49 m)
- P (mainsail luff)
- 31′ (9.45 m)
- E (mainsail foot)
- 9′ 9″ (2.97 m)
Design ratios
- Sail area / displacement
- 18.8
- Displacement / length
- 171
- Ballast ratio
- 46%
- Capsize screening
- 2.04
Power from the sails for the boat's weight. Under 16 is modest, 16–20 a typical cruiser, over 20 lively.
How heavy the boat is for its waterline. Under 200 is light, 200–300 moderate, over 300 heavy.
Share of the weight that is ballast. Higher generally means stiffer in a breeze.
Under 2 is generally considered better for offshore use.
More details
- Ballast Type
- Iron
- Construction
- FG/balsa core deck
Data from Mauri Pro Sailboat Data. Check details with the builder before relying on them.