Alpa 42
Sailboat
39′ 5″
Since 1973
Overview
- Builder
- Alpa
- Model
- 42
- Type
- Sailboat
- Built
- 1973 on
- Designer
- Sparkman & Stephens
- Hull
- Fin with rudder on skeg
- Hull material
- Fiberglass
- Rig
- Staysail Ketch
Dimensions
- Length overall
- 39′ 5″ (12.01 m)
- Waterline length
- 37′ 7″ (11.46 m)
- Beam
- 11′ 4″ (3.44 m)
- Displacement
- 26,455 lb (12,000 kg)
- Ballast
- 9,920 lb (4,500 kg)
Sails and rig
- Sail area
- 668 sq ft (62.1 m²)
- I (foretriangle height)
- 48′ 3″ (14.71 m)
- J (foretriangle base)
- 14′ 6″ (4.42 m)
- P (mainsail luff)
- 42′ 10″ (13.06 m)
- E (mainsail foot)
- 13′ 9″ (4.19 m)
Design ratios
- Sail area / displacement
- 12.0
- Displacement / length
- 222
- Ballast ratio
- 37%
- Capsize screening
- 1.52
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
- Construction
- FG
Data from Mauri Pro Sailboat Data. Check details with the builder before relying on them.