Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Staysail Ketch
LOA: 39.37 ft
LWL: 37.57 ft
S.A. (reported): 764.00 ft²
Beam: 11.25 ft
Displacement: 26,455.00 lb
Ballast: 9,920.00 lb
Max Draft: 6.07 ft
Construction: FG
First Built: 1973
# Built: 8
Builder: Alpa (ITA)
Designer: Sparkman & Stephens

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Diesel
Model: Perkins
Fuel: 53 gals


Water: 106 gals

Sailboat Calculations

S.A. / Displ.: 13.82
Bal. / Displ.: 37.50
Disp: / Len: 222.71
Comfort Ratio: 42.71
Capsize Screening Formula: 1.51
S#: 1.80
Hull Speed: 8.21 kn
Pounds/Inch Immersion: 1,510.22 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 48.25 ft
J: 14.50 ft
P: 42.86 ft
E: 13.75 ft
PY: 26.75 ft
EY: 9.00 ft
S.A. Fore: 349.81 ft²
S.A. Main: 294.66 ft²
S.A. Total (100% Fore + Main Triangles): 644.47 ft²
S.A./Displ. (calc.): 11.66
Est. Forestay Length: 50.38 ft

Sailboat Links

Designers: Sparkman & Stephens
Builders: Alpa Yachts (ITA)
Download Boat Record:


From the same hull mold used to built the ALPA 12.7 (1969).
The tooling was later purchased by the Zuanelli yard where, with a few modifications, it became the Zuanelli 42.