Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 38.67 ft
LWL: 31.25 ft
S.A. (reported): 738.00 ft²
Beam: 11.67 ft
Displacement: 14,600.00 lb
Ballast: 6,600.00 lb
Max Draft: 6.00 ft
Construction: FG (solid laminate)
Ballast Type: Lead
First Built: 1970
Last Built: 1971
# Built: 29
Builder: Jensen Marine (USA)
Designer: C. William Lapworth

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4108
Type: Diesel
Fuel: 35 gals


Water: 64 gals

Sailboat Calculations

S.A. / Displ.: 19.84
Bal. / Displ.: 45.21
Disp: / Len: 213.58
Comfort Ratio: 25.56
Capsize Screening Formula: 1.91
S#: 2.85
Hull Speed: 7.49 kn
Pounds/Inch Immersion: 1,303.07 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 50.00 ft
J: 17.00 ft
P: 41.75 ft
E: 15.00 ft
S.A. Fore: 425.00 ft²
S.A. Main: 313.13 ft²
S.A. Total (100% Fore + Main Triangles): 738.13 ft²
S.A./Displ. (calc.): 19.84
Est. Forestay Length: 52.81 ft

Sailboat Links

Designers: C. William Lapworth
Builders: Bangor Punta Corp.
Jensen Marine/Cal Boats
Download Boat Record:


This, the first of several CAL 39's, was introduced just before the adoption of the IOR, (replacing the CCA rule) which may have caused sales to falter in the first year. It was soon replaced with another version, the CAL 39 MII (1979), an entirely new design, also by Lapworth, and one that, presumably, the rule treated more kindly.
Yet another, completely different CAL 39 was introduced in 1988, this time designed by Hunt and Associates, of which, relatively few were built.

Deep Draft: 6.50'/1.98m (ballast +600 lbs.)
Tall Rig:
I: 54.00'/16.46m
J: 17.00'/5.18m
P: 45.60'/13.90m
E: 15.00'/4.57m
Upwind/working SA: 801 ft2/74.41 m2
Thanks to Gay Morris for images and corrected information concerning the different versions of the CAL 39.