Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 45.50 ft
LWL: 37.50 ft
S.A. (reported): 827.00 ft²
Beam: 12.50 ft
Displacement: 30,000.00 lb
Ballast: 8,000.00 lb
Max Draft: 5.00 ft
Construction: FG
First Built: 1967
Last Built: 1972
# Built: 18
Builder: Jensen Marine (USA)
Designer: C. William Lapworth

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4-236
Type: Diesel
HP: 85
Fuel: 270 gals


Water: 170 gals

Sailboat Calculations

S.A. / Displ.: 13.76
Bal. / Displ.: 26.67
Disp: / Len: 253.97
Comfort Ratio: 40.21
Capsize Screening Formula: 1.61
S#: 1.81
Hull Speed: 8.21 kn
Pounds/Inch Immersion: 1,674.90 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 47.50 ft
J: 20.50 ft
P: 40.00 ft
E: 17.00 ft
S.A. Fore: 486.88 ft²
S.A. Main: 340.00 ft²
S.A. Total (100% Fore + Main Triangles): 826.88 ft²
S.A./Displ. (calc.): 13.76
Est. Forestay Length: 51.73 ft

Sailboat Links

Designers: C. William Lapworth
Builders: Jensen Marine/Cal Boats
Related Sailboats: CAL 2-46
Download Boat Record:


When sales of this first version of Cal's 46 foot cruising ketch proved disappointing, (18 built) it was decided to completely redesign the interior. For the updated model (called the CAL 2-46), the engine room was moved forward, the aft cabin even further aft. The main salon and the forward cabin were enlarged. Bill Lapworth has stated that this was a favorite of all his designs and a yacht that he actually owned. The boat went through a third iteration in the mid-'70's that included smaller cabin windows and other changes to the interior. This was the CAL 3-46 (or "Mark III's"). All the 46's used the same hull. (see CAL 2-46)
(Previously listed as CAL 46 MS)