Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 11.99 m
LWL: 9.24 m
S.A. (reported): 65.03 m²
Beam: 3.35 m
Displacement: 6,804 kg
Ballast: 2,722 kg
Max Draft: 1.70 m
Construction: FG
Ballast Type: Lead
First Built: 1963
Last Built: 1971
# Built: 108
Builder: Jensen Marine (USA)
Designer: C. William Lapworth

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4108
Type: Diesel
HP: 50

Sailboat Calculations

S.A. / Displ.: 18.48
Bal. / Displ.: 40.00
Disp: / Len: 240.01
Comfort Ratio: 28.79
Capsize Screening Formula: 1.79
S#: 2.41
Hull Speed: 7.38 kn
Pounds/Inch Immersion: 1,192.10 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 14.02 m
J: 4.62 m
P: 12.19 m
E: 5.33 m
S.A. Fore: 32.41 m²
S.A. Main: 32.52 m²
S.A. Total (100% Fore + Main Triangles): 64.93 m²
S.A./Displ. (calc.): 18.45
Est. Forestay Length: 14.76 m

Sailboat Links

Designers: C. William Lapworth
Builders: Jensen Marine/Cal Boats
Associations: Cal 40 Forum
Cal 40 Site
Download Boat Record:


The rig dimensions above are from the 1963 sail plan drawing. Current class rules (2005) allow a max of:
I - 46.7'
J - 15.3'
P - 40.1'
E - 17.55'

The accolades for this particular boat are many. Certainly one of the most influential designs and successful racing boats ever. With 160 built, it was also a commercial success for Jensen Marine.
Less mention is made of the man, George Griffith, who actually commissioned the design, and agreed to back the construction of the first ten boats.

This added note from Robert VanderPol II:
"There is a single example of a raised deck Cal 40 similar to the Cal 25 & 28. Jensen Marine was promised a number of orders. All but one backed out at the last minute and only one was built and delivered."