Beta Marine

Beta Marine

Sailboat Specifications

Definitions
Hull Type: Swing Keel
Rigging Type: Fractional Sloop
LOA: 20.50 ft / 6.25 m
LWL: 16.67 ft / 5.08 m
S.A. (reported): 196.00 ft² / 18.21 m²
Beam: 6.67 ft / 2.03 m
Displacement: 1,100.00 lb / 499 kg
Ballast: 360.00 lb / 163 kg
Max Draft: 4.30 ft / 1.31 m
Min Draft: 0.80 ft / 0.24 m
Construction: FG
Ballast Type: Iron
First Built: 1969
Last Built: 1976
# Built: 500
Builder: Jensen Marine (USA)
Designer: C. William Lapworth

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Sailboat Calculations

Definitions
S.A. / Displ.: 29.49
Bal. / Displ.: 32.73
Disp: / Len: 106.01
Comfort Ratio: 7.61
Capsize Screening Formula: 2.59
S#: 5.95
Hull Speed: 5.47 kn
Pounds/Inch Immersion: 397.29 pounds/inch

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2 nd ad half width

3rd ad full width

Rig and Sail Particulars

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I: 23.00 ft / 7.01 m
J: 8.50 ft / 2.59 m
P: 23.00 ft / 7.01 m
E: 8.50 ft / 2.59 m
S.A. Fore: 97.75 ft² / 9.08 m²
S.A. Main: 97.75 ft² / 9.08 m²
S.A. Total (100% Fore + Main Triangles): 195.50 ft² / 18.16 m²
S.A./Displ. (calc.): 29.41
Est. Forestay Length: 24.52 ft / 7.47 m

Sailboat Links

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

Notes

The CAL 21 was equipped with a swing keel that could be completely raised inside a slot/cavity below the cockpit sole. When the keel was down, a plug was dropped into place to cover the opening and make a flush surface around the keel 'root'. A cable had to be attached or re-attached, to raise or lower the keel.
Besides reducing drag while sailing, the system allowed the hull to sit lower on a trailer.

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