Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 24.33 ft
LWL: 22.17 ft
S.A. (reported): 230.00 ft²
Beam: 8.17 ft
Displacement: 4,000.00 lb
Ballast: 2,090.00 lb
Max Draft: 3.42 ft
Construction: FG
First Built: 1973
Builder: Challenger Yachts Ltd. (CAN)
Designer: Alex McGruer

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Water: 10 gals

Sailboat Calculations

S.A. / Displ.: 14.64
Bal. / Displ.: 52.25
Disp: / Len: 163.88
Comfort Ratio: 16.50
Capsize Screening Formula: 2.06
S#: 3.04
Hull Speed: 6.31 kn
Pounds/Inch Immersion: 647.19 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 30.00 ft
J: 9.30 ft
P: 24.40 ft
E: 9.30 ft
S.A. Fore: 139.50 ft²
S.A. Main: 113.46 ft²
S.A. Total (100% Fore + Main Triangles): 252.96 ft²
S.A./Displ. (calc.): 16.11
Est. Forestay Length: 31.41 ft
Mast Height from DWL: 32.75 ft

Sailboat Links

Designers: Alex McGruer
Builders: Challenger Yachts Ltd.(CAN)
Related Sailboats: CHALLENGER 7.4
Download Boat Record:


Also known as the CHALLENGER 7.4 or CHALLENGER 7.5. See CHALLENGER 7.4.
Most of the boats are powered by an outboard, although the original design called for a Renault diesel.
Photo courtesy Adam Hunt.