Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 7.42 m
LWL: 6.76 m
S.A. (reported): 21.37 m²
Beam: 2.49 m
Displacement: 1,814 kg
Ballast: 948 kg
Max Draft: 1.04 m
Construction: FG
First Built: 1973
Builder: Challenger Yachts Ltd. (CAN)
Designer: Alex McGruer

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Water: 38 L

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: 9.14 m
J: 2.83 m
P: 7.44 m
E: 2.83 m
S.A. Fore: 12.96 m²
S.A. Main: 10.54 m²
S.A. Total (100% Fore + Main Triangles): 23.50 m²
S.A./Displ. (calc.): 16.11
Est. Forestay Length: 9.57 m
Mast Height from DWL: 9.98 m

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.