Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 8.53 m
LWL: 6.86 m
S.A. (reported): 37.16 m²
Beam: 2.90 m
Displacement: 3,447 kg
Ballast: 1,361 kg
Max Draft: 1.37 m
Construction: FG
Ballast Type: Lead
First Built: 1980
Last Built: 1983
# Built: 103
Builder: S-2 Yachts
Designer: Arthur Edmunds

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Yanmar
Model: 1GM
Type: Diesel
HP: 8
Fuel: 68 L


Water: 140 L
Headroom: 1.83 m

Sailboat Calculations

S.A. / Displ.: 16.61
Bal. / Displ.: 39.47
Disp: / Len: 297.86
Comfort Ratio: 24.24
Capsize Screening Formula: 1.94
S#: 1.70
Hull Speed: 6.36 kn
Pounds/Inch Immersion: 763.75 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 11.28 m
J: 3.35 m
P: 9.45 m
E: 3.66 m
S.A. Fore: 18.91 m²
S.A. Main: 17.28 m²
S.A. Total (100% Fore + Main Triangles): 36.19 m²
S.A./Displ. (calc.): 16.17
Est. Forestay Length: 11.77 m
Mast Height from DWL: 12.50 m

Sailboat Links

Designers: Arthur Edmunds
Builders: S2 Yachts (USA)
Download Boat Record:


Also called the 8.5A
A few early boats were fitted with a BMW diesel.
Shoal draft: 3.92'.