Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 11.45 m
LWL: 8.99 m
S.A. (reported): 69.21 m²
Beam: 3.43 m
Displacement: 7,838 kg
Max Draft: 1.62 m
Construction: FG
First Built: 1977
# Built: 63
Builder: Rival/Southern Boatbuilding Co. Ltd. (UK)
Designer: Peter Brett

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Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4.108
Type: Diesel
HP: 38
Fuel: 492 L


Water: 416 L

Sailboat Calculations

S.A. / Displ.: 17.90
Disp: / Len: 300.49
Comfort Ratio: 33.30
Capsize Screening Formula: 1.74
S#: 1.55
Hull Speed: 7.28 kn
Pounds/Inch Immersion: 1,185.83 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 14.75 m
J: 4.37 m
P: 11.46 m
E: 4.19 m
S.A. Fore: 32.22 m²
S.A. Main: 24.02 m²
S.A. Total (100% Fore + Main Triangles): 56.23 m²
S.A./Displ. (calc.): 14.54
Est. Forestay Length: 15.39 m

Sailboat Links

Designers: Peter Brett
Builders: Marine Construction Ltd. (UK)
Associations: Rival Owners Association
Download Boat Record:


The standard version (RIVAL 38A) has an aft cockpit. Some of these were rigged as Cutters. A center cockpit version was also available, as was a ketch rig. See the Rival Owners Site for more details.