Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Fractional Sloop
LOA: 34.00 ft
LWL: 29.53 ft
S.A. (reported): 580.00 ft²
Beam: 11.20 ft
Displacement: 7,850.00 lb
Ballast: 2,470.00 lb
Max Draft: 6.50 ft
Construction: FG
First Built: 1983
# Built: 15
Builder: Marine Glass (UK)
Designer: Rob Humphreys

Auxiliary Power/Tanks (orig. equip.)

Make: Yanmar
Model: 2GM20
Type: Diesel

Sailboat Calculations

S.A. / Displ.: 23.57
Bal. / Displ.: 31.46
Disp: / Len: 136.09
Comfort Ratio: 15.74
Capsize Screening Formula: 2.26
S#: 4.29
Hull Speed: 7.28 kn
Pounds/Inch Immersion: 1,181.76 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 38.71 ft
J: 11.00 ft
P: 42.07 ft
E: 15.50 ft
S.A. Fore: 212.91 ft²
S.A. Main: 326.04 ft²
S.A. Total (100% Fore + Main Triangles): 538.95 ft²
S.A./Displ. (calc.): 21.90
Est. Forestay Length: 40.24 ft

Sailboat Links

Designers: Rob Humphreys
Builders: Northshore Yachts (UK)
Associations: IOR 3/4 ton
Download Boat Record:


Based on an IOR 3/4 ton design 'Roller Skate' (1982). (Prototype was 'Seren Wib')
Available in Grand Prix or Racer/Cruisers versions. A number of other boats were built to this design besides this one from MG.