Beta Marine

Sailboat Specifications

Hull Type: Lifting Keel
Rigging Type: Fractional Sloop
LOA: 16.75 ft / 5.11 m
LWL: 15.00 ft / 4.57 m
S.A. (reported): 165.00 ft² / 15.33 m²
Beam: 6.25 ft / 1.91 m
Displacement: 620.00 lb / 281 kg
Ballast: 250.00 lb / 113 kg
Max Draft: 3.92 ft / 1.19 m
Min Draft: 0.92 ft / 0.28 m
Construction: FG
First Built: 1968
Builder: O'Day Corp. (USA)/ Gmach & Co. (UK)
Designer: Ian Proctor

Sailboat Calculations

S.A. / Displ.: 36.36
Bal. / Displ.: 40.32
Disp: / Len: 82.01
Comfort Ratio: 5.37
Capsize Screening Formula: 2.93
Hull Speed: 5.19 kn
Pounds/Inch Immersion: 334.98 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Sailboat Links


This boat features a hollow daggerboard secured in place by a hatch. Ballast is lowered into the keel using small bags of lead shot. It's unknown how similar to the orginal version the later O'Day model is. Thanks to the folks at for providing information on the WILDFIRE as well as some other English boats of this era. (Another boat that has a similar feature is the Milne designed VULCAN.)