Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Centerboard Dinghy
Rigging Type: Fractional Sloop
LOA: 14.75 ft / 4.50 m
LWL: 14.00 ft / 4.27 m
S.A. (reported): 120.00 ft² / 11.15 m²
Beam: 5.67 ft / 1.73 m
Displacement: 240.00 lb / 109 kg
Max Draft: 4.00 ft / 1.22 m
Min Draft: 0.70 ft / 0.21 m
Construction: Wood/FG
First Built: 1963
# Built: 700
Builder: South Devon Boatbuilders (UK)/others
Designer: John Vincent Kelley/Stan Herbert

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Sailboat Calculations

S.A. / Displ.: 49.76
Disp: / Len: 39.05
Comfort Ratio: 2.58
Capsize Screening Formula: 3.65
Hull Speed: 5.01 kn
Pounds/Inch Immersion: 283.63 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Sailboat Links

Builders: Zygal Boats (UK)
Associations: Seafly Sailing Dinghy (UK)
Related Sailboats: MAYFLY
Download Boat Record:


Spinnaker: 135 sq.ft.
Other builders:
Zygal Boats
Moores of Wroxham

Successor to the earlier, slightly smaller MAYFLY.

The Seafly web site is exceedingly thorough about the history of the class.
(Number built is a very loose estimate.)