Length: 3.90m (12ft 10ins)
Width: 1.68m (5ft 6ins)
Country: United Kingdom
Keel Type:
Rig Type:
Bermuda Sloop Fractional (with jib)
Crew: 2
Trapeze: none
Sail Area: 8.6 sq. m
Spinnaker Type:
Symmetric spinnaker
Spinnaker Area:
8.9 sq.m
Design Year: 1957
Boats Built:
No handicap data found

The Mayfly was originally built by South Devon Boat Builders in Dawlish, Devon, UK. Other builders included Elders of Troon and Moores of Wroxham.

The Mayfly was a 12’9″ (3.89m) one design hard-chine dinghy designed in 1956 by J.V.Kelley. It had a 90 sq.ft (8.36m2) rig with an optional spinnaker of the same area. Two deck layouts were offered. Standard was a “rolled” deck” …a very modern innovation. The more conventional “Clubman” version featured side seats and a small gunwhale deck. The designer, John Kelley, had successfully designed (and helmed) dinghies in the very competitive National 12 and National 14 “development” classes.


No class association known
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