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Boats in this ISAF RSD 'A' Class international ‘open’ class are not limited in length, but are controlled by a formula which demands a balance between waterline length, displacement and sail area.

Sails get smaller as displacement reduces and as waterline length increases.

The formula was devised in 1922 by the editor of the Yachting Monthly as a testing ground for later use in the full sized 5.5 Metre class rule.

Although boats are of a heavy ‘type’ there is more flexibility to create lighter ‘models’. Nevertheless they are big boats and a fleet of radio ‘A’ boats are an impressive and awesome sight!

This class is also keenly free sailed under vane controlled steering.

Approximate sizes

Hull Length 2 metre
Weight 14 to 25 Kilogram
Number of Rigs No Limit