On 13 September 1931 the Schneider Trophy was won outright for Britain on Southampton Water by Flt Lt John Boothman flying Supermarine S6B, S1595, with a record-breaking average speed of 379.08mph. Ralph Pegram relates the story of the Schneider Trophy competitions and describes the development of British high-speed seaplane designs. He examines the anatomy of the S6B (including the Rolls-Royce R engine), as well as giving rare insights into its flying characteristics and how it was maintained, operated and - of course - raced in the final competition.