Supermarine S.5

The Supermarine S.5 was a 1920s British single-engined single-seat racing seaplane built by Supermarine. Designed specifically for the Schneider Trophy competition, the S.5 was the progenitor of a line of racing aircraft that ultimately led to the iconic Supermarine Spitfire fighter of the Second World War

The S.5 was designed by Reginald Mitchell after the loss of the S.4 before it ever raced. It featured extensive changes from the S.4, possessing numerous unconventional features and making greater use of metal; many of these decisions were made to optimise its racing performance. Due to the short development window, a wooden wing was used rather than an all-metal one. In particular, it possessed a relatively low level of drag for the era.

On 7 June 1927, the first S.5 performed its maiden flight; a total of three aircraft were built. Two S.5s came in 1st and 2nd places at the 1927 Schneider Trophy contest; the type would also participate in the event during subsequent years. On 12 March 1928, one S.5 fatally crashed during an attempt on the world air speed record, killing the pilot Flight Lieutenant Samuel Kinkead. During the 1970s, a full-scale flight-worthy S.5 replica was constructed.