Design and Development
The Supermarine S.4 was designed by R. J. Mitchell to compete in the 1925 Schneider Trophy race. Built by Supermarine at Woolston, the S.4 was primarily an all-wooden monoplane seaplane, although a mixed wood-metal construction fuselage was mated to an unbraced cantilever wing and monocoque fuselage, powered by a 680 hp (507 kW) Napier Lion VII engine. As an exceptionally "clean" monoplane seaplane, the S.4 design was in marked contrast to the biplane Supermarine Sea Lion flying boats which Mitchell had designed for previous Schneider Trophy races, which won in 1922 and came third behind the American Curtiss CR seaplanes in 1923.
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