The Sikorsky S-31 was a 1920s American

United States

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 sesqiuplane designed and built by the Sikorsky Manufacturing Corporation and configured for aerial photography.

Design and development

The S-31 was a sesquiplane built for photographic work by the Fairchild Flying Corporation, it had two open cockpits and a cabin for the photographic equipment. The S-31 was powered by a 200 hp Wright Whirlwind J-4 engine and first flew in September 1925. Following participatiion in the New York Air Races in October 1925 it was shipped to Brazil to be used by Fairchild for aerial photographic work. At some point the S-31 had a twin Lewis machine-guns ring-mounted on the rear cockpit.

Specifications