Sikorsky S-7

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Sikorsky S-7 aircraft front circa 1912.jpg
Sikorsky S-7 circa 1912
Role Experimental
National origin Russian Empire
Manufacturer Russian Baltic Railroad Car Works
Designer Igor Sikorsky
First flight July 1912
Number built 1
S-7 view from aft

The Sikorsky S-7 was a Russian single engine experimental prototype aircraft built by the Russian Baltic Railroad Car Works shortly after Igor Sikorsky became chief engineer of the aircraft manufacturing division.

Design and development[edit]

The S-7 was two-seater wire-braced monoplane powered by a 70 hp (52 kW) Gnome air-cooled rotary engine. Construction began in early summer of 1912 and completed in July. The pilot sat in the rear cockpit with a passenger seated in a forward compartment in a tandem arrangement. The fuselage was enclosed in plywood and the aircraft used components taken from the S-6A including the main wing, tail and landing gear.[1][2]

Operational history[edit]

The S-7 was entered in the international military competition at Saint Petersburg in August 1912. During a take-off attempt from a furrowed field the landing gear was severely damaged and the S-7 was unable to finish the completion. In 1913 the aircraft was repaired and served as a trainer. In 1914 Bulgaria purchased the S-7 and used it in operations during World War I.[2][1]


Data from Russian Aviation Museum[3]

General characteristics

  • Crew: One
  • Capacity: One passenger
  • Length: 26 ft 11 in (8.2 m)
  • Upper wingspan: 32 ft 10 in (10 m)
  • Wing area: 220 sq ft (20 m2)
  • Empty weight: 990 lb (449 kg)
  • Gross weight: 1,711 lb (776 kg)
  • Powerplant: 1 × Gnome Lambda 7-cylinder air-cooled rotary piston engine, 70 hp (52 kW)


  • Maximum speed: 67 mph; 58 kn (108 km/h)


  1. ^ a b Sikorsky, Igor (1944). The Story of the Winged-S. New York: Dodd, Mead & Company. p. 43. ISBN 9781258163556.
  2. ^ a b "Sikorsky S-7 1911". Retrieved 5 April 2017.
  3. ^ "S-7". 4 September 1997. Retrieved 2 April 2017.