Sikorsky S-20

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Role Fighter
Manufacturer RBVZ (Russo-Baltic Wagon Works)
Designer Igor Sikorsky
First flight 1916
Introduction 1916
Retired 1920
Primary user Imperial Russian Air Service
Number built 5

The Sikorsky S-20 (named after its designer) or RBVZ S-XX (named after its manufacturer) was a Russian single-bay unequal span two-seat biplane designed by Igor Sikorsky in 1916. Displaying some Nieuport influence, it saw very little service during World War I.

Five S-XX aircraft were built in September 1916, with the first two powered by the 100 hp Gnome rotary engine which had powered its predecessor, the RBVZ S-XVI. However, the other three were powered with the 120 hp Le Rhone engine, with which they were allegedly faster than the French Nieuport 17.

Operational history[edit]

The S-XX saw little service because it was viewed as inferior to newer enemy aircraft, and no series production was undertaken. As such, only five aircraft were ever produced.

List of operators[edit]

 Russian Empire


General characteristics

  • Crew: Two
  • Length: 6.50m (21 ft 3⅞ in)
  • Wingspan: 8.60m (28 ft 2½ in)
  • Height: m ()
  • Wing area: 17m² (182.99 ft²)
  • Empty weight: 395 kg (871 lb)
  • Loaded weight: 570 kg (1,257 lb)
  • Powerplant: 1 × 120hp Le Rhône air-cooled rotary engine, 90 kW (120 hp)


  • Maximum speed: 190 km/h (118 mph)
  • Endurance:
  • Climb to 2,000 m (6,560 ft): 6.33 min


  • Guns: 1 x 7.7 mm Lavrov machine gun




  • William Green and Gordon Swanborough. The Complete Book of Fighters. Colour Library Direct, Godalming, UK: 1994. ISBN 1-85833-777-1.