Farman F.31

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Role Fighter
National origin France
Manufacturer Farman
Designer Henry Farman
First flight Summer 1918
Number built 1

The Farman F.31 was a French fighter prototype of the 1910s, the second foray into fighter design by Farman, a firm more usually associated with bombers. The project was short-lived, lasting only 3 months.


The F.31 was a two-seat fighter, designed around the Liberty 12 engine. It was exceptionally angular, and equi-span with the fuselage mounted between its two bays.

Operational history[edit]

The sole prototype was completed and first flown in summer 1918. Testing was still ongoing in November 1918, when the Armistice put an end to the project and no further development continued.


Data from Green & Swanborough, page 202

General characteristics

  • Crew: 2
  • Length: 7.35 m (24 ft 1 in)
  • Wingspan: 11.76 m (38 ft 6 in)
  • Height: 2.58 m (8 ft 9 in)
  • Empty weight: 869 kg (1916 lb)
  • Gross weight: 1469 kg (3239 lb)
  • Powerplant: 1 × Liberty 12 12-cylinder water-cooled engine, 298 kW (400 hp)


  • Maximum speed: 215 km/h (134 mph)



  • Green, William; Gordon Swanborough. The Complete Book of Fighters. Godalming, UK: Salamander Books. p. 415.