NVI F.K.31

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Role Reconnaissance-fighter
Manufacturer Nationale Vliegtuig Industrie
First flight June 1923
Introduction 1925
Retired 1927
Primary user Finnish Air Force
Number built 17

NVI F.K.31 was a Dutch designed, two seat reconnaissance-fighter, which was developed in the 1920s by Frederick Koolhoven. The aircraft was equipped with an enclosed cockpit and single-strut landing gear. Only a small number of aircraft were produced. The aircraft saw some service in the Finnish Air Force.


The F.K.31 became Koolhoven's first design for the N.V. Nationale Vliegtuig Industrie ("National Aircraft Industry") a two seat scout and fighter. Its prototype became the sensation of the Paris Air Salon of 1922. However, the production of the F.K.31 met with many difficulties, forcing the N.V. Nationale Vliegtuig Industrie to close down.

Use in Finland[edit]

The Finnish Air Force used twelve F.K.31s between 1925-27. The aircraft had been purchased while the development still was being carried out. The Finnish pilots disliked the aircraft and it has been considered the worst aircraft of the FAF. The F.K.31s flew for fewer than 6 hours in the Finnish Air Force.



Specifications (F.K.31)[edit]

Data from {KOOLHOVEN FK 31}[1]

General characteristics



  • 2 × 7.7 mm machine guns


  1. ^ "KOOLHOVEN FK 31". Retrieved 2007-01-19. 
  • Green, William; Gordon Swanborough (1994). The Complete Book of Fighters. New York: Smithmark. ISBN 0-8317-3939-8.