High Quality Content by WIKIPEDIA articles! 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. The production of the F.K.31 met with many difficulties. The N.V. Nationale Vliegtuig Industrie was forced to closed down. 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.

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