Koolhoven F.K.56
The Koolhoven F.K.56 was a 1930s Dutch basic training monoplane designed and built by Koolhoven.[1]
Development
The F.K.56 was a low-wing monoplane powered by a 450 hp (336 kW) Wright Whirlwind R-975-E3 radial piston engine.[1] Designed as a basic trainer, the F.K.56 had two seats in tandem for the instructor and pupil under a fully enclosed canopy.[1] The first prototype flew on 30 June 1938 and had fixed conventional landing gear and a gull wing.[1] The second prototype had retractable landing gear and was powered by a Script error: No such module "convert". Armstrong Siddeley Cheetah X engine.[2] Testing showed that the aircraft was too stable for use as a training aircraft, while the gull wing was too complex for mass production. A new, un-gulled, wing, based on that of the Koolhoven F.K.58 fighter was therefore designed, which was incorporated in a third prototype, which reverted to the Whirlwind engine and was fitted with dual controls.[1][2] The third prototype flew on 5 December 1939.[2]
Ten aircraft were ordered by the Netherlands Army based on the design of the third prototype.[1] These ten, including the re-worked first and third prototypes, were all delivered before the German invasion of the Netherlands in May 1940.[1]
Earlier in February 1940 the Belgians had ordered twenty F.K.56 basic trainers and seven had been delivered before the rest were destroyed in an air raid on the Waalhaven factory.[1]
Operators
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Specifications
Data from [1]
General characteristics
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References
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Notes
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Bibliography
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