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The Koolhoven F.K.51 was a 1930s Dutch two-seat basic training biplane built by the Koolhoven Company. ==Design and development== The Koolhoven F.K.51 was the winning design in a 1935 Dutch government contest for a new trainer. Designed by Frederick Koolhoven the prototype biplane trainer first flew on 25 May 1935. The aircraft was an equal-span biplane designed to use a variety of engines between 250 hp (186 kW) and 500 hp (373 kW). It was a two-seater and had a fixed tailwheel undercarriage. The Royal Netherlands Air Force (LVA) ordered 25 aircraft in 1936 and 1937, powered by a 270 hp (201 kW) Armstrong Siddeley Cheetah V radial engine. A further 29 aircraft were later ordered with 350 hp (261 kW) Armstrong Siddeley Cheetah IX engine. The Dutch Naval Aviation Service ordered 29 aircraft each powered by a 450 hp (335 kW) Pratt & Whitney radials. The Royal Dutch East Indies Army bought 38 aircraft between 1936 and 1938 each powered by a 420 hp (313 kW) Wright Whirlwind. The Spanish Republican government ordered 28 F.K.51s, 11 with 400 hp (298 kW) Armstrong Siddeley Jaguar IVa radials and 17 aircraft (designated F.K.51bis) each powered by a 450 hp (335 kW) Wright Whirlwind R-975E radials. Production totaled at least 142 aircraft. Twenty-four fuselages of the F.K.51 were assembled at Aviolanda. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Koolhoven F.K.51」の詳細全文を読む スポンサード リンク
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