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Fokker F.IX
The Fokker F.IX was an airliner developed in the Netherlands in the late 1920s, intended to provide KLM with an aircraft suitable for regular services to the Dutch East Indies. When the onset of the Great Depression forced the postponement of those plans, the market for this aircraft disappeared as well, although it did see military service in Czechoslovakia as a bomber.
==Design and development==
The F.IX was a three-engine, high-wing monoplane of conventional configuration, equipped with tailskid undercarriage. The wings were made of wood, and the fuselage was welded steel tube with a fabric covering. When presented at the 1930 Paris Air Show, it won the ''Grand Prix de Comfort et d'Elegance d'Avions de Transport'' - the "beauty prize" as voted by the public.
Czech aircraft manufacturer Avia purchased a licence to produce the type in order to create a bomber for the Czechoslovakian Air Force, when it was decided that the Fokker F.VII that Avia was already producing under licence was too small for this role. By 1932, 12 were in service as the F.39. Yugoslavia also purchased two aircraft, as well as a licence to produce the type domestically, although this did not eventuate. The F.39s differed from their civil counterparts not only in the addition of bomb racks, but also in a defensive machine gun being fitted to either a ventral "step" or a turret. Avia also built two examples as airliners for Czechoslovakian Airlines as the F.IX D (''Dopravni'' - "transport"). One of these survived into World War II, when it was impressed into ''Luftwaffe'' service (as ''TF+BO'').〔Taylor 1989, p. 88.〕
A further proposed military development by Avia, the two-engine F.139, never left the drawing board.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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