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Farman F.280
The Farman F.280 was a three engine, cantilever wing monoplane designed in France as a mail carrier in the early 1930s. Underpowered and slow, only two were built and briefly used.
==Design and development==
The F.280 was a relative, though not a member of, the F.190/290/390 family of small transport aircraft by its use of a F.190 wing. The high wing was, though, modified to carry two of the F.280's three engines on its upper surface; its span of 14.38 m (47 ft 2 in) made it a smaller aircraft than the near contemporary three engined F.300.〔
Structurally, the wing was built around two spars. Over most of the span the wings had parallel chord but the outermost section, where the ailerons were carried, tapered to straight tips. A pair of parallel aluminium struts inside streamlined spruce fairings took lift and drag loads to the lower fuselage longerons. There were additional vertical struts, small ones as on the F.190 but more sturdy ones under the outboard engines. The empennage of the F.280 was also similar to that of the F.190, with a double strutted rectangular tailplane carrying separate elevators, with a rudder cut-out between them. This deep rudder, tabbed and horn balanced was likewise square edged, mounted on a very wide chord, shallow, straight edged fin.〔
The F.280 had a flat sided fuselage with the pilot's cabin under the wing, the windscreen just forward of the wings, with the third engine mounted in the nose. Square windows lit the interior. The conventional undercarriage had main legs attached vertically to the forward wing struts as extensions of the struts between the latter and the engines and with slimmer bracing to the upper fuselage longerons. Split axles hinged at the lower fuselage centre and radius arms from the lower longerons took the longitudinal loads. The single mainwheels were spatted.〔
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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