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A convertiplane in popular usage is an aircraft that converts in flight to change its method of obtaining lift. The FAI define it more narrowly as an aircraft which uses rotor power for vertical takeoff and landing (VTOL) and converts to fixed-wing lift in normal flight.〔Green, W., ''The Observer's world aircraft directory'', Warne, 1961, Page 134.〕 This is the definition used here. ==Types of convertiplane== Convertiplanes may be divided into two broad classes, based on whether the rotor is fixed as in a helicopter or tilts to provide thrust in forward flight, as a proprotor. A proprotor may be in a tilt rotor or tilt wing configuration in which case a fairly complicated tilt mechanism is required. An engine failure could be disastrous even in the case of twin rotor configuration,〔(Dictionary : V/STOL_Technology )〕 similarly to helicopters. In most cases gyroplanes and compound helicopters use the same primary method of lift throughout flight without any conversion needed, so they are generally not regarded as convertiplanes. However, at least two aircraft did achieve a winglift higher than their rotorlift : * McDonnell XV-1 85% \ 15% 〔Robb 2006, page 41〕〔Harris 2003. Lift forces at page 19 or A-101〕 * Fairey Rotodyne 60% \ 40% 〔Braas, Nico. "(Fairey Rotodyne )" ''Let Let Let Warplanes,'' 15 June 2008. Accessed: April 2014.〕 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「Convertiplane」の詳細全文を読む スポンサード リンク
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