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A trapezoidal wing is a straight-edged and tapered wing planform. It may have any aspect ratio and may or may not be swept.〔(Application #43. Trapezoidal High-Lift Wing ), FUN3D (Fully Unstructured Navier-Stokes), NASA (retrieved 30 November 2015)〕〔Ilan Kroo ; AA241 ''Aircraft Design: Synthesis and Analysis'' (''Wing Geometry Definitions'' ), Stanford University. (retrieved 30 November 2015)〕〔G. Dimitriadis; ''Aircraft Design'' (Lecture 2: Aerodynamics ), Université de Liège. (retrieved 30 November 2015)〕 The thin, unswept, short-span, low-aspect-ratio trapezoidal configuration offers some advantages for high-speed flight and has been used on a small number of aircraft types. In this wing configuration the leading edge sweeps back and the trailing edge sweeps forward.〔Gunston, Bill. ''Jane's Aerospace Dictionary''. London, England. Jane's Publishing Company Ltd, 1980. ISBN 0 531 03702 9, Page 436.〕 It can provide low aerodynamic drag at high speeds, while maintaining high strength and stiffness, and was used successfully during the early days of supersonic aircraft. ==Design principles== Any wing with straight leading and trailing edges and with differing root and tip chords is a trapezoid, whether or not it is swept.〔Tom Benson; (''Wing Area'' ), NASA (retrieved 30 November 2015)〕 The area ''A'' of such a trapezoidal wing may be calculated from the span ''s'', root chord ''cr'' and tip chord ''ct'': :: The wing loading ''w'' is then given by the lift ''L'' divided by the area: :: In level flight, the amount of lift is equal to the gross weight. In a straight trapezoidal wing, such as on the Bell X-1, the thickest part of the wing along its span, the line of maximum chord, runs straight out sideways from root to tip. The leading edge then sweeps backwards and the trailing edge sweeps forward.〔 In a swept trapezoidal wing, the line of maximum chord is swept at an angle, usually forward. This increases the sweep of the leading edge and decreases the sweep of the trailing edge, and in the extreme case both edges sweep backwards by different amounts.〔 The transition form, where the trailing edge is straight, is equivalent to a cropped delta planform. 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「Trapezoidal wing」の詳細全文を読む スポンサード リンク
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