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In aeronautics downwash is the change in direction of air deflected by the aerodynamic action of an airfoil, wing or helicopter rotor blade in motion, as part of the process of producing lift.〔Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', page 172. Aviation Supplies & Academics, 1997. ISBN 1-56027-287-2〕 Lift on airfoil is an example of application of Newton's third law of motion - the force required to create the downwash is equal in magnitude and opposite in direction to the lift force on the airfoil. Lift on an airfoil is also an example of the Kutta-Joukowski theorem - the Kutta condition explains the existence of downwash at the trailing edge of the wing.〔〔"The main fact of all heaver-than-air flight is this: ''the wing keeps the airplane up by pushing the air down.''" In: 〕 〔(【引用サイトリンク】title=Downwash Effects on Lift )〕 ==See also== * Slipstream * Wake turbulence * Wingtip vortices 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「downwash」の詳細全文を読む スポンサード リンク
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