| 翻訳と辞書 |
adverse yaw
Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll. It is caused by the difference in profile drag between the upward and downward deflected ailerons, the difference in lift and thus induced drag between left and right wings, as well as an opposite rotation of each wing's lift vector about the pitch axis due to the rolling trajectory of the aircraft. The effect can be greatly minimized with ailerons or other mechanisms deliberately designed to create more drag when deflected upward than downward and/or mechanisms which automatically apply some amount of coordinated rudder. As the major causes of adverse yaw vary with lift, any fixed-ratio mechanism will fail to fully solve the problem across all flight conditions and thus any manually operated aircraft will require some amount of rudder input from the pilot in order to maintain coordinated flight.
== Causes ==
Adverse yaw is a secondary effect of the inclination of the lift vectors on the wing due to its rolling velocity and of the application of the ailerons.〔Perkins, Courtland; Hage, Robert (1949). ''Airplane performance, stability and control''. John Wiley and Sons. ISBN 0-471-68046-X.〕 Some pilot training manuals focus mainly on the additional drag caused by the downward-deflected aileron〔Langewiesche, Wolfgang (1944). ''Stick and Rudder''. McGraw-Hill. pp. 163-165. ISBN 0-07-036240-8.〕〔(''Pilot's Handbook of Aeronautical Knowledge Ch. 5'' ), Federal Aviation Administration, 2008, p. 5-3, retrieved 2012-12-12〕
and make only brief or indirect mentions of roll effects. In fact the rolling of the wings usually causes a greater effect than the ailerons. Assuming a roll rate to the right, as in the diagram, the causes are explained as follows:
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「adverse yaw」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|