aileron drag

aileron drag
The yawing effect caused by the asymmetric drag of ailerons. Though present at all angles of attack, it becomes prominent at the stalling angle. The down-going aileron is normally deflected through a greater angle than the up-going ailerons; hence, the differential drag they produce results in the yaw.
Rising wing has increased aileron drag resulting in adverse yaw.

Aviation dictionary. 2014.

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