Question

What do frise ailerons do?

A) Increase lift during turns
B) Reduce drag during level flight
C) Decrease stability during banking
D) Minimize adverse yaw

Answer 1

Frise ailerons are used on aircraft to minimize adverse yaw, which is an undesirable effect that occurs when an aircraft rolls in one direction and yaws in the opposite one during a turn.

Step-by-step explanation:

Frise ailerons are implemented on aircraft to control roll and to minimize adverse yaw. Adverse yaw is a secondary effect of aileron usage, where the aircraft yaws in the opposite direction to the turn, caused by the differential drag and lift induced when the ailerons are deflected. Frise ailerons combat this by having a portion of the aileron surface project into the airflow on the down-going wing, increasing drag on that wing, and thus helping to counteract adverse yaw. The correct answer to 'What do frise ailerons do?' is D) Minimize adverse yaw.