What is the main purpose of a frise aileron?
- Increase drag on the up going aileron.
- Decrease drag on the up going wing.
- Help pilot overcome aerodynamic loads.
Explanation from PART66Online
A Frise aileron is hinged behind its leading edge, so when it is raised its nose projects below the wing into the airflow and adds drag on that aileron, on the down-going wing. This balances the drag of the lowered aileron on the up-going wing and reduces adverse yaw. More drag on the up-going wing would worsen adverse yaw, and the drag is added to the other wing rather than removed from the up-going one. The nose also lightens stick forces, but countering adverse yaw is its stated purpose.
Apavlenko asked · 18 Sep 2015
Not correct answer. avstop.com/ac/flighttrainghandbook/di...:
The design of the aileron surface itself has also been improved by the "Frise type" aileron. With this type of aileron, when pressure on the control stick or wheel is applied to one side, raising one of the ailerons, the leading edge of that aileron (which has an offset hinge) projects down into the airflow and creates drag. This helps equalize the drag created by the lowered aileron on the opposite wing and thus reduces adverse yaw (Fig. 4-5).
Community Comments (3)
The drag on the down going aileron (up-going wing) is reduced
en.wikipedia.org/wiki/Adverse_yaw
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