Re: "Frise-type" ailerons...

From:         Martin Holloway <100551.2537@CompuServe.COM>
Organization: via CompuServe Information Service
Date:         15 Jun 95 01:13:59 
References:   1
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<Are "frise" ailerons different from the usual up-down
articulated flap at end
of wing thing that I've grown comfortable with after all these
years?>

Yes.
Frise ailerons are designed to reduce adverse aileron yaw. The
lower trailing edge of the aileron is made to protrude into the
airflow when the surface is deflected upwards, thus equalising
drag produced by the down going aileron on the opposite wing.
Most aircrfat with Frise ailerons also have some differential
movement as well eg. C150/C172.

Martin Holloway