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Modified Frise style ailerons

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luked

Member
Joined
Mar 27, 2013
Messages
23
Location
Albany
My understanding is that Frise type ailerons provide two main benefits. First, as the trailing edge rises, the leading edge dips down into the airflow below the wing, and increases drag to help counter adverse yaw. Also, that drag can help counter the hinge moment and decrease stick forces.

In most Frise type ailerons I've seen, the leading edge nose or point extends the full span of the aileron. I'm wondering if there are any examples where this feature is only on the outboard portion.

My thought was that the further outboard the drag is created, the more benefit it provides in terms of countering adverse yaw. Less helpful drag (inboard) could be eliminated. As for lightening stick forces, it wouldn't seem to matter (other than torsional stiffness maybe).

There must be a good reason this isn't common. My first thought is that it's not worth the trouble on most designs because the drag only occurs when ailerons are moved from the neutral position. Are there some negative effects I'm not thinking of?

Thanks,
Luke D.
 
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