Since I first bought a computer radio, I've set up almost all my aileron-elevator 
slopers with spoilerons for landing.  All these planes required some amount of up 
elevator compensation to keep the nose level when the spoilerons were deployed.  I 
always assumed this was just because of the reduced lift on the wing, or perhaps some 
pitching moment being created by the spoilerons being deployed.  

All these planes had strip ailerons though.  In the last year, I've built 3 airplanes 
that have only tip ailerons and no flaps.  These are wildly different airplanes with 
different planforms, spans, and airfoils, but they all share one thing in common: with 
spoilerons deployed, they need absolutely no elevator compensation...they stay 
perfectly level.  

Now I'm wondering if the pitch change in the strip aileron models is actually due to 
the spoilerons blanketing or otherwise affecting the airflow over the horizontal stab, 
rather then just some pitching moment caused by the wing.

I'm just curious about this...any thoughts?
-- 
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Brett Jaffee
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R/C Slope and Power Homepage
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