Old 11-20-2009, 12:37 AM
  #69  
quorneng
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Differential ailerons - more "up" than "down". This means more drag on the up (inside) aileron than on the down (outside) so it helps the plane into a turn.
Equal up and down ailerons cause the plane yaw the wrong way as with the same movement the down aileron creates more drag than the up one so some rudder is required as well to make the plane turn correctly.
So with differential ailerons you only need a fixed fin and can do away with the rudder servo.
The flaps (using the rudder channel) were an experiment to see how slowly it could be made to fly and it is indeed pretty slow.
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