For what it's worth. The down travelling aileron effectively increases the camber on that wing half. The resulting increase in camber increases the lift on that wing panel. Due to the interaction of lift and induced drag, the wing with the down aileron will incur more drag than will the opposite wing. The higher drag will tend to yaw the nose in the direction of the down aileron. This requires correction rudder in order to produce truly axial rolls.

This induced drag simply is a function of the increased lift and will apply to all configurations. There might be some additional drag factors depending on hinge location, as top mounted hinges will have less area on the down aileron due to part of the aileron being blanked by the trailing edge, but the aerodynamic forces due to lift still apply.

RCS