I have to echo Ken's words. Most trainers of today have a single servo to control both ailerons, and it is centered in the wing.

I did see a Telemaster where the servo wasn't centered. (see picture below) It was in the rib bay just off center. So technically, a person could find examples of airplanes that use 1 servo to control both ailerons, but that servo isn't centered. In that instance, I'd be more concerned that the servo wouldn't move the aelerons symmetrically. The angle of deflection between the servo arm and the torque rod would be different. I'd think the servo would move one aileron faster, and to a different throw than the other. This would effect the roll rate far more than balance issues would.


But in either case, as Ken will expouse (sp?), the builder/assembler needs to balance their aircraft laterally.