RE: Aileron differential
Sorry, Paul. Quite the opposite is true. Extending flaps or deflecting an aileron downward increases the wing area and camber, thereby increasing lift and decreasing the stall speed. The direct byproduct of lift is drag (both induced and parasite). In the case of flaps, the drag can be overcome by an increase in power. The drag of the downward deflecting aileron (adverse yaw), however, must be overcome by rudder.
SCW