My buddy has been flying one of the Hangar 9 Fokker D7's for the last week. Yesterday I noticed that the outside wing was dragging behind in turns and suggested some aileron differential. He said "Yeah, the instruction manual suggested that" and programmed his radio to the suggested values....more DOWN travel than up. That fixed the problem, it flew just as if he were coodinating rudder in the turns.

Now, that's the exact opposite of what I would have suggested. My understanding is that the rising wing makes more drag so you set up the aileron movement to give more up travel than down to take away some of the drag from the top wing. Am I missing something here?

For those not familiar, the D7 is a slow, draggy bipe with smallish ailerons at the tips of the top wing only. It floats along nicely but the Saito .80-something will just pull it through a loop and gives very limited vertical at this stage of its breakin.