ORIGINAL: flyinwalenda
The upward movement of one is greater than the downward movement of the opposite one. This can be achieved with a computer radio provided the servos are wired separately with no ''Y'' connector. Or mechanically by moving the servo arms 1 or 2 clicks forward toward the leading edge (with the servos at center) and then you will have to readjust the clevis for the control surfaces so they are flush.
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Thanks for the information , what about adding a little upward reflex also or just for get that and ad the differential ?