I just bought a foam F15 from nitroplanes and want to have the elevators split like elevons to make the roll rate even faster. I have a DX7 and a AR 6100 or AR500 available for this plane. Each elevator half has it own servo. So without using a Y harness I must first mix the elevators, but how do I do that? After getting both channels to act as one, can I then mix the elevators with the ailerons? If so, how can I do it? Will the ailerons need to be on a Y harness? I would greatly appreciate any help or advice. Thanks John