My understanding is that I will have to use the same type of mixing as the fly boys us on a V tail plane. How this is done Electronically I am not sure. I have picked up a 6 channel radio that is intended for robotics that is supposed to do mixing. the problem with it is that it is intended to be used with a microprocessor unit (which I don't have), so I have to do a hack on the receiver part (adding a decoder section) so I can use regular servos with it.
Regards,
Gerald.