You can see the "Columbia" there on the left still has elevons in that photo ( also before power system was installed) Now that i think more, perhaps its the dx6i in that you cant have separate expo on pitch versus roll. If there was a way to do that it might work. In my experimenting, im pretty sure for expo to work it has to be set the same on both aileron on elevator. The more it think here the more i wonder if the key isnt to do all your reversing and expo prior to activating the mixing??? Ill have to try that on another model. All in all the single tip aileron works well, plus the new ar6400 makes life even worse for elevons. In elevon mode the trim does all kinds of strange things, by product of mixing the rudder to aileron and all that...still fun to play around with!! Also seen is my shuttle carrier vehicle, its twin edf30 brushless, its like a rocket ship also.