Ed, thanks for your technical but understandable explaination. And to you you also Lee for the addition. I'm not sure if I'm ready to take on this option yet. The reason that I was intrigued was an idea I had about hinging both flaps and ailerons on concentric aluminum tubes thereby eliminating external mechanisms (horns, rods, etc) By using the same control surface for two funtions, it would make it simpler, one less layer. I'll have to check my radio out for the features that you mention.