I am currently flying a 1/4 scale Dynaflite Fly Baby. I have a Saito 120 mounted and it provides plenty of power for this model. After I am airborne, I reduce the throttle to about 1/2 and the bird flys very scale like. I have seen this plane fly with a 91 and it appeared to be a bit "mushy" to me. Better too much than not enough. You can always throttle back and if you need it, you got it. I did hinge mine at the top of the leading edge and aileron and they work just fine. They are very much like the "barn door" style used on the Cubs. Bottom line is that the bird is a pleasure to fly. Your gonna like it a lot.......