The performance of the two planes is quite a bit different. What kind of flying do you want to do? The Supersporter is more of a sport plane. It will do some aerobatic stuff but the Chipmunk leans more toward an Extra or Cap. I cant help you on the fit of the motor but maybe the flying style can narrow down your decision. I personally would not worry about the reccomended motor size. This is only a starting point. For example Goldberg says a 60 two stroke is right for their ULT. Sure it will fly it but not very well. I run a 90 in mine and it could use more power.


David