sctcrash, I've flown one with a 46 in it. Flew good but I missed the pull of the 4 storke and the extra power of a bigger engine. However, I feel the best maneuver this plane does is the inverted flat spin. And I could do them just fine with the 46 although I couldn't make it rise. However, it will do the inverted flat spin landing as good as with the bigger engine. They are so cool.
Thanks,
Barry