Me and my flying buddy had one each. Mine had a 46 in it, and it flew great. That was until I midaired it with a slow flying sailplane..

Flew realy good, and I might buy another someday.
My friend installed a rossi 60 in his [8D] First flight it went into flutter. Bu he managed to reduce airspeed, and he landed safely. He went home and installed blue sulivan cables in it instead of the stock hardware. Next flight it fluttered again, and went in
I guess overpowering this model is a no no...... maybe a 40 on this plane would be safest.