se's might be the one exception. it isn't a full 3d plane anyway, more of just a nice flying fun fly type plane. the gear on the plane barely allows for a 12 inch prop, anything larger without different gear is not going to work, and the plane just looks ugly with larger gear on.

as others have mentioned, it also is best to keep the entire plane LIGHT! this isn't one to massivly overpower, since the fun factor in the plane just kind of leaves if you have it heavy. I've had two se's with various powerplants ranging from a 40 os LA to a .72 saito and also a OS 60 size in there. best combination was an irvine .53. (there is a reason everyone raves about this combo!!)