I would fit a 120 or 150 four stroke. The best fit would be a Laser 150, but failing that any of the 120 Four strokes. Best if Laser is too expensive is probably OS, but cheaper makes all work well. If you prefer a Two Stroke, it should fly on an ASP 1.08 or similar. If you want to climb vertical, try a Moki 135. ByPlanes have a lot of drag and need a lot of power to fully perform in an un-real way. Original full size plane does not climb all that well! I would recommend MDS 148, cheap and strong, but until the new carb comes out and possibly a few internal mod's, dont risk the engine stopping which is a problem to those of us using them.