For anyone interested: I went through a few engines on this one but ended up with a sidewinder ASP .91 four stroke turning an APC 15x4. A really nice combination. I still have it but haven't flown it for a while. A good solid airplane but not in the same class as, say, Funtana, Fliton Extra or H9 Extra 260 and others I guess, but tough as an old boot and great fun.