Well I didn't to fly the plane tell Saturday Like i said i put the HB40 on it and that is what this plane needed it flew beautiful I didn't tell you what plane it was so here it is it's a 1970ALLEYCAT this is a beautiful plane and i just fell in love with it the first time i seen it .At half throttle you can loop it spin it and do just about anything you can think of. That HB40 has about the same power that a OS 60 has.