The Hog Bipe is by far my favorite flyer. Recently whacked it pretty good. Had the lower wing and fuselage fixed up, and was back flying in two weeks despite the fact that I thought it was a gonner. I am not a stunt flyer at all. More of a cruiser.....I have an OS .61 FX two stroke and while it is a little pokey, it fly's like a Bipe should. Very realistic looking in the air. Never met anyone who didn't love the plane......Advice??? If you want to stunt around, use a .91. If you want to cruise, the .61 is cool.