RE: ZDZ 80 Hard to start
I have the engine on a Wildhare Extra260 33%. No idea what it turns or what the plane weighs. I don't obsess about that kind of thing. Has plenty of power. It will launch the plane in about 30 feet if I hold a little up elevator and will pull good vertical for a long way. Loops as big as you want to make them. That is about all I need to know. I tried to hover it but I'm not that practiced and it kept climbing at half throttle or a little less. Should do OK if I try to 3D it. My CAP232 has a 27x10 3W85 on it and will climb forever. Still don't know what it turns either. I'm not trying to be smart about it. I'm just not concerned as long as it performs to my style of flying. As I am not racing, trying to get the last rpm out of a sport flyer is not real high on my "to do" list. Good luck with your engine.