Have you tried any other props?? I am not saying I dont belive you but those numbers are pretty amazing.

I would like to pick one up. I have a home made profile plane that is 15lb on the button that a 45cc homey power very well (unlimited vertical). I really want to try that 52cc from what you say it is WAY more powerful than my 45cc engine. I can only get 7200 rpm with a 20X6 prop.