O.S. Max-H .60 Gold Head
A friend - av8rsodt - and I ran his Max-H .60 Goldhead today. This is a loud one as it has an exhaust baffle/wiper and no muffler!
I was very impressed with the 12,458 we got with an APC 11x7 burning Powermaster GMA 5/22. That's 1.24hp and 6.74 lbs. static thrust.
The engine has very little run time and will certainly get a bit stronger as it gets fully broken in.
My ears were really ringing after standing beside an open-exhaust .60 doing 12 1/2K. Your whole body resonates.[sm=spinnyeyes.gif]