ORIGINAL: africanmike
They don't like to run much above 10000 R.P.M. so prop accordingly. An A.P.C. 15x8 will turn about 8900 and a master airscrew 14x9 three blade , about 9600. The MA 14x9 can be difficult to find Though and a 14x7 three blader will churn about 10000 R.P.M.
I have to disagree with you on this. I have an OS 91FX on a pylon plane and it turns an APC 12x8 prop at 13,500 RPM on the ground, and 14,700 in the air. My engine runs perfectly every time, every flight.