If one could could pick an RPM to run a stock 13b at with no regard to prop size, would it be 6600 RPM  ( Full throttle )?  I am designing/modify a belt drive and would like to run the largest prop diameter possible ( I have a large airframe shading), and of course I want to get the most torque.

much aprecaited

Lionel

The RX8 engine red line is 9000 RPM.

Paul Lamar