Thanks Bill. I presume you are referring to an APC 12 X 10 Pattern prop ? Cannot find an APC 12 X 10 Sports prop.
ORIGINAL: Bax
For general-purpose flying, we use an APC 12 x 10 propeller. Turn the engine in the mid-to-high-9,000's when leaned to just rich of peak RPM and you'll be fine. Any prop that turns that RPM and flies the model the way you want is OK.