Originally Posted by marksp

I'm running the Saito FG-33R3 (with Ray English mods) on 15:1 synthetic and turning 9450 RPM in flight with carbon fiber 18x6. Max recorded temp is 199 degrees on 75 degree day [on board telemetry]. Per the manual, the max RPM is 9500 on 18x8.

Question - should I up prop to increase load to stay comfortably under max RPM? If so, 18x8, 19x6? or, I'm fine spinning 99.9% of max.

Cheers