ORIGINAL: DoubleDD
What would the end result be in engine rpm ? If you ran a 12x6 and changed to a 11x7 would rpm stay the same ?
No, the 11x7 would be less engine load and that would allow the engine to produce more RPM.
on the prop selection for your engine, there is only one way to know what works best with your engine/plane setup and that is real world testing.
kc