I could use some advice with picking props for my pylon planes.
Our club does more of a "fun-fly" race where planes are broken into classes based on engine size.
Since I race in 4 categories, I could use help picking good prop sizes for each engine, in each category.
Is there a basic rule of thumb for picking prop sizes that would work across the board?
I have heard (for example) that with a OS .46 FX, A 9X7 prop is ideal, but I get 15.8K rpm with 8.1 lbs thrust with a 10X7.

Im so confused.

Any help would be appreciated

Thanks
Craig

[email protected]