Pitch/Dia/Ears/RPM Factors
 

Please refresh or correct my memory on the general rule of thumb factors concerning changes in pitch, diameter and blades on RPM.

1" pitch = 200rpm
1/4" diameter = 100rpm
1 blade = 400rpm (was it 1 size or 1 inch)

Also, I believe I prop for rpm at max hp but cruise at max torque rpm.

Sorry if so trite but couldn't find much with search and didn't see an FAQ sticky

WaterPistol,

Generally we use 150-200 per inch of pitch change
1/4" diameter is 150-200 rpm
1 blade is one inch of pitch

There are MANY variables to take into account and this is a very general guideline.

Matt