another prop question,Maco...,RAP...

[phester]

I understand about pitch and its cause and effect,but what about the diameter? The15-1/2 dia. I have now is the largest dia. I could get on that motor,the blades are about 1/2 maybe 3/4 of an inch away from the cavatation plate, so I am not really looking for more diameter. What cause and effect does a smaller dia. have?....MJ,spare yourself and let it go....you'll be a better person.....trust me