i have a good set of 38%, what do you have? i just put a set of 22% in my sanger shovelnose with about 400hp 454 and am slap the 6000 rev limiter at about 90 im new and dont no any thing about props maybe thats what direction, i have a three blade maybe i should be using a two?? how did you figure out what you needed? what boat do you have and what motor