Right now the boat has a 23 pitch prop on it. i am not sure of the diameter. i just dont think this is the best prop for the boat. it doesnt come out of the water like it should. ran yesterday and at WOT trimmed out the boat is running right at about 4100-4200rpm at 40-42 considering the water conditions. yesterday was a little rough. when i ran that it was with just me in the boat. but with a friend in it it seems about the same. ive pulled 2 tubes with this boat with 2-3 people in the boat which i thought was doing pretty good but after reading on here how i am not in my target rpm i believe i can get better. what i have read on here seems a few people with the same boat and setup are running 19 pitch props. my worries dropping from a 23 to a 19 will put me out of my rpm range. but i was thinking of going to a 19 4 blade to keep in range. i want my whole shot to be about as good as it can be with as close to 40mph we can get. any help would be greatly appreciated. Thanks.