This prop is exactly what I needed to get "Fat Betty" out of the water in less than 500 yds. I have a 1988 Bayliner Trophy 22' with a 5.7 Kodiak that was having trouble getting on plane with the same pitch 3 blade prop. With the 4 blade it has brought new life to the old gal. I can get on plane with 4 200+ pound guys and all their snacks with no problem. The rpm range is 3900-4200 depending how much fuel I want to burn when getting on plane and runs out at about 3300 rpms.