I have a 2009 Launch 21V with the 340HP motor. I am running 900 lbs each locker and 800 in center. Fully loaded the boat would not come on plane very well or hold it with the original prop. Last summer I replaced it with the following OJ #945; 15X13 LC 1 1/8" 4 blade wakepro V3. the boat comes out of the water fast, fully loaded it will plane and hold plane. I lost about 3 MPH on the top end maybe a little more. The guy at OJ was great to deal with, very knowledgeable and helpful. To be fair I also have Surftabs on the boat. With those deployed it jumps on plane. Without deployed it still planes just takes a little longer. I usually don't run fully loaded for very long. Seems to have also improved fuel economy when surfing. We don't wakeboard much. Hope it helps.