bought this 4bladed propto replace an old aluminum 3 bladed prop,pulling mostly skiers,kids on watertoys, this thing pulls like a tractor,way more torque,on our 20ft bowrider it launches the boat on planeinstantly,with the 3 blade prop it took 5-8 boatlengths to get on plane with full throttle, with a 200 lb skier it just pulls them out of water effortlessly, you sacrifice topend speed with this prop,but for our use it is perfect,thanks michiganwheel