Depends on what you are trying to do. 4 blade props of the correct diameter and pitch, coupled with raising or lowering a motor can make all the difference in the world. Not trying to go against you Jim B, but I believe it all depends on the setup, prop size and pitch, and what you want it to do. Adding a 4 blade Renegade 23 pitch prop to my boat helped holeshot a lot. Adding a SE Sport 300 hydrofoil made it literally "jump" out of the water, and stay on plane better at slower speeds. However, a balanced and blueprinted 3 blade Raker 24 pitch prop coupled with a 6 inch jackplate set at the correct height made my head snap back at takeoff, and made my 18 footer scream at top end. It's all in what you are trying to do. Remember - you don't have to stick with factory props now-adays. Prop shops can re-hub competitors props to fit your engine. The posibilities are endless. I learned a lot about props from Bass and Walleye Boats magazine - one of the only boating magazines I subscribe to - very informative.