[MAXUM]

This is in a 2003 drive train with 1.88 gear ratio in an Alpha I gen two stern drive.

I had a 19 pitch 3 blade was OK great hole shot, but ran about 25-28 MPH @3000 RPM. Top speed ~48 MPH @5500 RPM. Moved to a 21 pitch 3 blade, a bit of a dog out of the hole, 30-32 MPH @ 3000 RPM. Top speed 52 MPH @5500 RPM.

Moving to the 4 blade gave me the hole shot back I had with the 19 pitch... so quite pleased with the results. I should have added I have a 21 pitch 4 blade spitfire prop now. The thing that I was looking at mostly was that mid range MPH to RPM. I never run WOT but occasionally will if the lake is dead flat just because. Mileage on performance varies weight and hull geometry does play a part in how well any particular prop will perform.