Well I needed a spare prop. I have a 5.0 MPI in a Monterey 234FS and was running a stock 14.25 x 19 aluminum - 1.62 ratio. Performance was pretty good - 48-49 MPH at 5000 with gear, 1/2 tank gas and two adults. I wanted a SS so I went to my old faithfull boat prop shop and they said I should run the Solas NS3 14 x 19 prop. I got out on the boat this weekend with the new SS prop an with just me in the boat with all the same other conditions all I can get is 46 MPH at 4700-4800 rpm. It planes well but I lost a few MPH! Is this normal? It also seems I can trim out farther with the SS. Maybe it is the cupping? Not a big deal, but just curious.