[zup]

I have the same set up and have tested two props to date. A 19 inch SS yamaha Salt Water Series will turn 4900-5000 WOT at 46-47 MPH per GPS. A 17 inch SS yamaha Salt Water Series turns 5300 WOT at 44-45 MPH. I prefer the 19 myself as the cruise speed is about 5 MPH faster than the 17 at the same RPM, due to difference in pitch, also the 19 max GPH is around 2.8-3 MPG at 28 MPH, the 17 is 2.4-2.6 MPG at 26 MPH.

I am going to try an 16" and 18" powertech 4 blade in the next few weeks, I will let you know how it works out. But if I had to choose right now I wuld take the 19". It falls right in the middle of the operating range (4500-5500) at right at max HP (5000 RPM). Also, it provides the highest cruise speed and best MPG.

Hope this helps.