New F-150 Prop question

[Saltfever]

We purchased a Sea Hunt BX22BR bay boat with the F-150. Test ran the boat with an aluminum prop. WOT RPM 5800. Speed 45,,3 adults, fuel tank of fuel and coast guard gear. Ordered a stainless when the boat was ordered. Dealer changed to M18 prop. No idea what the pitch or dia. are. WOT 5100 RPM's and speed 42 MPH. 2 adults, fuel tank of fuel and a few rods and reels. Read the Yamaha performance specs on line and looks like a Reliance stainless is the best choice, 13 3/4 X 19. P/N 68F45974-00-00. So what is an M18 Yamaha prop? What should we use on our new boat for the max performance. Side note, the M18 is noisy at idle speed.

Thanks,

[boats.net]

The Reliance series is a better choice for the F150, I would go with the one on performance bulletin, the M18 is probably a 18 pitch Performance Series

[Saltfever]

The Reliance series is a better choice for the F150, I would go with the one on performance bulletin, the M18 is probably a 18 pitch Performance Series

Thank You for the response