Yamaha props...

[ivar]

Here's one for you prop guru's out there: <br /><br />I just got myself a new boat , a 19ft Yamarin w/ a Yamaha F115.(Recommended top rpms 5-6000)<br />The boat is a closed cabin, weighing 1700lbs. <br />Currently running 58-5900 w/2 persons, at 40mph. <br />The prop is a Yamaha 13x19 alum. propeller, it seems to work ok for being a stock prop , but I'd like a bit more grip and bow lift.(It blows out and loses grip before I get the hull fully trimmed out of the water) The cavitation plate is maybe a 1/4" above the bottom of the boat. <br />I'll also have a Yamaha Pro series 13.25x17 to try out in a few weeks, I'm not familiar with the pro series props , will this prop give me approx. the same rpms as the 19" alum? <br /><br />If I'm looking for a good all-round SS prop, what size and model would be my best bet? Rapture/Ballistic/PowerTec/Turbo etc?

 

[Forktail]

Re: Yamaha props...

It looks like you've got a little bit more slip than you should. Everything else looks fine. <br /><br />Dropping to that 17 pitch Pro series may be the answer. It just might raise your RPM to 6000 and give you a better bite. Otherwise you might want to try a little more cup on that 19. The cup should give you more bow lift and less slip, but it could drop your RPM...which isn't always bad.<br /><br />Finding the optimum prop is just a matter of trial and error on your particular boat.

 

[ivar]

Re: Yamaha props...

Thanks,<br />Forgot to say I have less than 10 hours on the engine , I guess it will loosen up and get more rpms as I get more hours on it?