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...