what prop size do i need?

[dmcc]

hello everyone,
can any one tell me what prop size i should have?
my brother has a 26ft searay 1.5 ton, 19ft on water line powered by a 315hp yanmar with a direct drive zf marine box
it has a fixed surface drive "lancing marine" he has tried 19x23 hamble prop but cant get on the plane. :confused:

[Steve H]

Does engine rev up?

[dmcc]

no , wont rev out just a lot of black smoke.

[Steve H]

definetly overpropped. Your current prop is way too big. Should be something closer to 15X18.

[dmcc]

thanks steve, what manufactor would you recommend?

[weehenry]

try this .... www.vmmotori.it