Originally Posted by tinker
Doesn't engine height (relative to transom) have alot to do with max speed, in a straight line, in a flat sea? (going down hill, with the wind behind you)
Yes, and this also is dependant on prop type,some props like to run higher up and then will give that little bit more speed however you are potentialy risking how well the prop will "grip" once the going gets rough.
Its all a bot of a trade of and the whol prop thing is never cur and dried.
43.5 knots for a 150 with 3 up on a solid boat like a Ribcraft sounds about right to me. I get similar speeds on my 6.5 with the same HP and just me on board (so three up basically