Originally Posted by JohnnyMW
Here's the update - looked at the engine height on the transom which seemed perfect with the cavitation plate bang in line with the keel. So bought a Solas HR3 SST 13.7/8" x 19" prop. Fitted it yesterday and had the WOT revs up to 6100 and managed to get her up to 40.1knts but consistently 39.5! Pleased but think I might try raising the engine a notch just to see what happens.
Thanks for all of the advice!
I would give it a go, I think the shape of the hull also plays a part, with a deep V the cav plate can be higher than the bottom of the hull.
Mine is about 1 1/2 inches above but cannot go any lower without cutting.
I suffer a bit of cavitation when turning tight but can live with it as it runs very well otherwise. I will have a tinker with props when I get hold of a couple.
My setup is 5.1m, 90 ETEC with a 13 1\4 X 17 prop, had 3 adults today and managed flat out 36mph at 4600 revs.
Any views on this setup?
Thanks in advance.