Originally posted by Shaun
Hi to all on Ribnet
.... the props are standard and have a 15 degree pitch I want to go for stainless ones but keep reading about different pitch etc.
I think you mean 15 INCH pitch.... That's the theoretical distance your prop would travel through a solid during one revolution.
I had 15" props on my Ribcraft 5.85 with twin 65hp mariners. They were fine and the engines got up to the manufacturers recomended WOT RPM..... just!
Since yours is a bigger and presumably heavier boat.... and since you're talking about s/s props which, I am told, grip the water better, you may find it worth trying out a pair of 13" props just to see how it goes...... but at about £250 each, I'd borrow them first. You should get aluminium ones for around £100 each!
As Richard B said, it really is suck it and see.... what your WOT brings! I certainly wouldn't think any more than 15" though!