Originally Posted by Nos4r2
It will, but it'll reduce your top speed.
A 19p 5 blade will do less rpm than a 19p 3 blade. You're better off doing the comparison on like for like props and only changing one variable at a time.
Thanks for all the advise but I have given up
, I took the boat out for a test today with the outboard raised so the cav plate is 1" above the bottom of the boat and a smaller prop ( 15p ) but the revs are still only reaching 4400 when they should be getting 5600.
I have now just taken the boat to Advance Marine to see if the rev counter is telling lies or if anything else is wrong