Topic: Going from a two blade to a three blade prop.
I am tring to find out my prop. shaft size, so I can go from a two blade to a three blade prop. I have a 81 Contessa 26. I would appricate any advice. Thanks Michelle.
Re: Going from a two blade to a three blade prop.
if your engine is a Petter 6.5 hp. The shaft is 7/8 diameter and the 3 blades prop should be a 11X7. If you found a cupped 3 blades, go with a 11X5