1989 24' suncruiser pontoon with 35 hp johnson prop question

[Blujay96]

I have a 3 blade prop that is slipping. Wondering about going with a 4 blade prop. My current prop is 10" with a 13" pitch 3 blade. It is running at 5500 rpm wot. Which is right within where it should be. Wondering what would be the correct pitch in a 4 blade. Also what would I lose in speed. I hit a top speed of 16 mph right now. I don't want to lose much speed

 

[MH Hawker]

Re: 1989 24' suncruiser pontoon with 35 hp johnson prop question

You may want to get a mod to move this over to the prop section, Pontoons dont necessarily follow the normal rules for props, but as a very general rule when switching from a 3 to a 4 blade you go down in size in your case a 3 blade 13 P to a 4 blade 11 P, but ask the prop guys first.