2 blade to 3 blade on 30+ with M-18

[lschill]

I’m thinking of changing from my two blade prop to a Campbell Sailer three blade, 12” x 7.5”. It’s on my 1983 30+ Universal model 18. Anybody done this?

 

[Frank Langer]

The Campbell props have a very good reputation. On our 1984 E30+ with the larger 5416/M20 engine we have a
13 x 9 inch 2 blade folding prop, and the company said it should be 15 x 9, though we don't have enough clearance for that.
So the prop you're considering sounds a bit small to me, though maybe that's the difference between a 2 blade and a 3 blade. But if you're checking with the experts, they will know best.
Frank

 

[bolbmw]

Our 30+ has a 5416 and we have a three blade Osborne 13x11 prop. It seems to work really well for us, although there is a significant amount of prop walk in reverse.