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Old 05-23-2012
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Re: Fixed vs folding prop

Originally Posted by ltgoshen View Post
My 1981 C&C 30 MK1 manual says 6.7 kt at 3400 rpms.
Well here is the thing the last owner put a folding prop on because he raced. I here a thud when I engage the prop. It don’t back up very good. And I can only get around 2,000 rpms? If I push past that very long it starts wanting to smoke black smoke? Like ,I may be pushing too hard on the engine. any advice?

It looks like you have a Martec prop, which is the worst of the folders. I had one of those on my boat, until I found a good deal on a used Gori prop, which is the same idea except there are gears so the blades open and close together. It is definitely smoother, and reverse is much improved; still not great, but better than the Martec. It definitely sounds like the prop isn't sized correctly for your engine.

Last edited by Faster; 05-23-2012 at 11:01 AM. Reason: fixed quote
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