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Old Sep 10, 2012, 03:01 AM
pompebled is offline
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Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
5,561 Posts
Hi Savage,

Basically a three blade can be smaller to have the same blade surface as a two blade, depending on the propdesign, a threeblade generally draws slightly more current in my experience.

Usually M4 means the prop is meant for an M4 threaded shaft, but twith the Chinese, you never know until the prop arrives at your doorstep and you can see for yourself...

What diameter shaft does your boat have? (the smooth section).

Regards, Jan.
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