Vibration can be the result of the clearance between the tip of the prop and the bottom of the boat. The rule of thumb, as I understand it, is that the clearance should be at least 10-15% of the prop diameter. More is better.
So if you have a 16" diameter prop you should have a minimum of 2" clearance between prop and hull. More is better for vibration dur to pressure wave and for efficient flow. The old 17" prop on my boat caused vibration. The 16' prop doesn't seem to. Of course, that might be caused by different blade shapes, or balance, or whatever. YMMV. Rick Brass From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jim Watts Sent: Tuesday, October 22, 2013 10:57 AM To: 1 CnC List Subject: Re: Stus-List Folding/feathering Props According to rumour, PYI told someone that the 2-blade MaxProp can cause some vibration issues between the tip of the prop blade and the flat on the bottom of the bustle on some C&C's. This is probably what is happening with ours, since it is smooth as silk at some RPM's and will vibrate the fillings out of your teeth at others. The reason I don't think it's the prop itself is that a standard out-of-balance prop will cause worse vibration at higher RPM's, but ours smooths out quite a bit at the top end .
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