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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