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Old 08-07-2012
L124C's Avatar
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Zink placement

A friend had a little mishap on his Cal 30. It seems the rudder will rotate 180 degrees with the tiller up, allowing the rudder to contact the prop. Not a good idea when the prop is turning! The meeting broke the strut, chipped the prop, and of course...gouged the rudder.
In any event, the strut and prop turned out to be very pink (don't know age). Picture of the carnage attached. Two shaft zincs are forward of the Strut. The strut is isolated from the Zincs by a Cutlass bearing. Do the zinks protect it at all?
Would he be be better off using a non folding prop with a zink mounted on it?
Could two shaft zincs be too many? Too much zinc?

On my boat, I have a shaft Zink (prop is midships) and a zink mounted on the fiberglass skeg rudder. I replace the shaft Zink every 1.5 years, but have never needed to replace the skeg zink. How much do non-bonded Zinks do?
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Zink placement-dscn0114%5B1%5D.jpg  

Last edited by L124C; 08-07-2012 at 05:19 PM.
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Old 08-07-2012
L124C's Avatar
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Re: Zink placement

Just showed a diver (mentioned in the other thread I provided a link to) the picture. He said he wouldn't add any more zink, but that the two shaft zincs were about right. He said the strut is isolated and is therefore on it's own (galvanically). Depending on how it is mounted, bonding may be provided internally. If not, something should be done externally. He mentioned that folding props require regular maintenance to keep the blades functioning and bonded.
The owner of the Cal wanted to coat the shaft with something to reduce crustations. The diver recommended something called Prop Speed. He said it is painted on the shaft and the prop, is expensive and fairly effective. propspeed.com
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