How much zinc is enough? - Page 4 - SailNet Community
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post #31 of 37 Old 10-17-2011
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The original point I was trying to make (apparently not well) to the OP was that this is an extremely complex issue and that free advice is worth what you pay for it. Unless one has certification in marine corrosion or NACE training, free advice from shade tree electricians can be costly and on rare occasions deadly.

This is my last word on this subject.

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post #32 of 37 Old 10-17-2011
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current in the water equals ..... current in the water.
Nothing either you or Rifkin has said provides the slightest bit of evidence of the existence of marina-wide corrosion issues. Again, I suppose it may exist, but in my experience, the term "hot marina" is just another one of those things that boaters talk about but don't really know about. And that is a term I hear bandied about all the time. In 17 years of replacing zincs on boats in virtually every Bay Area marina, I have yet to see an honest-to-God "hot marina".

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post #33 of 37 Old 10-17-2011
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...free advice from shade tree electricians can be costly and on rare occasions deadly.
On this we can agree.
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post #34 of 37 Old 10-17-2011
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OK I have a lightish 30 year old 44 foot grp boat with the usual collection of thru hulls a large metal fitting at the base of the skeg hung rudder and a prop shaft with a P bracket.

When I bought the boat it came with a single doughnut zinc on the propshaft. This lasts a year although the one I have just taken off was ready to fall apart.

Is this enough ?

Should I fit 2 propshaft zincs ?

Should I fit a separate zinc to the rudder bearing at the bottom of the skeg.
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post #35 of 37 Old 10-17-2011
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Quote:
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Is this enough ?

Should I fit 2 propshaft zincs ?
Two is a very common arrangement, is cheap insurance and almost certainly not going to over-protect the boat.

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Should I fit a separate zinc to the rudder bearing at the bottom of the skeg.
Unless you have found evidence of corrosion there, probably no reason to add a zinc.
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post #36 of 37 Old 10-17-2011
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Ok Lets jam a piece of carbon against a piece of stainless steel so tightly that even humidity cannot penetrate .... now we spin the stainless at 2800RPM......

I think you could sell that idea to Bic .... don't think Yanmar would be interested.



I am beginning to think you don't know what your talking/writing about!


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http://www.mgduff.co.uk/pdfs/commerc..._Earthing_.pdf

http://www.engineersparadise.com/six...0grounding.pdf

Last edited by foggysail; 10-17-2011 at 01:15 PM.
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post #37 of 37 Old 10-17-2011
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Quote:
Originally Posted by Fstbttms View Post
Two is a very common arrangement, is cheap insurance and almost certainly not going to over-protect the boat.


Unless you have found evidence of corrosion there, probably no reason to add a zinc.
Thank you. Two propshaft zincs it shall be.
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