How much zinc is enough? - Page 3 - SailNet Community
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post #21 of 37 Old 10-17-2011
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IF your marina is a HOT marina, depending upon the time you want to have your boat dived and zinc replaced, will depend upon HOW many zincs to put on. With 2 zincs, I go about 4 months, 3 zincs I can get a bit more ie 7 months and one will be dang near gone! ie literally! My max prop does not have a tip zinc from what i can tell, so the extra zinc is liked by a lot of folks in my marina, recommended by the local repair place at the marina to stave off excess damage.

The how much frankly will depend upon the marina etc!
The "hot" marina is largely a myth. If you are depleting anodes too rapidly, it is most likely because of an electrical issue aboard your boat. Also bear in mind that when you are plugged into the shorepower system, you are in electrical contact with every other boat on your particular circuit and can be sharing their problems. Way down on the list of potential causes for rapid zinc depletion is the so-called "hot marina."

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post #22 of 37 Old 10-17-2011
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The "hot" marina is largely a myth. If you are depleting anodes too rapidly, it is most likely because of an electrical issue aboard your boat. Also bear in mind that when you are plugged into the shorepower system, you are in electrical contact with every other boat on your particular circuit and can be sharing their problems. Way down on the list of potential causes for rapid zinc depletion is the so-called "hot marina."
Then there are a hell of a lot of us at my marina with electrical problems frankly. I'm getting the same time out of my zinks as everyone on my dock and elsewhere in the marina. I suppose it is possible the issue is "MY" boat. why do others in the two YC's out of this marina have the same issue. from literally new boats, to ones that are 25+ yrs old like mine? Or are there That many bad boats at this marina? SOmething sure is causing us to eat zincs. 2 per 4-5 months is pretty normal per 3 divers in the area. Other marinas are around are a LOT less! Something in the ground, on the dock or equal is causing an issue.

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post #23 of 37 Old 10-17-2011
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I suppose it's possible to have a marina-wide problem but in my 17 years of earning my living in dozens of different marinas, I have yet to see it happen. I have heard it said of just about every marina I've ever worked in. But I've yet to see it actually be true.
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As I said earlier, the is ONE resident repair person who has been here for years, a number of divers that work out of here, ALL have said zincs go away faster at this marina than others on Puget Sound. If it were my boat, kewl, I can fix that, but way too many others are having issues. The resident was the one last Feb when i had the boat out, he came up to me and said, I should put three zincs on the prop to protect my max prop if nothing else. All three were replace the last week in sept, and they WERE shot!

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post #25 of 37 Old 10-17-2011
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I am dismayed someone would believe that a voltage difference could exist between two dissimilar metals when they are tightly bonded together.
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.

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post #26 of 37 Old 10-17-2011
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I suppose it's possible to have a marina-wide problem but in my 17 years of earning my living in dozens of different marinas, I have yet to see it happen. I have heard it said of just about every marina I've ever worked in. But I've yet to see it actually be true.
Suggest you check out David Rifkins site. Dave is the guy who studied this issue for BoatUS and USCG. He has a different opinion.

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post #27 of 37 Old 10-17-2011
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Suggest you check out David Rifkins site. Dave is the guy who studied this issue for BoatUS and USCG. He has a different opinion.
If he does, I can't find it. Maybe you'd be kind enough to quote him or link to the page of his web site where he discusses the "hot marina".
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If he does, I can't find it. Maybe you'd be kind enough to quote him or link to the page of his web site where he discusses the "hot marina".
Go to Quality Marine Services, LLC

In the left hand column is a button entitled "Electric Shock Drowning".

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post #29 of 37 Old 10-17-2011
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Go to Quality Marine Services, LLC

In the left hand column is a button entitled "Electric Shock Drowning".
Yeah, I read that. What does that have to do with the supposed "hot" marina? In his discussion of electric shock drowning (almost entirely unheard of in saltwater marinas, BTW), he says nothing about corrosion.
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Yeah, I read that. What does that have to do with the supposed "hot" marina? In his discussion of electric shock drowning (almost entirely unheard of in saltwater marinas, BTW), he says nothing about corrosion.
current in the water equals ..... current in the water.

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