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Gloss
Master Marine Consultant

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USA
1916 Posts
Initially Posted - 03/12/2004 :  15:41:54  Show Profile
Hi
If I have a lead keel, and always raise my motor out of the water when docked, do I need to install zincs on my wing keel? Nobody uses power on my dock as it is just a "summer slip" with only one or two 125 volt receptacles on it which are rarely used.

I don't think I do, but want to make sure.
Frank Gloss
Formerly 89WK/TR
85 Ericson 32-3 shoal draft "Molto Bene"
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 03/12/2004 :  18:29:26  Show Profile
You don't need them on your keel.

Edited to add that if you use your boat in salt water you should attach a zinc to your outboard's cavitation plate.

For fresh water use, another metal other than zinc is used for protection but I'm damned if I can remember for sure what it is, but I think it might be bare aluminum.
Edited by - oldsalt on 03/12/2004 18:37:35
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 03/13/2004 :  12:49:28  Show Profile  Visit Douglas's Homepage
If your through hulls aren't bronze, your outboard isnt left in the water and you have no other metal objects in the water (NO) you dont need a thing. Why would you you have nothing to corrode.
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sailgal
Captain

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USA
400 Posts
Response Posted - 03/13/2004 :  14:28:01  Show Profile
Lets add a twist, how about WB boats in salt water? The line cable attaches to the center board with a small clevis pin. I use to use a zinc fish which I clipped to the metal cable and hung overboard (new own precaution) Now that the cable is line the only metal is that clip at the attachment point to the board under the boat. No way to clip the zinc to it. My thought on this is that electrolysis occurs when dissimilar metals are in contact with each other and stray current attacks. The clevis and pin are stainless, so I wonder.....(where a metal cable touches the clevis ball, clips and so on..well there I'd be more concerned) Food for thought....
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 03/13/2004 :  14:46:23  Show Profile
Suzie, that's why you should have a zinc on your outboard if you use it in salt water since the dissimilar metals within your engine, as well as your lower unit will be in contact with each other and the salt water while you are running under power. Those hours add up.
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Gloss
Master Marine Consultant

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USA
1916 Posts
Response Posted - 03/13/2004 :  14:53:32  Show Profile
I have a zinc on my Honda outboard, and even though it is only a year old with only two trips to salt water you can see some pitting on it already.
When I had a Catalina 22 swing keel a lot of folks in their association used zinc fishes, or somehow bonded them to their cast iron swing keels. I only owned my C22 swing for a little over a year and didn't worry about having a zinc in fresh water
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 03/13/2004 :  19:14:17  Show Profile
Frank, there's actually a small pocket which is built into the lower unit of my Johnson 9.9 which is tapped and threaded to accept a rectangular zinc. The zinc corrodes at a rate that shows it's working and I replace it annually.
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Raskal
Navigator

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USA
162 Posts
Response Posted - 03/15/2004 :  12:44:57  Show Profile
I tossed an old zinc into the bilge of my fin keeler just in case standing water creates some kind of circuit with the keel bolts. I'm not an electrical engineer, but if the idea isn't too useful it at least didn't take much work...

Rich K.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.