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Fish Zincs

zinc anode prop shaft

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#1 Ajax

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Posted 01 July 2013 - 02:11 PM

I am dimly aware that you can buy fish-shaped zincs from Defender,  that you basically clip to your standing rigging and leave hanging over the side.

 

http://www.defender....84706&id=150598

 

Do these preserve your prop shaft zinc? Or do they get eaten away at the same rate? Are these mainly to help preserve aluminum hulled boats?

 



#2 Mr. Fixit's brother,, Mr. Fixit

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Posted 01 July 2013 - 02:22 PM

If your engine/shafting is bonded to the rigging then yes to your 1st question.  Question 2 depends on the comparative alloy makeup of the two anodes.  #3, it's an anode,, will just do it's job.  Hang a couple on the pilings either side of your boat and clip em on as you walk away.  Good insurance and protection from stray currents at your dock.



#3 jerryj2me

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Posted 01 July 2013 - 04:41 PM

They will slow the demise of the prop shaft zincs but not stop it.



#4 Ajax

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Posted 01 July 2013 - 05:08 PM

Ah...my rigging and metal thru-hulls are bonded to the engine, so one of these may be a benefit for me.

I don't have a problem with zincs burning up early, I was just curious if there was any benefit.



#5 jerryj2me

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Posted 01 July 2013 - 09:41 PM

Ah...my rigging and metal thru-hulls are bonded to the engine, so one of these may be a benefit for me.

I don't have a problem with zincs burning up early, I was just curious if there was any benefit.

Back 2 boats I ended up in a hot zone of a marina, and was burning thru zincs every 1-2 months. Added the fish zincs and that went to 3 months +

Getting pout of that marina solved the problem.
 



#6 Jim Conlin

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Posted 02 July 2013 - 12:40 AM

I've heard that there is such a thing as too much zinc, particularly with wooden boats.

http://forum.woodenb...05-Over-Zincing



#7 Foreverslow

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Posted 03 July 2013 - 11:38 AM

I own a floating battery as everything of metal is bonded together mast, engine, rigging, lifelines, strut,  seacocks, electronics etc (only thing it is missing is alligator clips for the beer cans in the cooler).

It eats 4 zincs in a 6 month season.

 

With a fish, I can more than double that.

I get 3 years out of the fish itself.

 

every time I pull it prior to a sail, I flip it into the air and let it hit the water hard whch flakes off bits that expose more zinc.

Saves having to wire brush it and keeps the slime and grass from growing on it.



#8 Ajax

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Posted 03 July 2013 - 12:03 PM

4 zincs in 6 months? Holy shit. Glad to hear that the fish helps you.



#9 FastBottoms

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Posted 03 July 2013 - 02:00 PM

Hang a couple on the pilings either side of your boat and clip em on as you walk away.  Good insurance and protection from stray currents at your dock.

 

Bwhahahahaha!



#10 FastBottoms

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Posted 03 July 2013 - 02:05 PM

I am dimly aware that you can buy fish-shaped zincs from Defender,  that you basically clip to your standing rigging and leave hanging over the side.

 

http://www.defender....84706&id=150598

 

Do these preserve your prop shaft zinc? Or do they get eaten away at the same rate? Are these mainly to help preserve aluminum hulled boats?

 

In order for any anode to protect an underwater metal part on your boat, the anode must be in direct electrical contact with the part in question. Further, the the longer the electrical path between anode and metal part, the less protection is provided. 

 

It absolutely is possible to over-zinc a boat, so if you are not currently experiencing rapid zinc depletion, my advice is; if it ain't broke, don't fix it.



#11 Parma

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Posted 12 July 2013 - 12:20 AM

True story; my marina neighbor is hanging on of those on piece of string tied to a covered ( not bare) lifeline.

 

DUH!



#12 Jim Conlin

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Posted 12 July 2013 - 01:42 AM

He'll be pleased with how long they last.



#13 FastBottoms

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Posted 12 July 2013 - 05:06 AM

He'll be pleased with how long they last.

 

 

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