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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

zinc placement

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ddlyle
Captain

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302 Posts

Initially Posted - 08/08/2002 : 12:44:16

I'm a new owner and since my boat stays in salt water, I need a zinc to protect against galvanic action.
I was told that I could hang a zinc over the side (like soap on a rope ... kind of a temporary fix) until next year when I haul her out for new paint, and can attach a zinc to the hull then.
I seldom have my shore power plugged in, but neighbors around me (at the marina) always use their shore power.
So, what guidance can you old salts give me?
Thanks a million.

Cap'n Dave
Sailing The Blues
1986 C25 sr/sk #5413

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 08/08/2002 : 13:09:24

On an '86, your thru-hulls are plastic, your motor is probably tilted out of the water, and the only metal that is exposed to stray current in the water is probably your keel/cable/winch combination. That suggests a zinc on the keel. Everything else is insulated from those problems.

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 08/08/2002 : 13:50:53

I agree with Dave. The only place you should need a zink is on the keel. If your motor does'nt clear the water you might find a zink on the lower unit. If not I would put one there.

Doug&Ruth
Wind Lass
Tacoma Wa.

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frich
Captain

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USA
418 Posts

Response Posted - 08/09/2002 : 07:40:46

On my 84 C25 SK, I have zincs on either side of the keel. They are the round flat type and screw into tapped holes. Also have a zinc on the cavitation plate on my outboard. And lastly I bought one of thos sacrifical fish from west marine which has a battery type cable that attaches to my shrouds. I use this at my boat slip because of all the shore power and chargers in the area I fear for electrolysis in the water.

Better safe than sorry<img src=icon_smile.gif border=0 align=middle>

Frank Rich

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 08/09/2002 : 09:46:32

Frank:

If your rig is grounded, then electrolysis from stray current is an issue. If not, your shroud attachment has no beneficial effect, and could do more harm than good. Even though the "fish" is sacrificial, the connection (copper to stainless?) can cause galvanic corrosion at the shroud. The only metal that's threatened by stray shorepower is the metal that's electrically "connected" to the water.

If I'm wrong, somebody yell at me and I'll go to my corner, but in my semi-educated opinion, you're potentially creating the problem you're trying to avoid.

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT

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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.