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 Catalina 25 Specific Forum
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quilombo
Captain

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USA
301 Posts
Initially Posted - 05/01/2008 :  19:59:41  Show Profile
I read a posting just before where the member mentioned they changed the zincs on his swing keel cat 25 81 mine is a 78, I dont see any, are there zincs on my boat?? im launching sunday and just want to make sure,
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stampeder
Master Marine Consultant

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1608 Posts
Response Posted - 05/01/2008 :  20:27:42  Show Profile
Zincs were not factory installed on your boat. If you have them they would most likely be on your keel. Ideal location for a SK would be on the trailing edge by the cable attachment or near the leading edge by the hinge. You should also have one on your OB - your manufacturer will have an attachment point, likely on the cavitation plate.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 05/01/2008 :  20:38:20  Show Profile
The factory recommended location is as close to the pivot assembly as possible. Tear drops are what I use, each side of the keel near the pivot and one near the cable attachment. A day sail would be OK, but don't leave it in saltwater without zincs. Drilling and tapping the keel for the zincs is pretty easy.
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quilombo
Captain

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USA
301 Posts
Response Posted - 05/01/2008 :  20:50:48  Show Profile
thanks,,
drill through, or just enough to anchor??
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 05/01/2008 :  21:35:33  Show Profile
If you drill through, you don't have to tap... but that seems like a lot of drilling in cast iron.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 05/01/2008 :  21:57:54  Show Profile  Visit delliottg's Homepage
OK, time for a stupid question from the C-250 side, I haven't seen any zincs on my boat, but I'm also reasonably sure that we have lead keels, not cast iron like the C-25's. I should probably post this in the C-250 forum, but if they're like me they read all the forums anyway. I know I have them on both of my outboards (main & dinghy), but as far as I know, not on the boat.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 05/02/2008 :  09:39:56  Show Profile
...because your boat has no exposed metal below the waterline. (?) The lead is inside a fiberglass shell, and is virtually non-corrodible anyway. A zinc anode protects another metal that it is in contact with by being the most easily corroded metal of the two. But there has to be "electrical" contact with the other metal. (...and the zinc should not be painted.)
Edited by - Dave Bristle on 05/02/2008 09:42:47
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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.