[C320-list] Zinc a zinc a dink, a zinc a doo

Sat Dec 16 06:05:26 PST 2006

Jimmy,
Nice title!
To have galvonic corrosion you need to have a complet circuit which would allow the current (electrons) to flow.  The salt water is reasonably conductive and could cary current to or away from the strut but then you would need to have another path to allow the excess electrons to leave or provide new ones.  If the metal is isolated then there is no return path. Fiberglass is an excellent insilator chosing to keep all of it's electrons for it's self.  High quality ladders that are used any where near electric wires are made of fiberglass.

So strut no zinc on your dink

Bruce
Sent via BlackBerry from Cingular Wireless  

-----Original Message-----
From: "Adam Weiner" <esquirecatering at rcn.com>
Date: Fri, 15 Dec 2006 21:46:52 
To:"'C320-List'" <c320-list at catalina320.org>
Subject: Re: [C320-list] Zinc a zinc a dink, a zinc a doo

Wouldn't the strut be subject to problems from stray electrical current
in the water even if it was not in contact with any other metal or
electrical part on the boat?

Jimmy Durante

-----Original Message-----
From: c320-list-bounces at catalina320.org
[mailto:c320-list-bounces at catalina320.org] On Behalf Of Kirk McCullough
Sent: Friday, December 15, 2006 7:47 PM
To: bruceheyman at cox.net; C320-List
Subject: Re: [C320-list] Was leaving list, now zinc question for Orlando

The zinc will corrode even without providing any anodic protection. If
there 
is no current path from the strut to any other part of the boat, the
zinc 
will provide no protection against corrosion on any or all parts of the 
boat, but it will corrode all on its own in sea water.

Kirk McCullough

Boomerang #124

----- Original Message ----- 
From: <bruceheyman at cox.net>
To: "C320-List" <c320-list at catalina320.org>
Sent: Friday, December 15, 2006 2:27 PM
Subject: Re: [C320-list] Was leaving list, now zinc question for Orlando

> Orlando,
> Cool, did you ever see one of the zinc's that came off the strut?  If 
> was
> eroded then there must be an electrical connection some where.
> Bruce
> Sent via BlackBerry from Cingular Wireless
>
> -----Original Message-----
> From: Orlando.Duran at AveryDennison.com
> Date: Fri, 15 Dec 2006 13:46:01
> To:"Catalina 320 List" <C320-List at catalina320.org>
> Subject: Re: [C320-list] Was leaving list, now zinc question for 
> Orlando
>
> Hull #112 was delivered to me by the deale (H&S Yachts in Newport 
> Beach,
> CA) with the strut pre-drilled and a zinc attached so I just continued
to 
> do it....
> ----------------------------------
> Regards,
> OD
>
> Sent from my BlackBerry Wireless Handheld
>
>
> ----- Original Message -----
> From: "Bruce Heyman" [BruceHeyman at cox.net]
> Sent: 12/15/2006 01:05 PM
> To: "'C320-List'" <c320-list at catalina320.org>
> Subject: Re: [C320-list] Was leaving list, now zinc question for 
> Orlando
>
> Wes etal,
> I do not have a zinc on my strut and did not see a place to affix one.

> I suppose it would not be hard to drill and tap a couple of holes, tap

> them and install a zinc. That said I'm not sure why you need one.  
> Some builders bond everything metal that is in the water (through 
> hulls, strut, shaft,
> keel...) to a central location including the engine and rigging.  My 
> last boat was that way.  We didn't have a zinc on the strut then 
> either as the conventional wisdom was that it was electrically boded 
> to the shaft and the zinc's (we always kept two) on the shaft were 
> close enough to keep it protected.
> I just checked on our 320 (hull #671) it would appear that the strut
is
> electrically isolated and hence does not need a zinc.  Is there a 
> connection
> that I'm not seeing?
> Thanks,
> Bruce
> Somerset 671 SoCal
>
> -----Original Message-----
> From: c320-list-bounces at catalina320.org 
> [mailto:c320-list-bounces at catalina320.org] On Behalf Of 
> Wes.Giles at averydennison.com
> Sent: Thursday, December 14, 2006 11:26 AM
> To: C320-List
> Subject: Re: [C320-list] Was leaving list, now zinc question for 
> Orlando
>
> Jon,
>
> I always had two on my 320 in So Cal (marina del rey). The strut and 
> the shaft. I know have one on the prop and one in the water on my 387.
>
> Wes
>
>
>
> jonvez at comcast.net
> Sent by: c320-list-bounces at catalina320.org
> 12/14/2006 10:02 AM
> Please respond to
> C320-List <c320-list at catalina320.org>
>
>
> To
> C320-List <c320-list at catalina320.org>
> cc
>
> Subject
> [C320-list] Was leaving list, now zinc question for Orlando
>
>
>
>
>
>
> Orlando,
>
> You say you used a zinc on the strut of CL2? Just curious as to why 
> since it would be an isolated piece of metal? You have me concerned 
> now since I have never protected the struts on either my 30 or 320....
>
> As for the other questions, our marina has no problem with divers and 
> I have the diver check and clean the bottom in the middle of the 
> summer. Never have had an issue with my shaft zinc--it's the prop zinc

> that I need to watch.
>
> I used 2 zincs for years, but my diver convinced me to try just one 
> this season and after about 7 months in the water, it proved to be 
> just right--just about half gone. I use Godfrey zincs which seem to 
> work much better than the Canada zincs you find in West.....
>
> Regards,
>
> Jon Vez
>
> -------------- Original message --------------
> From: Orlando.Duran at AveryDennison.com
>
>> John,
>>
>> My dive service routinely replaces zincs as they are wearing 
>> out...here
> in So
>> Cal that would be every 4-5 months...on the 320 they would replace 
>> the
> shaft and
>> strut zincs and on the 440, I purchased 6 zincs from Flex-O-Fold that

>> go
> on the
>> end of the prop that I will give to the diver so that it will be
> installed as
>> needed...
>>
>> Any reputable dive service should include zincs as part of their 
>> overall
>
>> maintenance service for you...
>>
>> Have a great time on the 36! Is delivery eminent?
>> ----------------------------------
>> Regards,
>> OD
>>
>> Sent from my BlackBerry Wireless Handheld
>>
>>
>> ----- Original Message -----
>> From: John Van Vessem [jvanvessem at sbcglobal.net]
>> Sent: 12/10/2006 07:58 AM
>> To: C320-List
>> Subject: [C320-list] Leaving the 320 list
>>
>> To all my friends on the 320 list I just want to say what an 
>> educational
>
>> pleasure it has been to read these conversations, I am moving to a 36
> and hope
>> to join their list if they have one. I'm going to miss my 320 it has
> been an
>> incredible boat and the whole reason I'm sticking with Catalina.
>>
>> Before I leave I need to tell you about a recent experience. My 320 
>> was surveyed for the new owner and when we hauled it out of the water

>> we
> found that
>> the bronze shaft had corroded down by about 1/8 inch in diameter, the
> zinc was
>> missing and was only 10 months old. Bottom line I had to spring for a
> new
>> shaft, stainless this time. Replacing the zincs has not been in my
> standard
>> maintenance routine. But after talking to the 320 dealer he suggested
> that the
>> zincs be replaced every couple of months. I'd like to hear what other
> people
>> have experienced who keep their boat in the water all year.
>>
>> John Van Vessem
>> Sojourn 645
>> Vallejo Yacht Club
>>
>>
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