Stus-List Zinc decay

[David Knecht via CnC-List]

When my boat was pulled from the water this year I was surprised to find that 
the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
nearly gone.  I have had this configuration in past years and every other year 
at the end of the season I could barely justify replacing them because there 
was so little metal decay.  I know of nothing I did differently this year.  I 
am on a mooring so rarely plugged into shore power.  What would cause a 
dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Patrick Davin via CnC-List]

Since I just finished reading Nigel Calder's chapter on corrosion, I'll
take a crack at this.

Just speculating here, but do you have any other anodic metals that could
have been acting as anodes instead of your zincs before?  Ex, if you had
the prop painted with zinc chromate, I believe that could act as the anodic
zinc first. If that is used up now, it could explain why galvanic corrosion
moved on to your prop nut + shaft zincs.

Next thing I would worry about is stray current corrosion. I think of stray
current corrosion as like galvanic corrosion on steroids. A weak DC current
in the water can waste zincs hundreds of times faster than galvanic
corrosion. Stray current corrosion on a mooring would have to be coming
from your boat. It can be caused by things like a partial short in your
bilge water (ex, bad bilge pump). You can test for it with a silver/silver
chloride half cell (costs about $120) using the procedure in Nigel's book.

-Patrick
1984 C&C LF38
Seattle, WA

On Thu, Dec 24, 2015 at 9:00 AM,  wrote:

> -- Forwarded message --
> From: David Knecht 
> To: CnC CnC discussion list 
> Cc:
> Date: Thu, 24 Dec 2015 11:47:25 -0500
> Subject: Stus-List Zinc decay
> When my boat was pulled from the water this year I was surprised to find
> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
> other was nearly gone.  I have had this configuration in past years and
> every other year at the end of the season I could barely justify replacing
> them because there was so little metal decay.  I know of nothing I did
> differently this year.  I am on a mooring so rarely plugged into shore
> power.  What would cause a dramatic increase in zinc decay?  Thanks and
> Happy Holidays to all!  Dave
>
> Aries
> 1990 C&C 34+
> New London, CT
>
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Re: Stus-List Zinc decay

[Russ & Melody via CnC-List]

Hi David,

Normally zinc decay over the course of a year is attributed to 
galvanic corrosion, whereas stray current corrosion can happen 
rapidly and be very destructive. A change in Galvanic decay is 
usually associated with a change in underwater metals (new prop 
maybe) or area salinity.


Having said that... I suggest a review of these two primers and then 
inspect your bilge pump wiring very thoroughly looking for the 
slightest of corrosion and replace anything in the damp area that is 
suspect and NO JOINTS BELOW THE SOLE, please.


http://www.pcmarinesurveys.com/AC%20DC%20electrolysis.htm

https://www.youtube.com/watch?v=b3VBBml2J0I

Cheers and Merry Christmas to all, Russ
Sweet 35 mk-1



At 08:47 AM 24/12/2015, you wrote:
When my boat was pulled from the water this year I was surprised to 
find that the Max-prop zinc was gone, one of the shaft zincs was 
gone and the other was nearly gone.  I have had this configuration 
in past years and every other year at the end of the season I could 
barely justify replacing them because there was so little metal 
decay.  I know of nothing I did differently this year.  I am on a 
mooring so rarely plugged into shore power.  What would cause a 
dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave


Aries
1990 C&C 34+
New London, CT

[]




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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

I forgot to mention one thing that might be related to the zinc problem.  
Mid-season, I hit a rock while racing. When the boat was pulled, the lead was 
exposed in an area of about 10 square inches.  Could that cause zinc corrosion? 
 I can see that could create current to the keel bolts, but how would it get 
from there to the zincs?  Dave

On Dec 24, 2015, at 12:21 PM, Russ & Melody via CnC-List 
 wrote:

> 
> Hi David,
> 
> Normally zinc decay over the course of a year is attributed to galvanic 
> corrosion, whereas stray current corrosion can happen rapidly and be very 
> destructive. A change in Galvanic decay is usually associated with a change 
> in underwater metals (new prop maybe) or area salinity.
> 
> Having said that... I suggest a review of these two primers and then inspect 
> your bilge pump wiring very thoroughly looking for the slightest of corrosion 
> and replace anything in the damp area that is suspect and NO JOINTS BELOW THE 
> SOLE, please.
> 
> http://www.pcmarinesurveys.com/AC%20DC%20electrolysis.htm
> 
> https://www.youtube.com/watch?v=b3VBBml2J0I
> 
> Cheers and Merry Christmas to all, Russ
> Sweet 35 mk-1
> 
> 
> 
> At 08:47 AM 24/12/2015, you wrote:
>> When my boat was pulled from the water this year I was surprised to find 
>> that the Max-prop zinc was gone, one of the shaft zincs was gone and the 
>> other was nearly gone.  I have had this configuration in past years and 
>> every other year at the end of the season I could barely justify replacing 
>> them because there was so little metal decay.  I know of nothing I did 
>> differently this year.  I am on a mooring so rarely plugged into shore 
>> power.  What would cause a dramatic increase in zinc decay?  Thanks and 
>> Happy Holidays to all!  Dave
>> 
>> Aries
>> 1990 C&C 34+
>> New London, CT
>> 
>>   
>> 
>> 
>> 
>> ___
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Dr. David Knecht
Professor of Molecular and Cell Biology
Core Microscopy Facility Director
University of Connecticut   
91 N. Eagleville Rd.
Storrs, CT 06269
860-486-2200

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Re: Stus-List Zinc decay

[Russ & Melody via CnC-List]

Hi David,

Lead is more noble than zinc (and slightly less noble than your prop 
& shaft). So, yes. A change in noble metal (increased lead surface 
exposure) by that amount can contribute to an increased loss of zinc.


We hope it's that simple.

Cheers, Russ
Sweet 35 mk-1

At 09:39 AM 24/12/2015, you wrote:
I forgot to mention one thing that might be related to the zinc 
problem.  Mid-season, I hit a rock while racing. When the boat was 
pulled, the lead was exposed in an area of about 10 square 
inches.  Could that cause zinc corrosion?  I can see that could 
create current to the keel bolts, but how would it get from there to 
the zincs?  Dave


On Dec 24, 2015, at 12:21 PM, Russ & Melody via CnC-List 
<cnc-list@cnc-list.com> wrote:




Hi David,

Normally zinc decay over the course of a year is attributed to 
galvanic corrosion, whereas stray current corrosion can happen 
rapidly and be very destructive. A change in Galvanic decay is 
usually associated with a change in underwater metals (new prop 
maybe) or area salinity.


Having said that... I suggest a review of these two primers and 
then inspect your bilge pump wiring very thoroughly looking for the 
slightest of corrosion and replace anything in the damp area that 
is suspect and NO JOINTS BELOW THE SOLE, please.


http://www.pcmarinesurveys.com/AC%20DC%20electrolysis.htm

https://www.youtube.com/watch?v=b3VBBml2J0I

Cheers and Merry Christmas to all, Russ
Sweet 35 mk-1



At 08:47 AM 24/12/2015, you wrote:
When my boat was pulled from the water this year I was surprised 
to find that the Max-prop zinc was gone, one of the shaft zincs 
was gone and the other was nearly gone.  I have had this 
configuration in past years and every other year at the end of the 
season I could barely justify replacing them because there was so 
little metal decay.  I know of nothing I did differently this 
year.  I am on a mooring so rarely plugged into shore power.  What 
would cause a dramatic increase in zinc decay?  Thanks and Happy 
Holidays to all!  Dave


Aries
1990 C&C 34+
New London, CT





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Dr. David Knecht
Professor of Molecular and Cell Biology
Core Microscopy Facility Director
University of Connecticut
91 N. Eagleville Rd.
Storrs, CT 06269
860-486-2200

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Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

Any changes to the salinity of the water where the boat is kept?  You said
you get them from boatzincs.com.  Are you absolutely sure that you didn't
accidentally change between martz and camp or between aluminum, zinc, and
magnesium?  Did you make any changes to the bonding/ground system in the
boat?

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" 
wrote:

> When my boat was pulled from the water this year I was surprised to find
> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
> other was nearly gone.  I have had this configuration in past years and
> every other year at the end of the season I could barely justify replacing
> them because there was so little metal decay.  I know of nothing I did
> differently this year.  I am on a mooring so rarely plugged into shore
> power.  What would cause a dramatic increase in zinc decay?  Thanks and
> Happy Holidays to all!  Dave
>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
>
> ___
>
> Email address:
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> bottom of page at:
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>
>
>
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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

Hi Josh-
On Dec 24, 2015, at 4:20 PM, Josh Muckley via CnC-List  
wrote:

> Any changes to the salinity of the water where the boat is kept? 
> 
Same mooring in same place
> You said you get them from boatzincs.com.  Are you absolutely sure that you 
> didn't accidentally change between martz and camp or between aluminum, zinc, 
> and magnesium? 
> 
Not sure what martz means but I ordered the same part number each year.  All 
zinc.
> Did you make any changes to the bonding/ground system in the boat?
> 
Not that I know of
> 
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
> 
> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List"  
> wrote:
> When my boat was pulled from the water this year I was surprised to find that 
> the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
> nearly gone.  I have had this configuration in past years and every other 
> year at the end of the season I could barely justify replacing them because 
> there was so little metal decay.  I know of nothing I did differently this 
> year.  I am on a mooring so rarely plugged into shore power.  What would 
> cause a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  
> Dave
> 
> Aries
> 1990 C&C 34+
> New London, CT
> 
> 
> 
> 
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> 

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Dennis C. via CnC-List]

"Martz".  Two most popular zinc brands are Martyr and Camp.  I prefer Camp.

Dennis C.

On Sat, Dec 26, 2015 at 10:55 AM, David Knecht via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hi Josh-
> On Dec 24, 2015, at 4:20 PM, Josh Muckley via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> Any changes to the salinity of the water where the boat is kept?
>
> Same mooring in same place
>
> You said you get them from boatzincs.com.  Are you absolutely sure that
> you didn't accidentally change between martz and camp or between aluminum,
> zinc, and magnesium?
>
> Not sure what martz means but I ordered the same part number each year.
> All zinc.
>
> Did you make any changes to the bonding/ground system in the boat?
>
> Not that I know of
>
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
>> When my boat was pulled from the water this year I was surprised to find
>> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
>> other was nearly gone.  I have had this configuration in past years and
>> every other year at the end of the season I could barely justify replacing
>> them because there was so little metal decay.  I know of nothing I did
>> differently this year.  I am on a mooring so rarely plugged into shore
>> power.  What would cause a dramatic increase in zinc decay?  Thanks and
>> Happy Holidays to all!  Dave
>>
>> Aries
>> 1990 C&C 34+
>> New London, CT
>>
>> 
>>
>>
>> ___
>>
>> Email address:
>> CnC-List@cnc-list.com
>> To change your list preferences, including unsubscribing -- go to the
>> bottom of page at:
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>>
>>
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>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
>
> ___
>
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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

Got it. These were Camp X-4.  Dave

On Dec 26, 2015, at 12:02 PM, Dennis C. via CnC-List  
wrote:

> "Martz".  Two most popular zinc brands are Martyr and Camp.  I prefer Camp.
> 
> Dennis C.
> 
> On Sat, Dec 26, 2015 at 10:55 AM, David Knecht via CnC-List 
>  wrote:
> Hi Josh-
> On Dec 24, 2015, at 4:20 PM, Josh Muckley via CnC-List 
>  wrote:
> 
>> Any changes to the salinity of the water where the boat is kept? 
>> 
> Same mooring in same place
>> You said you get them from boatzincs.com.  Are you absolutely sure that you 
>> didn't accidentally change between martz and camp or between aluminum, zinc, 
>> and magnesium? 
>> 
> Not sure what martz means but I ordered the same part number each year.  All 
> zinc.
>> Did you make any changes to the bonding/ground system in the boat?
>> 
> Not that I know of
>> 
>> Josh Muckley
>> S/V Sea Hawk
>> 1989 C&C 37+
>> Solomons, MD
>> 
>> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" 
>>  wrote:
>> When my boat was pulled from the water this year I was surprised to find 
>> that the Max-prop zinc was gone, one of the shaft zincs was gone and the 
>> other was nearly gone.  I have had this configuration in past years and 
>> every other year at the end of the season I could barely justify replacing 
>> them because there was so little metal decay.  I know of nothing I did 
>> differently this year.  I am on a mooring so rarely plugged into shore 
>> power.  What would cause a dramatic increase in zinc decay?  Thanks and 
>> Happy Holidays to all!  Dave
>> 
>> Aries
>> 1990 C&C 34+
>> New London, CT
>> 
>> 
>> 
>> 
>> ___
>> 
>> Email address:
>> CnC-List@cnc-list.com
>> To change your list preferences, including unsubscribing -- go to the bottom 
>> of page at:
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>> 
>> 
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>> 
> 
> Aries
> 1990 C&C 34+
> New London, CT
> 
> 
> 
> 
> ___
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> 

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

Any chance there was more or less rain or tributary flow?  Boatzincs.Com
provides guidance for the use of aluminum, zinc and magnesium anodes based
on protected metals and salinity.  If the water became more or less
saltymaybe??

Josh
On Dec 26, 2015 12:09 PM, "David Knecht via CnC-List" 
wrote:

> Got it. These were Camp X-4.  Dave
>
> On Dec 26, 2015, at 12:02 PM, Dennis C. via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> "Martz".  Two most popular zinc brands are Martyr and Camp.  I prefer Camp.
>
> Dennis C.
>
> On Sat, Dec 26, 2015 at 10:55 AM, David Knecht via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Hi Josh-
>> On Dec 24, 2015, at 4:20 PM, Josh Muckley via CnC-List <
>> cnc-list@cnc-list.com> wrote:
>>
>> Any changes to the salinity of the water where the boat is kept?
>>
>> Same mooring in same place
>>
>> You said you get them from boatzincs.com.  Are you absolutely sure that
>> you didn't accidentally change between martz and camp or between aluminum,
>> zinc, and magnesium?
>>
>> Not sure what martz means but I ordered the same part number each year.
>> All zinc.
>>
>> Did you make any changes to the bonding/ground system in the boat?
>>
>> Not that I know of
>>
>>
>> Josh Muckley
>> S/V Sea Hawk
>> 1989 C&C 37+
>> Solomons, MD
>> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" <
>> cnc-list@cnc-list.com> wrote:
>>
>>> When my boat was pulled from the water this year I was surprised to find
>>> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
>>> other was nearly gone.  I have had this configuration in past years and
>>> every other year at the end of the season I could barely justify replacing
>>> them because there was so little metal decay.  I know of nothing I did
>>> differently this year.  I am on a mooring so rarely plugged into shore
>>> power.  What would cause a dramatic increase in zinc decay?  Thanks and
>>> Happy Holidays to all!  Dave
>>>
>>> Aries
>>> 1990 C&C 34+
>>> New London, CT
>>>
>>> 
>>>
>>>
>>> ___
>>>
>>> Email address:
>>> CnC-List@cnc-list.com
>>> To change your list preferences, including unsubscribing -- go to the
>>> bottom of page at:
>>> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
>>>
>>>
>>> ___
>>
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>> bottom of page at:
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>>
>>
>> Aries
>> 1990 C&C 34+
>> New London, CT
>>
>> 
>>
>>
>> ___
>>
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>> bottom of page at:
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>>
>>
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>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
>
> ___
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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

We are at the end of the Thames River where it enters Long Island Sound, but 
there is no current and it is pretty much salt water as far as I can tell.  We 
had so little rain last summer that I can’t imagine it was lower salinity that 
previous years. Dave

On Dec 26, 2015, at 12:27 PM, Josh Muckley via CnC-List  
wrote:

> Any chance there was more or less rain or tributary flow?  Boatzincs.Com 
> provides guidance for the use of aluminum, zinc and magnesium anodes based on 
> protected metals and salinity.  If the water became more or less 
> saltymaybe??
> 
> Josh
> 
> 

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

The camp x-4 zincs have a little copper ball in them that contacts the
shaft.  Any chance that they were making better or worse contact between
different years?  The yard guys wack the hell out of them while alternately
tightening the screws in a torque pattern.   Use a wire brush to clean and
rough up the shaft and the zinc before installing.

I'm kinda grasping at straws, sorry.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Dec 26, 2015 12:41 PM, "David Knecht via CnC-List" 
wrote:

> We are at the end of the Thames River where it enters Long Island Sound,
> but there is no current and it is pretty much salt water as far as I can
> tell.  We had so little rain last summer that I can’t imagine it was lower
> salinity that previous years. Dave
>
> On Dec 26, 2015, at 12:27 PM, Josh Muckley via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> Any chance there was more or less rain or tributary flow?  Boatzincs.Com
> provides guidance for the use of aluminum, zinc and magnesium anodes based
> on protected metals and salinity.  If the water became more or less
> saltymaybe??
>
> Josh
>
>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
>
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
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>
>
>
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Re: Stus-List Zinc decay

[Neil Gallagher via CnC-List]

David,

I'm at the other end of Long Island Sound, and I too noticed an 
unusually rapid deterioration of my shaft zinc.  Usually it's only 1/2 
gone over the whole season, but this year I could see it going much 
faster over the summer and it was totally gone, as is not there, when I 
was hauled out.


I haven't given it much thought until your post, but the water quality 
in LI Sound was different this year than in the recent past.  It was 
much more clear, and there was an incredible amount of fish in the 
Sound, even humpback whales in Hempstead Harbor.  Not sure if that has 
anything to do with increased galvanic activity, but now I'm wondering.


Neil Gallagher
Weatherly, 35-1
Glen Cove, NY



On 12/26/2015 12:40 PM, David Knecht via CnC-List wrote:
We are at the end of the Thames River where it enters Long Island 
Sound, but there is no current and it is pretty much salt water as far 
as I can tell.  We had so little rain last summer that I can't imagine 
it was lower salinity that previous years. Dave


On Dec 26, 2015, at 12:27 PM, Josh Muckley via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:


Any chance there was more or less rain or tributary flow? 
Boatzincs.Com  provides guidance for the use of 
aluminum, zinc and magnesium anodes based on protected metals and 
salinity.  If the water became more or less saltymaybe??


Josh




Aries
1990 C&C 34+
New London, CT




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Re: Stus-List Zinc decay

[phorvati . via CnC-List]

Sometimes its nothing you did.  My theory is that besides changing galvanic
properties of underwater metals, like prop, nut, shaft shark, at a worst
case  boat wiring deteriorates over time.  This could result in more stray
current.  Current not going back to negative of the bank, but instead
leaving via prop shaft and your zinc.   Obviously very small amount, but
enough over a season to notice deeper deterioration.
On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" 
wrote:
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Re: Stus-List Zinc decay

[Della Barba, Joe via CnC-List]

Did you spend ANY time on shorepower?
If you don’t have a galvanic isolator, you are at the mercy of the maintenance 
practices of everyone on the pier. Why buy zincs when you can use everyone 
else’s?
Joe DB
Coquina

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of phorvati . 
via CnC-List
Sent: Sunday, December 27, 2015 9:43 AM
To: cnc-list@cnc-list.com
Cc: phorvati .
Subject: Re: Stus-List Zinc decay


Sometimes its nothing you did.  My theory is that besides changing galvanic 
properties of underwater metals, like prop, nut, shaft shark, at a worst case  
boat wiring deteriorates over time.  This could result in more stray current.  
Current not going back to negative of the bank, but instead leaving via prop 
shaft and your zinc.   Obviously very small amount, but enough over a season to 
notice deeper deterioration.
On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" 
mailto:cnc-list@cnc-list.com>> wrote:
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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

I was on shore power for the C&C Rendesvous in Clinton, CT.  I don’t think I 
have a galvanic isolator.  I have looked at the pictures and don’t think I have 
seen anything like it. Where would it be installed?  Dave

On Dec 28, 2015, at 9:12 AM, Della Barba, Joe via CnC-List 
 wrote:

> Did you spend ANY time on shorepower?
> If you don’t have a galvanic isolator, you are at the mercy of the 
> maintenance practices of everyone on the pier. Why buy zincs when you can use 
> everyone else’s?
> Joe DB
> Coquina
>  
> From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of phorvati . 
> via CnC-List
> Sent: Sunday, December 27, 2015 9:43 AM
> To: cnc-list@cnc-list.com
> Cc: phorvati .
> Subject: Re: Stus-List Zinc decay
>  
> Sometimes its nothing you did.  My theory is that besides changing galvanic 
> properties of underwater metals, like prop, nut, shaft shark, at a worst case 
>  boat wiring deteriorates over time.  This could result in more stray 
> current.  Current not going back to negative of the bank, but instead leaving 
> via prop shaft and your zinc.   Obviously very small amount, but enough over 
> a season to notice deeper deterioration. 
> 
> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List"  
> wrote:
> ___
> 
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the bottom 
> of page at:
> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
> 

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Edd Schillay via CnC-List]

David,

Most likely in the port access hatch next to the helm seat (near the shore 
power connection outlet)


All the best,

Edd

---
Edd M. Schillay
Starship Enterprise
NCC-1701-B
C&C 37+ | City Island, NY
www.StarshipSailing.com
---
914.332.4400  | Office
914.774.9767  | Mobile
---
Sent via iPhone 6
iPhone. iTypos. iApologize

On Dec 28, 2015, at 8:50 PM, David Knecht via CnC-List  
wrote:

I was on shore power for the C&C Rendesvous in Clinton, CT.  I don’t think I 
have a galvanic isolator.  I have looked at the pictures and don’t think I have 
seen anything like it. Where would it be installed?  Dave

> On Dec 28, 2015, at 9:12 AM, Della Barba, Joe via CnC-List 
>  wrote:
> 


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Re: Stus-List Zinc decay

[Dennis C. via CnC-List]

It will be installed on the shore power ground wire somewhere between the
inlet receptacle to the breaker panel.

Dennis C.
Touche' 35-1 #83
Mandeville, LA

On Mon, Dec 28, 2015 at 7:50 PM, David Knecht via CnC-List <
cnc-list@cnc-list.com> wrote:

> I was on shore power for the C&C Rendesvous in Clinton, CT.  I don’t think
> I have a galvanic isolator.  I have looked at the pictures and don’t think
> I have seen anything like it. Where would it be installed?  Dave
>
> On Dec 28, 2015, at 9:12 AM, Della Barba, Joe via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> Did you spend ANY time on shorepower?
>
> If you don’t have a galvanic isolator, you are at the mercy of the
> maintenance practices of everyone on the pier. Why buy zincs when you can
> use everyone else’s?
>
> Joe DB
>
> Coquina
>
>
>
> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com
> ] *On Behalf Of *phorvati . via CnC-List
> *Sent:* Sunday, December 27, 2015 9:43 AM
> *To:* cnc-list@cnc-list.com
> *Cc:* phorvati .
> *Subject:* Re: Stus-List Zinc decay
>
>
>
> Sometimes its nothing you did.  My theory is that besides changing
> galvanic properties of underwater metals, like prop, nut, shaft shark, at a
> worst case  boat wiring deteriorates over time.  This could result in more
> stray current.  Current not going back to negative of the bank, but instead
> leaving via prop shaft and your zinc.   Obviously very small amount, but
> enough over a season to notice deeper deterioration.
>
> On Dec 24, 2015 11:48 AM, "David Knecht via CnC-List" <
> cnc-list@cnc-list.com> wrote:
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
>
>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
>
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
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>
>
>
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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

Last year, I posted the message below about unusual zinc consumption and got 
many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave

> On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
>  wrote:
> 
> When my boat was pulled from the water this year I was surprised to find that 
> the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
> nearly gone.  I have had this configuration in past years and every other 
> year at the end of the season I could barely justify replacing them because 
> there was so little metal decay.  I know of nothing I did differently this 
> year.  I am on a mooring so rarely plugged into shore power.  What would 
> cause a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  
> Dave
> 
> Aries
> 1990 C&C 34+
> New London, CT
> 
> 
> 
> ___
> 
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the bottom 
> of page at:
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> 

Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Matthew L. Wolford via CnC-List]

I have one for you: my bronze sink thru-hull (for the head, which is forward of 
the mast) was green and partially disintegrated when I pulled the boat this 
year.  The zinc on the shaft to protect the propeller was fine.  Thoughts?

Also, I just got my hard copy of the scam letter for USCG documentation 
renewal.  I was almost fooled, and I am aware of the scam.  These guys should 
be arrested for fraud.

From: David Knecht via CnC-List 
Sent: Tuesday, March 14, 2017 2:06 PM
To: CnC CnC discussion list 
Cc: David Knecht 
Subject: Re: Stus-List Zinc decay

Last year, I posted the message below about unusual zinc consumption and got 
many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave 

  On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
 wrote:

  When my boat was pulled from the water this year I was surprised to find that 
the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
nearly gone.  I have had this configuration in past years and every other year 
at the end of the season I could barely justify replacing them because there 
was so little metal decay.  I know of nothing I did differently this year.  I 
am on a mooring so rarely plugged into shore power.  What would cause a 
dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave 

  Aries
  1990 C&C 34+
  New London, CT

   

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Aries
1990 C&C 34+
New London, CT

 




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Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

Matthew,
Are you confident in the electrical connection between the through hull and
the shaft zinc? Zincs don't work unless they are in electrical contact with
the metal they are protecting.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" <
cnc-list@cnc-list.com> wrote:

I have one for you: my bronze sink thru-hull (for the head, which is
forward of the mast) was green and partially disintegrated when I pulled
the boat this year.  The zinc on the shaft to protect the propeller was
fine.  Thoughts?

Also, I just got my hard copy of the scam letter for USCG documentation
renewal.  I was almost fooled, and I am aware of the scam.  These guys
should be arrested for fraud.

*From:* David Knecht via CnC-List 
*Sent:* Tuesday, March 14, 2017 2:06 PM
*To:* CnC CnC discussion list 
*Cc:* David Knecht 
*Subject:* Re: Stus-List Zinc decay

Last year, I posted the message below about unusual zinc consumption and
got many insightful responses about possible causes.  I decided to do
nothing specific and see if it happened again this last season.  I can
report that the anodes were in good shape when the boat was pulled last
November- much the same as in previous years.  So I am going with the shore
power stray current suggestion, as I cruised to some new sites last year
and spent a few days plugged into shore power in a place I have not been
before or since.  So if that is correct, Joe Della Barba would be the
winner.   Maybe we should keep score in the future?  Perhaps have a Stump
the Chumps episode periodically ala Car Talk?  Dave


On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List <
cnc-list@cnc-list.com> wrote:

When my boat was pulled from the water this year I was surprised to find
that the Max-prop zinc was gone, one of the shaft zincs was gone and the
other was nearly gone.  I have had this configuration in past years and
every other year at the end of the season I could barely justify replacing
them because there was so little metal decay.  I know of nothing I did
differently this year.  I am on a mooring so rarely plugged into shore
power.  What would cause a dramatic increase in zinc decay?  Thanks and
Happy Holidays to all!  Dave

Aries
1990 C&C 34+
New London, CT



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Aries
1990 C&C 34+
New London, CT



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Re: Stus-List Zinc decay

[Matthew L. Wolford via CnC-List]

Not confident at all.  In fact, I’d be surprised if they were connected.

I am also surprised that whatever was going on near the thru-hull was 
apparently not going on 20 feet or so away near the prop, because the zinc back 
there is intact.  I would think that a stray current would not be so localized, 
but I’m no expert.

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 2:27 PM
To: C&C List 
Cc: Josh Muckley 
Subject: Re: Stus-List Zinc decay

Matthew, 
Are you confident in the electrical connection between the through hull and the 
shaft zinc? Zincs don't work unless they are in electrical contact with the 
metal they are protecting.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD


On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

  I have one for you: my bronze sink thru-hull (for the head, which is forward 
of the mast) was green and partially disintegrated when I pulled the boat this 
year.  The zinc on the shaft to protect the propeller was fine.  Thoughts?

  Also, I just got my hard copy of the scam letter for USCG documentation 
renewal.  I was almost fooled, and I am aware of the scam.  These guys should 
be arrested for fraud.

  From: David Knecht via CnC-List 
  Sent: Tuesday, March 14, 2017 2:06 PM
  To: CnC CnC discussion list 
  Cc: David Knecht 
  Subject: Re: Stus-List Zinc decay

  Last year, I posted the message below about unusual zinc consumption and got 
many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave 

On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
 wrote:

When my boat was pulled from the water this year I was surprised to find 
that the Max-prop zinc was gone, one of the shaft zincs was gone and the other 
was nearly gone.  I have had this configuration in past years and every other 
year at the end of the season I could barely justify replacing them because 
there was so little metal decay.  I know of nothing I did differently this 
year.  I am on a mooring so rarely plugged into shore power.  What would cause 
a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave 

Aries
1990 C&C 34+
New London, CT

 

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  Aries
  1990 C&C 34+
  New London, CT

   


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  All Contributions are greatly appreciated!






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All Contributions are greatly appreciated!

Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

Do you have a shaft coupling isolator/vibration dampener?  You might be
experiencing stray current on the thru-hull but the shaft might be
electrically isolated.

On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" <
cnc-list@cnc-list.com> wrote:

> Not confident at all.  In fact, I’d be surprised if they were connected.
>
> I am also surprised that whatever was going on near the thru-hull was
> apparently not going on 20 feet or so away near the prop, because the zinc
> back there is intact.  I would think that a stray current would not be so
> localized, but I’m no expert.
>
> *From:* Josh Muckley via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:27 PM
> *To:* C&C List 
> *Cc:* Josh Muckley 
> *Subject:* Re: Stus-List Zinc decay
>
> Matthew,
> Are you confident in the electrical connection between the through hull
> and the shaft zinc? Zincs don't work unless they are in electrical contact
> with the metal they are protecting.
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
>
> On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
> I have one for you: my bronze sink thru-hull (for the head, which is
> forward of the mast) was green and partially disintegrated when I pulled
> the boat this year.  The zinc on the shaft to protect the propeller was
> fine.  Thoughts?
>
> Also, I just got my hard copy of the scam letter for USCG documentation
> renewal.  I was almost fooled, and I am aware of the scam.  These guys
> should be arrested for fraud.
>
> *From:* David Knecht via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:06 PM
> *To:* CnC CnC discussion list 
> *Cc:* David Knecht 
> *Subject:* Re: Stus-List Zinc decay
>
> Last year, I posted the message below about unusual zinc consumption and
> got many insightful responses about possible causes.  I decided to do
> nothing specific and see if it happened again this last season.  I can
> report that the anodes were in good shape when the boat was pulled last
> November- much the same as in previous years.  So I am going with the shore
> power stray current suggestion, as I cruised to some new sites last year
> and spent a few days plugged into shore power in a place I have not been
> before or since.  So if that is correct, Joe Della Barba would be the
> winner.   Maybe we should keep score in the future?  Perhaps have a Stump
> the Chumps episode periodically ala Car Talk?  Dave
>
>
> On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> When my boat was pulled from the water this year I was surprised to find
> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
> other was nearly gone.  I have had this configuration in past years and
> every other year at the end of the season I could barely justify replacing
> them because there was so little metal decay.  I know of nothing I did
> differently this year.  I am on a mooring so rarely plugged into shore
> power.  What would cause a dramatic increase in zinc decay?  Thanks and
> Happy Holidays to all!  Dave
>
> Aries
> 1990 C&C 34+
> New London, CT
>
> 
>
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
>
>
> Aries
> 1990 C&C 34+
> New London, CT
>
>
> --
> ___
>
> This list is supported by the generous donations of our members. If you
> wish to make a contribution to offset our costs, please go to:
> https://www.paypal.me/stumurray
>
> All Contributions are greatly appreciated!
>
> ___
>
> This list is supported by the generous donations of our members. If you
> wish to make a contribution to offset our costs, please go to:
> https://www.paypal.me/stumurray
>
> All Contributions are greatly appreciated!
>
>
>
> --
> ___
>
> This list is supported by the generous donations of our members. If you
> wish to make a contribution to offset our costs, please go to:
> https://www.paypal.me/stumurray
>
> All Contributions are greatly appreciated!
>
> ___
>
> This list is supported by the generous donations of our members. If you
> wish to make a contribution to offset our costs, please go to:
> https://www.paypal.me/stumurray
>
> All Contributions are greatly appreciated!
>
>
___

This list is supported by the generous donations of our members. If you wish to 
make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

All Contributions are greatly appreciated!

Re: Stus-List Zinc decay

[Matthew L. Wolford via CnC-List]

Okay.  You’re already beyond my level of expertise.

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 2:44 PM
To: C&C List 
Cc: Josh Muckley 
Subject: Re: Stus-List Zinc decay

Do you have a shaft coupling isolator/vibration dampener?  You might be 
experiencing stray current on the thru-hull but the shaft might be electrically 
isolated.

On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

  Not confident at all.  In fact, I’d be surprised if they were connected.

  I am also surprised that whatever was going on near the thru-hull was 
apparently not going on 20 feet or so away near the prop, because the zinc back 
there is intact.  I would think that a stray current would not be so localized, 
but I’m no expert.

  From: Josh Muckley via CnC-List 
  Sent: Tuesday, March 14, 2017 2:27 PM
  To: C&C List 
  Cc: Josh Muckley 
  Subject: Re: Stus-List Zinc decay

  Matthew, 
  Are you confident in the electrical connection between the through hull and 
the shaft zinc? Zincs don't work unless they are in electrical contact with the 
metal they are protecting.

  Josh Muckley
  S/V Sea Hawk
  1989 C&C 37+
  Solomons, MD


  On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

I have one for you: my bronze sink thru-hull (for the head, which is 
forward of the mast) was green and partially disintegrated when I pulled the 
boat this year.  The zinc on the shaft to protect the propeller was fine.  
Thoughts?

Also, I just got my hard copy of the scam letter for USCG documentation 
renewal.  I was almost fooled, and I am aware of the scam.  These guys should 
be arrested for fraud.

From: David Knecht via CnC-List 
Sent: Tuesday, March 14, 2017 2:06 PM
To: CnC CnC discussion list 
    Cc: David Knecht 
Subject: Re: Stus-List Zinc decay

Last year, I posted the message below about unusual zinc consumption and 
got many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave 

  On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
 wrote:

  When my boat was pulled from the water this year I was surprised to find 
that the Max-prop zinc was gone, one of the shaft zincs was gone and the other 
was nearly gone.  I have had this configuration in past years and every other 
year at the end of the season I could barely justify replacing them because 
there was so little metal decay.  I know of nothing I did differently this 
year.  I am on a mooring so rarely plugged into shore power.  What would cause 
a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave 

  Aries
  1990 C&C 34+
  New London, CT

   

  ___

  Email address:
  CnC-List@cnc-list.com
  To change your list preferences, including unsubscribing -- go to the 
bottom of page at:
  http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com



Aries
1990 C&C 34+
New London, CT

 



___

This list is supported by the generous donations of our members. If you 
wish to make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

All Contributions are greatly appreciated!


___

This list is supported by the generous donations of our members. If you 
wish to make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

All Contributions are greatly appreciated!





--
  ___

  This list is supported by the generous donations of our members. If you wish 
to make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

  All Contributions are greatly appreciated!


  ___

  This list is supported by the generous donations of our members. If you wish 
to make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

  All Contributions are greatly appreciated!





___

This list 

Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

Next time you're at the boat just look for a coupling isolator and a ground
wire on the problematic thru-hull.

http://www.randdmarine.com/flexiblesc.asp

https://www.gcsmarine.com/content/drivesavers/drivesavers

Josh

On Mar 14, 2017 2:51 PM, "Matthew L. Wolford via CnC-List" <
cnc-list@cnc-list.com> wrote:

> Okay.  You’re already beyond my level of expertise.
>
> *From:* Josh Muckley via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:44 PM
> *To:* C&C List 
> *Cc:* Josh Muckley 
> *Subject:* Re: Stus-List Zinc decay
>
> Do you have a shaft coupling isolator/vibration dampener?  You might be
> experiencing stray current on the thru-hull but the shaft might be
> electrically isolated.
>
> On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
>> Not confident at all.  In fact, I’d be surprised if they were connected.
>>
>> I am also surprised that whatever was going on near the thru-hull was
>> apparently not going on 20 feet or so away near the prop, because the zinc
>> back there is intact.  I would think that a stray current would not be so
>> localized, but I’m no expert.
>>
>> *From:* Josh Muckley via CnC-List 
>> *Sent:* Tuesday, March 14, 2017 2:27 PM
>> *To:* C&C List 
>> *Cc:* Josh Muckley 
>> *Subject:* Re: Stus-List Zinc decay
>>
>> Matthew,
>> Are you confident in the electrical connection between the through hull
>> and the shaft zinc? Zincs don't work unless they are in electrical contact
>> with the metal they are protecting.
>>
>> Josh Muckley
>> S/V Sea Hawk
>> 1989 C&C 37+
>> Solomons, MD
>>
>> On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" <
>> cnc-list@cnc-list.com> wrote:
>>
>> I have one for you: my bronze sink thru-hull (for the head, which is
>> forward of the mast) was green and partially disintegrated when I pulled
>> the boat this year.  The zinc on the shaft to protect the propeller was
>> fine.  Thoughts?
>>
>> Also, I just got my hard copy of the scam letter for USCG documentation
>> renewal.  I was almost fooled, and I am aware of the scam.  These guys
>> should be arrested for fraud.
>>
>> *From:* David Knecht via CnC-List 
>> *Sent:* Tuesday, March 14, 2017 2:06 PM
>> *To:* CnC CnC discussion list 
>> *Cc:* David Knecht 
>> *Subject:* Re: Stus-List Zinc decay
>>
>> Last year, I posted the message below about unusual zinc consumption and
>> got many insightful responses about possible causes.  I decided to do
>> nothing specific and see if it happened again this last season.  I can
>> report that the anodes were in good shape when the boat was pulled last
>> November- much the same as in previous years.  So I am going with the shore
>> power stray current suggestion, as I cruised to some new sites last year
>> and spent a few days plugged into shore power in a place I have not been
>> before or since.  So if that is correct, Joe Della Barba would be the
>> winner.   Maybe we should keep score in the future?  Perhaps have a Stump
>> the Chumps episode periodically ala Car Talk?  Dave
>>
>>
>> On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List <
>> cnc-list@cnc-list.com> wrote:
>>
>> When my boat was pulled from the water this year I was surprised to find
>> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
>> other was nearly gone.  I have had this configuration in past years and
>> every other year at the end of the season I could barely justify replacing
>> them because there was so little metal decay.  I know of nothing I did
>> differently this year.  I am on a mooring so rarely plugged into shore
>> power.  What would cause a dramatic increase in zinc decay?  Thanks and
>> Happy Holidays to all!  Dave
>>
>> Aries
>> 1990 C&C 34+
>> New London, CT
>>
>> 
>>
>> ___
>>
>> Email address:
>> CnC-List@cnc-list.com
>> To change your list preferences, including unsubscribing -- go to the
>> bottom of page at:
>> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
>>
>>
>> Aries
>> 1990 C&C 34+
>> New London, CT
>>
>>
>> --
>> ___
>>
>> This list is supported by the generous donations of our members. If you
>> wish to make a contribution to offset our costs, please go to:
>> https://

Re: Stus-List Zinc decay

[Matthew L. Wolford via CnC-List]

Thanks.  There are two wires unconnected to anything in the cabinet near the 
thru-hull.  We did major repair work on this boat about five years ago, 
including replacing all the thru-hulls.  This is the only exposed bronze 
thru-hull, and one or both of the wires may have been disconnected for the 
repair and not reconnected.  I will attempt to follow them to see where they 
lead.  Not this week, however.  B. 

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 3:05 PM
To: C&C List 
Cc: Josh Muckley 
Subject: Re: Stus-List Zinc decay

Next time you're at the boat just look for a coupling isolator and a ground 
wire on the problematic thru-hull. 

http://www.randdmarine.com/flexiblesc.asp


https://www.gcsmarine.com/content/drivesavers/drivesavers


Josh 

On Mar 14, 2017 2:51 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

  Okay.  You’re already beyond my level of expertise.

  From: Josh Muckley via CnC-List 
  Sent: Tuesday, March 14, 2017 2:44 PM
  To: C&C List 
  Cc: Josh Muckley 
  Subject: Re: Stus-List Zinc decay

  Do you have a shaft coupling isolator/vibration dampener?  You might be 
experiencing stray current on the thru-hull but the shaft might be electrically 
isolated.

  On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

Not confident at all.  In fact, I’d be surprised if they were connected.

I am also surprised that whatever was going on near the thru-hull was 
apparently not going on 20 feet or so away near the prop, because the zinc back 
there is intact.  I would think that a stray current would not be so localized, 
but I’m no expert.

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 2:27 PM
To: C&C List 
    Cc: Josh Muckley 
Subject: Re: Stus-List Zinc decay

Matthew, 
Are you confident in the electrical connection between the through hull and 
the shaft zinc? Zincs don't work unless they are in electrical contact with the 
metal they are protecting.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD


On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

  I have one for you: my bronze sink thru-hull (for the head, which is 
forward of the mast) was green and partially disintegrated when I pulled the 
boat this year.  The zinc on the shaft to protect the propeller was fine.  
Thoughts?

  Also, I just got my hard copy of the scam letter for USCG documentation 
renewal.  I was almost fooled, and I am aware of the scam.  These guys should 
be arrested for fraud.

  From: David Knecht via CnC-List 
  Sent: Tuesday, March 14, 2017 2:06 PM
  To: CnC CnC discussion list 
  Cc: David Knecht 
  Subject: Re: Stus-List Zinc decay

  Last year, I posted the message below about unusual zinc consumption and 
got many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave 

On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
 wrote:

When my boat was pulled from the water this year I was surprised to 
find that the Max-prop zinc was gone, one of the shaft zincs was gone and the 
other was nearly gone.  I have had this configuration in past years and every 
other year at the end of the season I could barely justify replacing them 
because there was so little metal decay.  I know of nothing I did differently 
this year.  I am on a mooring so rarely plugged into shore power.  What would 
cause a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  
Dave 

Aries
1990 C&C 34+
New London, CT

 

___

Email address:
CnC-List@cnc-list.com
To change your list preferences, including unsubscribing -- go to the 
bottom of page at:
http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com



  Aries
  1990 C&C 34+
  New London, CT

   


--
  ___

  This list is supported by the generous donations of our members. If you 
wish to make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

  All Contributions are greatly appreciated!


  ___

  This list is sup

Re: Stus-List Zinc decay

[Josh Muckley via CnC-List]

You probably don't have to follow them.  Just take a voltage reading to
ground just to make sure they are not energized.  Then take a resistance to
ground.  Then take a resistance to your bounding system which may be the
same thing as ground.  Then just for kicks take a resistance reading to the
shaft.  It should be 0 ohms.

Josh

On Tue, Mar 14, 2017, 3:37 PM Matthew L. Wolford via CnC-List <
cnc-list@cnc-list.com> wrote:

> Thanks.  There are two wires unconnected to anything in the cabinet near
> the thru-hull.  We did major repair work on this boat about five years ago,
> including replacing all the thru-hulls.  This is the only exposed bronze
> thru-hull, and one or both of the wires may have been disconnected for the
> repair and not reconnected.  I will attempt to follow them to see where
> they lead.  Not this week, however.  B.
>
> *From:* Josh Muckley via CnC-List 
> *Sent:* Tuesday, March 14, 2017 3:05 PM
> *To:* C&C List 
> *Cc:* Josh Muckley 
> *Subject:* Re: Stus-List Zinc decay
> Next time you're at the boat just look for a coupling isolator and a
> ground wire on the problematic thru-hull.
>
> http://www.randdmarine.com/flexiblesc.asp
>
> https://www.gcsmarine.com/content/drivesavers/drivesavers
>
> Josh
>
> On Mar 14, 2017 2:51 PM, "Matthew L. Wolford via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
> Okay.  You’re already beyond my level of expertise.
>
> *From:* Josh Muckley via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:44 PM
> *To:* C&C List 
> *Cc:* Josh Muckley 
> *Subject:* Re: Stus-List Zinc decay
>
> Do you have a shaft coupling isolator/vibration dampener?  You might be
> experiencing stray current on the thru-hull but the shaft might be
> electrically isolated.
>
> On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
> Not confident at all.  In fact, I’d be surprised if they were connected.
>
> I am also surprised that whatever was going on near the thru-hull was
> apparently not going on 20 feet or so away near the prop, because the zinc
> back there is intact.  I would think that a stray current would not be so
> localized, but I’m no expert.
>
> *From:* Josh Muckley via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:27 PM
> *To:* C&C List 
> *Cc:* Josh Muckley 
> *Subject:* Re: Stus-List Zinc decay
>
> Matthew,
> Are you confident in the electrical connection between the through hull
> and the shaft zinc? Zincs don't work unless they are in electrical contact
> with the metal they are protecting.
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
>
> On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
> I have one for you: my bronze sink thru-hull (for the head, which is
> forward of the mast) was green and partially disintegrated when I pulled
> the boat this year.  The zinc on the shaft to protect the propeller was
> fine.  Thoughts?
>
> Also, I just got my hard copy of the scam letter for USCG documentation
> renewal.  I was almost fooled, and I am aware of the scam.  These guys
> should be arrested for fraud.
>
> *From:* David Knecht via CnC-List 
> *Sent:* Tuesday, March 14, 2017 2:06 PM
> *To:* CnC CnC discussion list 
> *Cc:* David Knecht 
> *Subject:* Re: Stus-List Zinc decay
>
> Last year, I posted the message below about unusual zinc consumption and
> got many insightful responses about possible causes.  I decided to do
> nothing specific and see if it happened again this last season.  I can
> report that the anodes were in good shape when the boat was pulled last
> November- much the same as in previous years.  So I am going with the shore
> power stray current suggestion, as I cruised to some new sites last year
> and spent a few days plugged into shore power in a place I have not been
> before or since.  So if that is correct, Joe Della Barba would be the
> winner.   Maybe we should keep score in the future?  Perhaps have a Stump
> the Chumps episode periodically ala Car Talk?  Dave
>
>
> On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> When my boat was pulled from the water this year I was surprised to find
> that the Max-prop zinc was gone, one of the shaft zincs was gone and the
> other was nearly gone.  I have had this configuration in past years and
> every other year at the end of the season I could barely justify replacing
> them because there was so little metal decay.  I know of nothing I did
> differently this year.  I am on a mooring so rarely plugged into shore
> power.  What would cause a dramatic increase 

Re: Stus-List Zinc decay

[Matthew L. Wolford via CnC-List]

Okay.  Thanks.

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 3:53 PM
To: cnc-list@cnc-list.com 
Cc: Josh Muckley 
Subject: Re: Stus-List Zinc decay

You probably don't have to follow them.  Just take a voltage reading to ground 
just to make sure they are not energized.  Then take a resistance to ground.  
Then take a resistance to your bounding system which may be the same thing as 
ground.  Then just for kicks take a resistance reading to the shaft.  It should 
be 0 ohms.  

Josh 


On Tue, Mar 14, 2017, 3:37 PM Matthew L. Wolford via CnC-List 
 wrote:

  Thanks.  There are two wires unconnected to anything in the cabinet near the 
thru-hull.  We did major repair work on this boat about five years ago, 
including replacing all the thru-hulls.  This is the only exposed bronze 
thru-hull, and one or both of the wires may have been disconnected for the 
repair and not reconnected.  I will attempt to follow them to see where they 
lead.  Not this week, however.  B. 

  From: Josh Muckley via CnC-List 
  Sent: Tuesday, March 14, 2017 3:05 PM
  To: C&C List 
  Cc: Josh Muckley 
  Subject: Re: Stus-List Zinc decay
  Next time you're at the boat just look for a coupling isolator and a ground 
wire on the problematic thru-hull. 

  http://www.randdmarine.com/flexiblesc.asp


  https://www.gcsmarine.com/content/drivesavers/drivesavers


  Josh 

  On Mar 14, 2017 2:51 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

Okay.  You’re already beyond my level of expertise.

From: Josh Muckley via CnC-List 
Sent: Tuesday, March 14, 2017 2:44 PM
To: C&C List 
Cc: Josh Muckley 
    Subject: Re: Stus-List Zinc decay

Do you have a shaft coupling isolator/vibration dampener?  You might be 
experiencing stray current on the thru-hull but the shaft might be electrically 
isolated.

On Mar 14, 2017 2:38 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

  Not confident at all.  In fact, I’d be surprised if they were connected.

  I am also surprised that whatever was going on near the thru-hull was 
apparently not going on 20 feet or so away near the prop, because the zinc back 
there is intact.  I would think that a stray current would not be so localized, 
but I’m no expert.

  From: Josh Muckley via CnC-List 
  Sent: Tuesday, March 14, 2017 2:27 PM
  To: C&C List 
  Cc: Josh Muckley 
  Subject: Re: Stus-List Zinc decay

  Matthew, 
  Are you confident in the electrical connection between the through hull 
and the shaft zinc? Zincs don't work unless they are in electrical contact with 
the metal they are protecting.

  Josh Muckley
  S/V Sea Hawk
  1989 C&C 37+
  Solomons, MD


  On Mar 14, 2017 2:24 PM, "Matthew L. Wolford via CnC-List" 
 wrote:

I have one for you: my bronze sink thru-hull (for the head, which is 
forward of the mast) was green and partially disintegrated when I pulled the 
boat this year.  The zinc on the shaft to protect the propeller was fine.  
Thoughts?

Also, I just got my hard copy of the scam letter for USCG documentation 
renewal.  I was almost fooled, and I am aware of the scam.  These guys should 
be arrested for fraud.

From: David Knecht via CnC-List 
Sent: Tuesday, March 14, 2017 2:06 PM
To: CnC CnC discussion list 
    Cc: David Knecht 
Subject: Re: Stus-List Zinc decay

Last year, I posted the message below about unusual zinc consumption 
and got many insightful responses about possible causes.  I decided to do 
nothing specific and see if it happened again this last season.  I can report 
that the anodes were in good shape when the boat was pulled last November- much 
the same as in previous years.  So I am going with the shore power stray 
current suggestion, as I cruised to some new sites last year and spent a few 
days plugged into shore power in a place I have not been before or since.  So 
if that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave 

  On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
 wrote:

  When my boat was pulled from the water this year I was surprised to 
find that the Max-prop zinc was gone, one of the shaft zincs was gone and the 
other was nearly gone.  I have had this configuration in past years and every 
other year at the end of the season I could barely justify replacing them 
because there was so little metal decay.  I know of nothing I did differently 
this year.  I am on a mooring so rarely plugged into shore power.  What would 
cause a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  
Dave 

  Aries
  1990 C&C 34+
  New London, CT

   

  ___

  Email address:
  CnC-List@

Re: Stus-List Zinc decay

[Della Barba, Joe via CnC-List]

Wow - do I get a prize :)
Joe
Coquina
C&C 35 MK I


From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht 
via CnC-List
Sent: Tuesday, March 14, 2017 14:07
To: CnC CnC discussion list 
Cc: David Knecht 
Subject: Re: Stus-List Zinc decay

Last year, I posted the message below about unusual zinc consumption and got 
many insightful responses about possible causes.  I decided to do nothing 
specific and see if it happened again this last season.  I can report that the 
anodes were in good shape when the boat was pulled last November- much the same 
as in previous years.  So I am going with the shore power stray current 
suggestion, as I cruised to some new sites last year and spent a few days 
plugged into shore power in a place I have not been before or since.  So if 
that is correct, Joe Della Barba would be the winner.   Maybe we should keep 
score in the future?  Perhaps have a Stump the Chumps episode periodically ala 
Car Talk?  Dave

On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:

When my boat was pulled from the water this year I was surprised to find that 
the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
nearly gone.  I have had this configuration in past years and every other year 
at the end of the season I could barely justify replacing them because there 
was so little metal decay.  I know of nothing I did differently this year.  I 
am on a mooring so rarely plugged into shore power.  What would cause a 
dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  Dave

Aries
1990 C&C 34+
New London, CT



___

Email address:
CnC-List@cnc-list.com<mailto:CnC-List@cnc-list.com>
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Aries
1990 C&C 34+
New London, CT

[cid:image001.png@01D29DB0.8FFE0540]

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Re: Stus-List Zinc decay

[Frederick G Street via CnC-List]

Yeah, one of Stu’s bottles of rum…   :^)

— Fred

Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI   :^(

> On Mar 15, 2017, at 4:21 PM, Della Barba, Joe via CnC-List 
>  wrote:
> 
> Wow – do I get a prize J
> Joe
> Coquina
> C&C 35 MK I
>  
>  
> From: CnC-List [mailto:cnc-list-boun...@cnc-list.com 
> <mailto:cnc-list-boun...@cnc-list.com>] On Behalf Of David Knecht via CnC-List
> Sent: Tuesday, March 14, 2017 14:07
> To: CnC CnC discussion list  <mailto:cnc-list@cnc-list.com>>
> Cc: David Knecht mailto:davidakne...@gmail.com>>
> Subject: Re: Stus-List Zinc decay
>  
> Last year, I posted the message below about unusual zinc consumption and got 
> many insightful responses about possible causes.  I decided to do nothing 
> specific and see if it happened again this last season.  I can report that 
> the anodes were in good shape when the boat was pulled last November- much 
> the same as in previous years.  So I am going with the shore power stray 
> current suggestion, as I cruised to some new sites last year and spent a few 
> days plugged into shore power in a place I have not been before or since.  So 
> if that is correct, Joe Della Barba would be the winner.   Maybe we should 
> keep score in the future?  Perhaps have a Stump the Chumps episode 
> periodically ala Car Talk?  Dave

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Re: Stus-List Zinc decay

[David Knecht via CnC-List]

Bragging rights? 

Virtual rum bottle?  


Or maybe we keep a annual tally and chip in $1 each for the winner?

Aries
1990 C&C 34+
New London, CT


> On Mar 15, 2017, at 5:21 PM, Della Barba, Joe via CnC-List 
>  wrote:
> 
> Wow – do I get a prize J
> Joe
> Coquina
> C&C 35 MK I
>  
>  
> From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David 
> Knecht via CnC-List
> Sent: Tuesday, March 14, 2017 14:07
> To: CnC CnC discussion list 
> Cc: David Knecht 
> Subject: Re: Stus-List Zinc decay
>  
> Last year, I posted the message below about unusual zinc consumption and got 
> many insightful responses about possible causes.  I decided to do nothing 
> specific and see if it happened again this last season.  I can report that 
> the anodes were in good shape when the boat was pulled last November- much 
> the same as in previous years.  So I am going with the shore power stray 
> current suggestion, as I cruised to some new sites last year and spent a few 
> days plugged into shore power in a place I have not been before or since.  So 
> if that is correct, Joe Della Barba would be the winner.   Maybe we should 
> keep score in the future?  Perhaps have a Stump the Chumps episode 
> periodically ala Car Talk?  Dave
>  
> On Dec 24, 2015, at 11:47 AM, David Knecht via CnC-List 
>  wrote:
>  
> When my boat was pulled from the water this year I was surprised to find that 
> the Max-prop zinc was gone, one of the shaft zincs was gone and the other was 
> nearly gone.  I have had this configuration in past years and every other 
> year at the end of the season I could barely justify replacing them because 
> there was so little metal decay.  I know of nothing I did differently this 
> year.  I am on a mooring so rarely plugged into shore power.  What would 
> cause a dramatic increase in zinc decay?  Thanks and Happy Holidays to all!  
> Dave
>  
> Aries
> 1990 C&C 34+
> New London, CT
> 
>  
>  
> ___
> 
> Email address:
> CnC-List@cnc-list.com
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> of page at:
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> 
>  
> Aries
> 1990 C&C 34+
> New London, CT
> 
> 
>  
> ___
> 
> This list is supported by the generous donations of our members. If you wish 
> to make a contribution to offset our costs, please go to:  
> https://www.paypal.me/stumurray
> 
> All Contributions are greatly appreciated!

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