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 <cnc-list@cnc-list.com> > *Sent:* Tuesday, March 14, 2017 2:27 PM > *To:* C&C List <cnc-list@cnc-list.com> > *Cc:* Josh Muckley <muckl...@gmail.com> > *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 <cnc-list@cnc-list.com> > *Sent:* Tuesday, March 14, 2017 2:06 PM > *To:* CnC CnC discussion list <cnc-list@cnc-list.com> > *Cc:* David Knecht <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 > > > 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 > > <pastedGraphic.tiff> > > _______________________________________________ > > 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! > >
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