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" < [email protected]> wrote: > Okay. You’re already beyond my level of expertise. > > *From:* Josh Muckley via CnC-List <[email protected]> > *Sent:* Tuesday, March 14, 2017 2:44 PM > *To:* C&C List <[email protected]> > *Cc:* Josh Muckley <[email protected]> > *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" < > [email protected]> 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 <[email protected]> >> *Sent:* Tuesday, March 14, 2017 2:27 PM >> *To:* C&C List <[email protected]> >> *Cc:* Josh Muckley <[email protected]> >> *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" < >> [email protected]> 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 <[email protected]> >> *Sent:* Tuesday, March 14, 2017 2:06 PM >> *To:* CnC CnC discussion list <[email protected]> >> *Cc:* David Knecht <[email protected]> >> *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 < >> [email protected]> 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: >> [email protected] >> 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! > > _______________________________________________ > > 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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