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" <[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 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" <[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 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 <[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!
