Some very useful info re: bonding systems here: https://www.reddit.com/r/sailing/comments/onkot6/can_someone_explain_bonding_systems/
On Fri, Nov 19, 2021 at 6:11 PM David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > Same bottom paint (Vivid) through all the relevant years. Dave > > > On Nov 19, 2021, at 6:05 PM, Donald Kern via CnC-List < > cnc-list@cnc-list.com> wrote: > > Dave, > > Did you change the bottom paint ? > Many years ago I had the eating the anodes problem and what I determined > was the bottom paint was conductive and was setting up hull surface loops > thru the paint. Further I found that all my bronze overboards had > connecting ground wire even though the piping was all plastic/pvc. I > removed all the overboard ground wires and changed to Int'l CSC bottom > paint. I now use a single new doughnut shaft anode every year and it is > approx 30-40% sacrificed at the end of the sailing season. > > Don Kern > *Fireball,* C&C35 Mk2 > Bristol, RI > > > On 11/19/2021 5:11 PM, David Knecht via CnC-List wrote: > > Some may remember a Stump the Chumps post I made back in 2015. At that > time, I had pulled the boat for the season and found that two of my three > anodes were gone, and the third barely present, which was something that > had never happened before. They were previously in such good shape that I > had to decide whether to reuse them the next season or not. We decided > that Joe deserved a prize for suggesting the idea that stray current in a > marina I stayed at for several days had eaten the anodes. I am afraid I am > going to have to recall the bottle of Rum that I never gave Joe. > > That year seemed an anomaly and every year since then, the anodes have > been in pretty good shape at the end of the season so I presumed Joe was > right and the problem was gone. Aries was hauled yesterday, so I went down > to winterize and cover today. To my surprise, the situation was much like > 2015: the prop anode was completely gone and one of the two shaft anodes > was gone. The other was nearly completely consumed with just a bit of > metal hanging on. What eliminates the stray current hypothesis is that I > never plugged into shore power at any time this season. I don’t really > understand stray currents, but I thought that if you don’t plug into shore > power, you are not going to have this problem. Is that correct and if so, > any new hypotheses? Nothing electrical on the boat has changed over the > last 3 years, so it is not some new wiring that I have done. Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu > > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu > > > Dr. David Knecht > Professor of Molecular and Cell Biology > University of Connecticut > 91 N. Eagleville Rd. > Storrs, CT 06269-3125 > > > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
