rapid zinc loss?

[bill pittore]

So speaking of rapid zinc loss, I was wondering if I have this situation or if this amount of zinc loss is 'normal'. Here's a pic of a new zinc and the old zinc. The old zinc was in the water 4 months. I checked out the zinc protection on the boat using the test electrode and the numbers were well within the normal range. I tested with various combinations of shore power connections as well as no connections. I'm probably going to use a temporary zinc that I place overboard when at the dock to hopefully lower the deterioration of the prop zinc. 

Bill

[Jon Vez]

So many variables Bill. I used a test electrode weekly and would measure the weight of the Zinc (new vs used) when I replaced. I used the weight to confirm that my Anode tester was in spec. I replaced when it was about 40% by weight depleted…

I do know that some seasons our harbor has more salinity than others which also contributes to Zinc wear…

Sent from my iPad

On Feb 26, 2022, at 10:42 AM, bill pittore <bill.p...@gmail.com> wrote:

So speaking of rapid zinc loss, I was wondering if I have this situation or if this amount of zinc loss is 'normal'. Here's a pic of a new zinc and the old zinc. The old zinc was in the water 4 months. I checked out the zinc protection on the boat using the test electrode and the numbers were well within the normal range. I tested with various combinations of shore power connections as well as no connections. I'm probably going to use a temporary zinc that I place overboard when at the dock to hopefully lower the deterioration of the prop zinc. 

Bill

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[STEWART SMITH]

Bill my zincs (same as yours) last 5 to 6 months and at that time look larger than your spent one. Stu Smith Pelican #80

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[bill pittore]

Thanks Stu for the info. Are you in salt water or fresh? I'm in salt in Portland ME.

Bill

[ken magida]

I stay at a mooring and frequently anchor when cruising and avoid docks whenever possible. Therefore I don’t think I have the same concerns. However the first seven years or so I had the boat I used a zinc that attached directly to the shaft and had poor experiences with them. They either vaporized quickly or vibrated off so there was nothing left but the fitting. Then I learned about the type in Bill’s photo and after the season it is still there with at least half the zinc still present.

Ken

Sent from my iPad,

An intelligent device which corrects my typing.

On Feb 27, 2022, at 13:06, bill pittore <bill.p...@gmail.com> wrote:



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[STEWART SMITH]

Salt water in Dana Point, between San Diego and LA.

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