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Old 04-12-2020, 17:47   #1
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Join Date: Nov 2020
Location: San Diego
Boat: Formosa Sea Tiger 41
Posts: 9
Which Zincs

I've just scraped the hull on my full keel Formosa 41 Ketch.
Diver suggested 1 1/2 collar zinc for the shaft. That seems easy to fix/replace.
Next zinc he suggested is ZHC5 zincs one for each side of rudder.
Is there a source explaining what zincs and sizes are needed per this boat and or others?
Seems like a lot, the zincs aren't cheap and quite large.
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Old 04-12-2020, 18:25   #2
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Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,467
Re: Which Zincs

You can overzinc but it’s tough to do on a fiberglass boat.
Zincs are insurence, they may seem expensive, but can really save money in the long run.
They have to be bonded to work of course.
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