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Old 04-12-2006
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Zincs

What is the normal number of zincs on a boat and where are they located? I am aware of the one on prop, but where else?
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Configurations will vary from boat to boat, depending upon size and equipment. Typically, there is a prop shaft zinc and a hull zinc, which is internally wired to electrical ground. Both are shown in the picture of my boat's running gear below.


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A hull zinc is not that common in my experience so your boat may not have one. If it's not there now, don't worry about it.

The engine also could have a zinc or two.
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zincs

Our practice is to put two shaft zincs on the prop shaft. Install them as per instructions or they could come loose.

We do have a grounded hull zinc as well, but many boats do not. In fact ours is in bad shape but it is a faired-in type that we cannot find a replacement for here on the west coast.

Engine zincs should be in the raw water circuit somewhere.
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Typically a sailboat will carry one or two collar zincs on the prop shaft, space permitting.


A single, limited-clearance collar can be used in tight quarters (as is frequently found on boats full keels and attached rudders.)


Many boats have a cone-shaped zinc attached to the prop. This is typical when shaft space is so limited that no zinc can fit there. A special prop prop nut is required to accept these zincs.


Most 3-bladed feathering props are designed to accept a zinc as well.
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Often a rudderplate or "button" zinc will be mounted on the strut.



Hull zincs are less common, but are frequently found on Taiwan-built boats.


Screw-in "pencil" zincs are used in some engine designs.
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Red face Re: Zincs

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Old 04-24-2012
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Re: Zincs

My Alberg 30 has only a prop zinc, it bolts on the back of the prop.
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