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post #1 of Old 10-30-2008 Thread Starter
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SailChick20's Avatar
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Loose Annode

A couple months ago, I went underwater to pull some weeds wrapped around my propeller. In the process, noticed that my zinc anode was loose and migrating up and down the prop shaft. I went back under with a screwdriver and tried to tighten it, to no just wouldn't. This was also causing a knocking noise while motoring. It will freely move up/down the shaft, but stops about 4 inches from the hull (thankfully!).

I have been told that I should remove it, it's not needed in freshwater...and have been told by others to's a must.

The manuf. is Martec. This is from their website:

A Martec Bullet Nosed Zinc should be fitted to the shaft precisely leaving a ( 3/8" to 1/4" ) gap between it and the strut to let water thru the strut bearing. The prop should be fitted behind the strut the same way. So instead of three non-streamlined lumps dragging thru the water, you produce one smooth shape including prop, strut, and zinc. When this is not properly done the benefit of any low drag propeller will be severely compromised. All that effort and expense for the ultimate low drag bottom is voided by a poorly placed non-streamlined zinc and a dislocated prop.

My questions:
Do I need this? (assuming to minimize drag through water, and to protect the prop/shaft?)
How can I get the other one off to replace with new?

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Last edited by SailChick20; 10-30-2008 at 11:21 PM.
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