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Old 08-11-2011, 11:11   #1
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What Is this on the Bottom of My Boat ?

I pulled the boat for the winter (this is the first haul out since I've owned the boat), and I found this under the waterline (my hand is for scale). What is this, and what is it for?
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Old 08-11-2011, 11:15   #2
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Re: What is this on the bottom of my boat?

Looks like an old sacrificial zinc. Maybe this is why your prop fell off.
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Old 08-11-2011, 11:17   #3
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Re: What is this on the bottom of my boat?

Anode...
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Old 08-11-2011, 11:17   #4
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Re: What is this on the bottom of my boat?

Not 100% sure, but looks like your Zinc

And that someone has really gone to town bodging the fixings. PO's
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Old 08-11-2011, 11:32   #5
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Re: What Is this on the Bottom of My Boat ?

What is it connected to on the inside of the boat? When I bought my boat, I had the same affair. The through-hull next to it snapped off in my hand and when trying to remove the prop, it's blades crumbled. Luckily the rudder Gudgeon s were unaffected.
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Old 08-11-2011, 11:39   #6
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Re: What is this on the bottom of my boat?

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Originally Posted by David_Old_Jersey View Post
Not 100% sure, but looks like your Zinc

And that someone has really gone to town bodging the fixings. PO's
+1

Those fixings look like stainless. I recall reading somewhere that SS fixings should be avoided on anodes, as SS in contact with the zinc leads to a build up of something or other which creates a large electrical reistance, rendering the anode useless
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Old 08-11-2011, 11:44   #7
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Re: What Is this on the Bottom of My Boat ?

I was concerned about the zincs being gone, I just didn't know since I hadn't yet seen the underside of the boat. Over the course of the past year, the boat seemed to have less and less power. I just figured there were barnacles or something on the prop, but I guess it could have also been the blades disintegrating.
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Old 08-11-2011, 11:50   #8
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Re: What Is this on the Bottom of My Boat ?

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I was concerned about the zincs being gone, I just didn't know since I hadn't yet seen the underside of the boat. Over the course of the past year, the boat seemed to have less and less power. I just figured there were barnacles or something on the prop, but I guess it could have also been the blades disintegrating.
Not to cheer you up , but a close look at the shaft would be no bad idea. and your through hulls.
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Old 08-11-2011, 11:54   #9
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Re: What Is this on the Bottom of My Boat ?

The boat needs a serious examination, by a professional, as to the condition of all underwater metal.
If you replace zincs in that location, use bronze threaded rod, full nut inside, jam nut outside, with large bronze washers in and out. make rod long enough to accept zinc over rod, and bronze nut outside to hold zinc in place.
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Old 08-11-2011, 13:47   #10
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Re: What is this on the bottom of my boat?

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Originally Posted by Vasco View Post
Looks like an old sacrificial zinc. Maybe this is why your prop fell off.

+1 !!
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Old 08-11-2011, 13:52   #11
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Re: What Is this on the Bottom of My Boat ?

I hope it ain't screwed into the hull!!!!!!!!!!!
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Old 08-11-2011, 14:59   #12
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Re: What Is this on the Bottom of My Boat ?

I zinc you might have an electrolysis problem
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Old 08-11-2011, 15:02   #13
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Re: What Is this on the Bottom of My Boat ?

Hey bubba, I need to change the zinc. Hand me a phillips AND a flat.
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Old 08-11-2011, 15:27   #14
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Re: What is this on the bottom of my boat?

Quote:
Originally Posted by nigel1 View Post
+1

Those fixings look like stainless. I recall reading somewhere that SS fixings should be avoided on anodes, as SS in contact with the zinc leads to a build up of something or other which creates a large electrical reistance, rendering the anode useless
I think Bronze will do the same. Here was my scary project when I bought my boat.
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Old 08-11-2011, 15:43   #15
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Re: What Is this on the Bottom of My Boat ?

A Hawaiian symbol for Shaka
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