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Old 04-14-2012
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Ok, guess what that is. The circle on the keel

http://www.facebook.com/photo.php?fb...type=1&theater

I'm in the process of fairing a neglected keel, so what you see is epoxy fairing compound here and there. The $64 dollar question is, what's up with the circle?

I know already but thought this was interesting.
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Last edited by jppp; 04-14-2012 at 08:57 PM.
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

looks like an eel bite of sorts
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

Sucker mark from a giant squid ? Did you mean the white circle or the little circle on the aft edge of the keel that looks like a "keel zinc"?
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

The big circle. The mystery is what's behind it and why.

The small circle on the trailing edge is a zinc. I guess it's a clue.
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

Looks like a black hole. Some of the Hawking designed boats had them; somewhat more dense ballast material than lead.
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

I would be curious why there is a zinc on a keel.
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Old 04-14-2012
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Re: Ok, guess what that is. The circle on the keel

Some keels had a pocket in them so a threaded rod could be fitted with a nut inside the keel.
Doesn't look like the right place for that though.
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Old 04-15-2012
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Re: Ok, guess what that is. The circle on the keel

Lightweight filler where they cut a chunk of lead out to make the boat meet its rating? Used to see it done occasionally on IOR boats, especially the level raters that had to be at a specific rating.
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Old 04-15-2012
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Re: Ok, guess what that is. The circle on the keel

It's a bull's-eye for torpedo practice. Don't get too close to any naval bases.
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Old 04-15-2012
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Re: Ok, guess what that is. The circle on the keel

You've got a zinc on the keel, so the keel is not lead. Per SLB it is a window, not to lighten the keel but to add lead to increase ballast weight.
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