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Erusia Force
Post subject: Hull Feature on Iowa BBPosted: May 16th, 2012, 12:25 am
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Greetings, I have found a strange feature on the hull of Iowa class BBs that I can not find an explanation for. Can anyone identify this feature?

http://dl.dropbox.com/u/79264610/405px- ... peller.png


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TimothyC
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 12:39 am
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First thought would be zinks.

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Erusia Force
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 12:40 am
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So, corrosion protection?


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acelanceloet
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 4:44 am
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timothy's asumption is most likely correct.
that is: the perry has very similar zincs.

without these, magnetic cavitation will be eating the props and hull.

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heuhen
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 5:27 am
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yeah that's correct that is zink,


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Erusia Force
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 2:19 pm
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So are those mounted on active ships or decommissioned and mothballed ships?


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Thiel
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 2:35 pm
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On all ships

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Erusia Force
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 2:45 pm
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Thank You!


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TimothyC
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 5:40 pm
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Erusia Force wrote:
So are those mounted on active ships or decommissioned and mothballed ships?
Whenever you have two different metals in a non-neutral solution, you get electrolytic activity that chemically eats away at one or both of the metals. The Zinc is there to sacrificially degrade so that the other, more important bits of metal (like the propeller) doesn't.

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heuhen
Post subject: Re: Hull Feature on Iowa BBPosted: May 16th, 2012, 5:54 pm
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It is also mounted on Fiberglas boats


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