Hull Feature on Iowa BB

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#1 Post by **Erusia Force** » May 16th, 2012, 12:25 am

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

#2 Post by **TimothyC** » May 16th, 2012, 12:39 am

First thought would be zinks.

#3 Post by **Erusia Force** » May 16th, 2012, 12:40 am

So, corrosion protection?

#4 Post by **acelanceloet** » May 16th, 2012, 4:44 am

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.

#5 Post by **heuhen** » May 16th, 2012, 5:27 am

yeah that's correct that is zink,

#6 Post by **Erusia Force** » May 16th, 2012, 2:19 pm

So are those mounted on active ships or decommissioned and mothballed ships?

#7 Post by **Thiel** » May 16th, 2012, 2:35 pm

On all ships

#8 Post by **Erusia Force** » May 16th, 2012, 2:45 pm

Thank You!

#9 Post by **TimothyC** » May 16th, 2012, 5:40 pm

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.

#10 Post by **heuhen** » May 16th, 2012, 5:54 pm

It is also mounted on Fiberglas boats

Shipbucket

Hull Feature on Iowa BB

Hull Feature on Iowa BB

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