Shipbucket

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

First thought would be zinks.

So, corrosion protection?

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.

yeah that's correct that is zink,

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

On all ships

Thank You!

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.

It is also mounted on Fiberglas boats