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There is valuable and there is valuable.
The reduction gears tend to be valuable because they are the life of the ship, without them, the ship goes nowhere. But what makes them so valuable?
From my experience in merchant ships, they were so valuable because they were so hard to replace. They built the ship and then put the deck house over where the reduction gears were, so in order to replace them, one essentially was talking about scrapping the ship.
Now, maybe military ships are somewhat different in that category; the economics of ship use to scrap point is vastly interesting. But keep in mind that a prop shaft is not just a couple of pipes linked together. Here is a wonderful set up that is designed to push a several thousand ton vessel thru the water. The trick is how to set that up so the ship goes where it is suppose to .........
......... and all that force on the shaft doesn't drive that rod thru the hull of the ship.
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("I came over here to save her."--peeping tom boyfriend
"Some save,"--police detective as he watches the gurney with the fatally drilled body of the beautiful socialite leave, (w,stte), "Body Double")
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