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Subject: Submarine tech question?
Sentinel    1/20/2005 12:41:48 PM
How do the propeller drive shafts penetrate the hull and not leak at the seams? Obviously, there is a very tight joint. But, It seems to me that even a tight joint would leak some water, especially if that joint were exposed to pressure found at depths. Does anyone know??
 
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CJH    RE:Submarine tech question?   3/19/2005 9:35:02 PM
I found something at page 17 of http://www.dstan.mod.uk/data/02/304/02000200.pdf . On inboard engine powered boats, the propellor shaft goes through a stuffing box mounted on the inside of the hull and stuffed with a combination of grease and cotton. If the stuffing box is stuffed well very little water leaks in around the shaft. It looks as if submarines have a very tighter version of the stuffing box. The shaft goes through a box mounted to the hull. An annular ring fixed to the shaft confines the "sealing elements" against the end of the box.
 
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Kane47    Submarines do leak   5/15/2011 1:32:58 PM
Actually, submarines leak. Just not very much. The deeper they dive, the more they leak.
When they go past a certain depth, the navy rigs the boat for deep diving. Which means the that the places where the hull is penetrated is manned constantly to count the number of drops coming into the boat.
 
 
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