Quote:
Originally Posted by Stormfly
it would be good to know what force whas used to press water out of the boat using the regulation cells, also which maximum dept was allowed because pressforce have to be stronger then outside water pressure.
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We can guestimate it: to start a steady accent you'd need to blow 200-300l of water out (my wildguess).
Here is a link, it states:
Quote:
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The air flasks have a total capacity of 6200 liters (219 cu. ft.) at 2920 p.s.i. This is sufficient air to evacuate all main ballast, fuel ballast and bow and stern buoyancy tanks once at a depth of 180 feet, or 5.65 times the free air volume of these tanks. Most of them are located in the superstructure, but six flasks which are part of four banks are located in the maneuvering room and engine room.
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2920psi is 198atm, that means that at least theoretically we could blow out at least 6200 liter of water at any depth
up to 2000m in type IX.
But then of course you'd spent some air trimming while going to that depth so it is more like 600-700m... All that means that one could easily trim (and keep trimming) a undamaged boat at any depth in the operating depth range, in particular at speed when planes help. With all that I see no reason why the boat should accent or decent at any speed except dead stop. And at dead-stop I would expect to see some random depth oscilations not constant accent or descent.