Quote:
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Originally Posted by Steeltrap
* Ability to "hover" (maintain depth without any forward way)
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Before some dev actually "corrects" this situation ...
"Safely out of Manila Bay and moving south in the South China Sea,
Sculpin made her trim drive, one of the first items of business for a submarine on leaving port. The dive was necessary to adjust the weight of the submarine to a condition of neutral buoyancy so the sub could submerge and the diving officer could keep the sub at the desired depth with little or no headway ... The compensation was made through a system consisting basically of a forward trim tank, an after trim tank, and an auxiliary tank located near the center of the boat. By pumping sea water between these tanks and from or to the sea, the diving officer could reach a condition of neutral buoyancy where the boat would stay put, like a balloon, with no need to use speed or control planes to maintain the desired depth."
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Submarine Diary, page 7, Algonquin Books of Chapel Hill, 1991, by Rear Admiral Corwin Mendenhall, U.S.N. (Ret.)