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Originally Posted by smg13
Why would I want to hover making noise? Uhm...maybe I am waiting in bad weather at periscope depth, for a convoy or a single ship to roll by...
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In good weather, a very good LI was actually able to make the boat hover without making noise at periscope depth (with the periscope raised). If he got the neutral buoyancy "almost right" by +/- a few kg, when e.g. the boat slowly sank deeper, the periscope going down in the water would add to the displacement - to the point where the buoyancy is exactly neutral.
@Sailor Steve:
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Underwater the sub needs to maintain a precise neutral bouyancy to not rise or sink, which requires a touch that only a modern computerized pumping system can maintain.
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Not necessarily "modern" or "computerized", systems like that were developed during WWII by Friedrich Tuschka for a company called Askania (a kind of mechanical computer, called "Eiserner LI" or "iron LI"). They were mounted in U 555 for trials, and later in U 235, U 236, U 867, U 1017 and U 2511.
After the war, this (still mechanical) system was further developed and used in german Type 205, (I think) 206 and some 209 export boats, as well as in several french submarine classes, until they were replaced with modern electronic devices.
