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Originally Posted by TheDarkWraith
your UHS files were a little trickier to fix the problem of. With the changes you made the sub will keep depth now with the fix but at deep depths it will overshoot the ordered depth. The deeper you dive the more overshoot that happens. I can't seem to fix that part of it. You really only start to see this at depths >120m with UHS.
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The overshooting is not necessarily an issue. A submarine is not an elevator. Depending on speed, rate of dive, water conditions/temperature/salinity, weight, weight distribution, you can easily overshoot. This is more of a problem the deeper you go since air compresses and the rate of sinking increases with depth. A certain oscillation around the ordered depth until the diving officer gets it nice and stable would not be abnormal.
from wikipedia, but close enough:
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When submerged, the water pressure on submarine's hull can reach 4 MPa (580 psi) for steel submarines and up to 10 MPa (1,500 psi) for titanium submarines like Komsomolets, while interior pressure remains relatively unchanged. This difference results in hull compression, which decreases displacement. Water density also increases with depth, as the salinity and pressure are higher, but this incompletely compensates for hull compression, so buoyancy decreases as depth increases. A submerged submarine is in an unstable equilibrium, having a tendency to either fall or float to the surface. Keeping a constant depth requires continual operation of either the depth control tanks or control surfaces
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http://en.wikipedia.org/wiki/Submari...n_and_trimming