Quote:
Originally Posted by Frederf
It's a complex issue but, no I don't think it's been fixed in any patches. Someone would have mentioned it.
Standard procedure, at least near the surface, is to set the buoyancy purposefully negative so the boat has to be moving to plane up to periscope viewing depth. This way if anything goes wrong you simply sink a little deeper instead of broach, get spotted, and die.
Keeping exact trim is rather difficult. The overall buoyancy that keeps the boat at 60m and 65m are rather close. With time and effort one can "dial it in" more or less. With surface swells near the surface it's like trying to make a house of cards with the fan on.
Sinkikng down and then hovering at 0 kts to exactly 100m would take a lot of fiddling with the trim tanks and you might wobble up and down 10s of meters as trim was changed. Speed and planes help you get to a precise depth quickly. However there's no chance that at 0 kts and 100m the boat would inexorably sink out of control as the buoyancy can be changed.
There is a point of no return for submarines known as the critical depth where maximum available buoyancy authority is insufficient to achieve positive net buoyancy but that would be well below 100m in a Type VII.
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Very nice explanation, thx
