Quote:
Originally Posted by Hitman
In any case, I think that even if you limit your programming to the clearly identified things, it is worth to continue the discussion because we might end up agreeing on a reasonable model for boat buoyancy that can be later implemented. This would allow fixing things like the humming bird situation, etc.
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This would be absolutely fantastic.
I found one more bit of information on buoyancy, in the U-boat Commander's Handbook:
181.) Always go down dynamically to a low depth! Flooding is a mistake: The submarine automatically becomes heavier with increasing depth (leaking of the stern stuffing boxes and other openings, reduction of volume (contraction) of the body of the submarine) and it may well happen that it drops to a greater depth than is intended. Consequently in diving to considerable depths, the maximum engine power should be used, and it is even advisable to pump out the boat (for example, in the case of Type VII, approximately 1 ton).
The way I read this, is that the boat loses 1 ton of buoyancy by diving to considerable depth (150-200 meters?). It is impossible to say what amount of this is caused by leaking and what amount by hull contraction. I would assume most of it is due to hull contraction, because even 1/10 ton is 100 liters of water, which sounds like a huge amount to just leak in.
So if a realistic buoyancy model is ever coded, changes caused by submarine depth might well be estimated as 1 ton of buoyancy for 150 or 200 meters (for a type VII).
Does anyone have numbers for real trims used, that is, how much positive buoyancy was normally used? Or any estimates of normal leakage figures for various depths? With these numbers it might be possible to calculate if a submerged submarine losing power and compressed air would actually rise to the surface or sink due to losing positive buoyancy from leakage.