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Originally Posted by Choronzon
This is my first experience with the XXI, so I defaulted to 1 - 2 knots silent running the same as I do in the other boats. I wasn't actually aware that I could effectively double that and still remain silent.
When I gave a quick burst up to 5 knots to reduce the downward drift, the escorts seemed to get a little excited and started pinging me. I stepped back to 2 knots to try and lose them again and they lost the contact. Perhaps that was just a coincidence
Just for giggles, I restarted the career and tested depth keeping at various depths and speeds and found I had no trouble maintaining whatever depth I selected. So, I assumed it was just a one-off occurrence. Then I ran into another convoy and the original scenario repeated itself (I was watching for it this time, so I managed to get away without getting crushed.)
So, it seems to happen only when I'm near other ships at a depth of 100+ meters travelling at 1 - 2 knots. If there are no contacts in the area, I can dive deep and move slow without a hitch. That's sure gonna make convoy attacks interesting this late in the war. I'll keep playing around and see if I can keep reproducing it on a consistent basis.
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As said, there are numerous factors influencing your bouyancy, one of them is water temperature (thus density/weight), the deeper the closer to 4 deg. Celsius, but also pressure (the deeper you go the less is your displacement, as the boat is compressed, as well as the air in tanks) water salinity and so on. It seems that whis was somehow simulated in SH3 (GWX?), as under certain depths boats tend to sink at slow speeds. :hmm:
In my VIIB/C speed of 2.8 knots was enough to gain positive trim, 2 was enough to maintain depth (zero trim), but not to go up. Just like planes - they tend to fall down when too slow.
As to the 'close to other ships or not' issue - did you test your boat bouyancy when
running silent? There should be significant difference in performance (ability to maintain positive trim at slow speed included) between the two states. When running silent, any boat equipment producing noise is switched off, it could include also pumps for trimming tanks... :hmm: I doubt it was modelled, but one never knows - this game hasn't stopped to surprise me.
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Originally Posted by Gezur(Arbeit)
Its nearly impossible to balance a sub under water, its easyer in periscope Depth, but when the temparature of the water hits 4° Celsius it has the smallest distances between the Atoms, and the Water will never be colder in the depth, because of this. so u have to make the boot as heavy, as the water around it, and thats nealy impossible, so u need some speed to keep the depth.
Its a physical phenomenon. just like in real life  |
Actually it would be the opposite - the heavier the water the easier to maintain depth/rise. At 4 deg. Celsius temperature water has the largest density (thus it's always 4 degrees deep in the sea [unless close to seismic regions]).