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Originally Posted by Tonnage_Ace
Wierdest thing happened, I went down to 275m @ 1knot(50rpm) and I kept going! While no ships were within range, I went back up to 275m at ahead slow, and while the dive planes were at 0, I went back to 1 knot, I started drifting deeper again! I went to 230, 220 and 190m and it seems that, while I'm in the red on my depth gauge and I'm going really slow, the boat can't keep itself up!
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Not a bug. its acutaly fairly realistic. Whats unrealisitc is a sub maintiaining depth without forward motion of some sort. At least thats my understanding of it.
You dont see this behavior very much in VII boats, but you see it alot in the larger boats like the IX and XXI. Basically the deeper you go, the higher your absolulte minimum speed is to maintain depth. So if you go down real deep, and creep along at 1 kt to be as quiet as you can, you'll slowly lose depth.
While i cant prove it, my overall experience has been the longer you stay deep creeping along at 1 or 2 kt, the harder it is to surface. Ive had a few situations where it got particuarlly intresting because i felt i coudlnt speed up the screws to recover depth without being heard, and i coudlnt gain depth because i coudlnt increase my speed.
Its quite intresting when your boat is at a 30 degree incline, bow up, stern down, dogpadding.
It also makes turning manuvers impossible to do, because any reduction in forward momentum makes the boat drop another couple meters.
Usualy going at ALOT faster speed and ordering to surface (but stopping the asent at say 130 meters) will recover from it. Ive had one situation where i orderd to surface (but stopping it at a comfortable depth) at least twice in one encounter, and got to the point where that didnt work anymore and had to blow ballast.