NYGM ASDIC

[BigWalleye]

Originally Posted by Zosimus

I think perhaps you're overstating the case of the destroyers. In reality the US beat the U-boats with air power. A U-boat can easily stay underwater for 16 hours and at 2 knots that's 32 nautical miles covered–that's almost 60 kilometers. It would be impossible for a ship or even a group of ships to cover that much ground.

Planes, however, could easily sweep the area and report the U-boat location when it surfaced. If forced down a second time without proper venting and battery charge, the U-boat is basically toast.

Based on the results, it doesn't appear to be quite that cut and dried. According to uboat.net, 264 U-boats were sunk by surface ships, and 260 by aircraft. 37 more were sunk by simultaneous attacks. Clay Blair says that the first U-boat kill credited solely to an air attack was in late 1941, by which time some 60 U-boats had been sunk.

I've never run into a HK Group, but if I do my plan is to spend 24 hours under at 2 knots and then check the air. If I can go longer, I will. I don't know if SH3 models this, but I run my boat with a skeleton crew–the absolute minimum number of personnel that SH3 will accept. This should (fingers crossed) allow me to extend my underwater time to the maximum.

You plan works fine as long as you can lose sonar and hydrophone contact with the ASW force. But that, as they say, is a fact not in evidence. In my experience (and in the historical reading I have done), if you can break contact, you will get away, usually in much less than 24 hours. If you can't break contact, you will probably be depth charged into submission well before that time.

Oxygen consumption in the boat is modeled in h.sie's patches , the one called (wait for it!) Oxygen Supply. And yes, consumption depends on the number of men - and their activity. Loading torpedoes - bad. Silnet running - good. And you can adjust the quantity of reserve tanks carried.