Quote:
Originally Posted by TheDarkWraith
what we need to do is 'clone' the sonar's and hydrophone's and reduce their effectiveness. Then assign these clones as the ship's hydrophone's and sonar's in the early years via the ship's .sns files. This would model the ship's hydrophone's and sonar's in the early years of the war more accurately 
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I do not know what is available, but is there only one type of SONAR/ASDIC available?
from my reading of Blair and other sources, the issue appears to be more one of crew rating than the equipment.
For example, I re-read part of Blair vol.1 last night on actions in september 1939. The RN started the war with with 175 destroyers, although only about half, the more modern ones had the up to date ASDIC equipment and crews trained in their operation. In sept. 1939, the RN formed their 4 fleet carriers into ASW groups guarded by the most modern destroyers. Results:
1. around sept. 15, U-30 was attacked by 3 fleet destroyers detached from the
HMS Ark Royal Group. They found her, tracked her and kept her down for 6 hours until U-30 managed to break contact and escape;
2.on sept 14, U-39 unsuccessfully attacked
HMS Ark Royal. It was attacked by 3 destroyers from the group which first tracked her in line abreast formation, each ship 1 mile apart, and then carried out multiple DC attacks most at 100-150 feet depth, but the last one with DCs set at 250 and 500 feet depth. The U-39 surfaced and scuttled.
3. in mid-september 39 again, U-27 attacked what it thought was a group of cruisers at dusk. It turned out to be 7 RN destroyers which counterattacked. U-27 dove "deep" to 120 meters (393 feet), but suffered a damaged prop shaft from the DCs. The U-Boat surfaced at night to try to escape, but was spotted, ran down and forced to scuttle.
obviously, these destroyers would probably be ranked "veteran" or "elite".