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Moquia -> ASW test (8/20/2004 10:09:33 PM)
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With all the discussion about ASW I tried a little controlled test using scenario 4 (South Pacific 42). Head to head, fow off , japanese sub doctrine off and allied sub doctrine off.
ASW taskforce of 4 japanese destroyers (77/71, 77/74, 83/84, 84/88) with a ASW rating of 2 (Type 95) vs. US Gato class sub.
Round 1
Day 1: -
Day 2: Day ASW attack; 2 DDs fire; no hits
Day 2: Day Sub attack torpedoes miss; sub diving deep; no DDs fire
Day 3: Day ASW attack; sub diving deep; 1 DD fire; no hits
Day 4: -
Day 5: Night ASW attack; 2 DDs fire; no hits
Day 5: Day ASW attack; sub diving deep; no DDs fire
Day 5: Day ASW attack; 1 DD fire; no hits
Day 6: -
Day 7: -
Day 8: Day ASW attack; no DDs fire
Day 9: - (refuelling) tie
Round 2
Day 1: -
Day 2: -
Day 3: Day ASW attack; sub diving deep; no DDs fire
Day 4: Day ASW attack; 1 DD fire; no hits
Day 5: Night ASW attack; 1 DD fire; 3 hits (sub damage 35/53/0)
Round 3
Day 1: Night ASW attack; no DDs fire
Day 1: Day ASW attack; sub diving deep; no DDs fire
Day 1: Day ASW attack; sub diving deep; no DDs fire
Day 2: Night ASW attack; 1 DD fire; no hits
Day 3: -
Day 4: Day ASW attack; sub diving deep; 1 DD fire; no hits
Day 5: Day Sub attack; 1 torpedo hit; DD sunk; 1 DD fire; no hits
Round 4
Day 1: -
Day 2: Day ASW attack; 1 DD fire; no hits
Day 3: Day ASW attack; 1 DD fire; 1 hit (sub damage 18/25/0)
Round 5
Day 1 to 5: -
Day 6: Night ASW attack; 1 DD fire; no hits
Day 7: -
Day 8: Night ASW attack; 3 DDs fire; 6 hits; sub sinks
Round 6
Day 1 to 4: -
Day 5: Night sub attack; torpedo miss; 1 DD fire; no hits
Day 6: Night ASW attack; 1 DD fire; no hits
Day 7: Night ASW attack: 2 DDs fire; 5 hits; sub sinks
Round 7
Day 1: Night ASW attack; no DDs fire
Day 1: Day ASW attack; 3 DDs fire; no hits
Day 1: Day ASW attack; sub diving deep; 1 DD fire; no hits
Day 2: Day ASW attack; 1 DD fire; no hits
Day 3 to 5: -
Day 6: Night ASW attack; sub diving deep; 2 DDs fire; no hits
Day 7: Night ASW attack; 1 DD fire; no hits
Day 7: Day ASW attack; sub diving deep; 1 DD fire; no hits
Day 8: -
Day 9: Night ASW attack; 2 DDs fire; no hits; (refuelling) tie
Round 8
Day 1: Day ASW attack; no DDs fire
Day 2: Night ASW attack; sub diving deep; no DDs fire
Day 2: Day ASW attack; no DDs fire
Day 2: Day ASW attack; sub diving deep; No DDs fire
Day 3: Day ASW attack; 1 DD fire; 1 hit (sub damage 17/20/0)
Round 9
Day 1: Day sub attack; torpedo fail; sub diving deep; 1 DD fire; no hits
Day 2: Night ASW attack; no DDs fire
Day 3: -
Day 4: Day sub attack; torpedo fail; sub diving deep; 1 DD fire; no hits
Day 5: -
Day 6: -
Day 7: Night ASW attack; 1 DD fire; no hits
Day 7: Day ASW attack; 1 DD fire; 1 hit (sub damage 26/42/0)
Round 10
Day 1: Day sub attack; torpedo miss; sub diving deep; 1 DD fire; no hits
Day 2: Night ASW attack; no DDs fire
Day 3: Night ASW attack; 1 DD fire; no hits
Day 3: Night ASW attack; no DDs fire
Day 3: Day ASW attack; sub diving deep; no DDs fire
Day 3: Day ASW attack; sub diving deep; no DDs fire (4 attacks in 1 day)
Day 4 to 5: -
Day 6: Day ASW attack; no DDs fire
Day 7: Night ASW attack: 1 DD fire; no hits
Day 8 to 9: - (refuelling) tie
That’s 2 subs sunk and 4 damaged plus 1 destroyer sunk. 3 ties.
ASW taskforce of 4 US destroyers (72/38, 75/45, 76/43, 80/42) with a ASW rating of 2 (mk 7) vs. Japanese Type C1 class sub.
Round 1
Day 1: Day ASW attack; 1 DD fire; no hits
Day 2: Day ASW attack; 2 DDs fire; 4 hits; sub sinks
Round 2
Day 1: Day ASW attack; 1 DD fire; no hits
Day 2 to 3: -
Day 4: Day ASW attack; 1 DD fire; no hits
Day 5: -
Day 6: Day ASW attack; 1 DD fire; no hits
Day 6: Day ASW attack; no DDs fire
Day 7: Day ASW attack; 1 DD fire; no hits
Day 8: Night sub attack; torpedo hit; no DDs fire; DD sinks
Round 3
Day 1: Day ASW attack; 2 DDs fire; 3 hits; sub sinks
Round 4
Day 1 to 3: -
Day 4: Day sub attack; torpedo miss; sub diving deep; 1 DD fire; no hits
Day 5 to 6: -
Day 7: Day ASW attack; 1 DD fire; 2 hits
Day 7: Day ASW attack; 1 DD fire; 2 hits; sub sinks
Round 5
Day 1: Day sub attack; torpedo miss; no DDs fire
Day 2: Night sub attack; torpedo hit; DD damage 38/42/9; no DDs fire
Round 6
Day 1: Night ASW attack; 1 DD fire; 2 hits; sub sinks
Round 7
Day 1: Day ASW attack; 2 DDs fire; 3 hits; sub sinks
Round 8
Day 1: Day ASW attack; no DDs fire
Day 2: Night sub attack; torpedo hit; DD sinks; sub diving deep; no DDs fire
Day 2: Day ASW attack; sub diving deep; 2 DDs fire; no hits
Round 9
Day 1: -
Day 2: Day sub attack; torpedo miss; no DDs fire
Day 3: -
Day 4: Day ASW attack; 1 DD fire; 2 hits (sub damage 30/47/10)
Round 10
Day 1 to 4: -
Day 5: Day ASW attack; sub diving deep; 2 DDs fire; no hits
Day 6: -
Day 7: Day sub attack; torpedo miss; 1 DD fire; no hits
Day 8:-
Day 9: Day ASW attack; sub diving deep; no DDs fire (refuelling) tie
5 subs sunk and 1 damaged. 2 destroyers sunk plus 1 damaged. 1 tied
Conclusions from this small test:
The most important difference is the allied detection advantage. In 3 of the cases the US destroyers find and sink the sub the first day. Even though the allied sonar/asdic probably was better than the Japanese 60x60 miles is a lot of ocean (all airplanes was set to stand down). Also none of the destroyers had radar.
US subs can many times escape with damage and fight another day, IJN subs will more likely sink when hit. The mk 7 delivers almost twice the damage of the Type 95 (600 vs. 324). Both subs have nearly the same durability (30 vs. 33)
IJN destroyers attack more than US destroyers, but many times fail to hit. The Type 95 accuracy is less than the mk 7 (7 vs. 9). They also use their night experience to attack at night.
While allied ASW is more deadly than IJN ASW, the destroyers pay a higher prize. Maybe the mk-14 is to blame here.
US subs seems to dive deep more than IJN subs.
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