Brag thats almost exacly what i do when i hit a large convoy with a lot of escorts... you should mention though that if you advance to flank speed and make the turn you will almost guarantee yourself to be detected therfore if your shots have any kind of longer range to them you might wait until they are within 20 seconds of impact to start making a lot of noise.... otherwise the convoy may zig zag around your eels.
byt yea, it works... historically i guess they go for the sound of where the torpedo launch was heard? but you can be several hundred meters away from the scene and very deep by the time the first escort arrives.
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