When I make contact with a convoy my SOP is to run out to around 10-12km abreast of the outside escort and go to fast speed to overhaul them by about the same distance I then cut back into the path of the convoy at ahead slow decks awash and I can usually make a surface attack with no problem. If I go much faster than 3-4kt I find I get spotted more easily. You cannot go charging at them at 8kt and not expect them to either hear your diesels or spot your bowwave or wake! Don't forget AI sensors even early war include sound as well as vision and even a smattering of radar.
Slow down take your time and use a stealthy approach and you will find more success.
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