For half the war period the Germans and USA had 'dud' torpedoes. Only the Japanese had decent torps.
what you're experiencing, is one of the failures of the German torps. You have to set the depth to minimum and impact detonator for best results.
Another problem is that if the torp hit the target at exactly 90 degrees or close to that, it'd break the firing pin = dud. Aim to hit your impact torps between 5 - 15 degrees off centre.
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