Or, try to remain undetected ahead of the convoy, submerge and come to about 3200 yards from it's path. Then launch the torps, a full salvo making sure to compensate the different distances from the targeted ships by the order in which you launch. IN this way, all torps will hit in approximately the same time.
This is not such a successful method, but in 90% of the cases you will remain undetected, and maybe get the chance to make a second attack.
Basically this is the night surface attack method used buy the Germans and also the Americans, but submerged in daylight.
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