The aim of the WW-II commerce war was to cut the life line to America, not starve the Brits. The main aim was military . I gather the allied WW-II ASW effort cost them ten times what the U-Boat war cost the KM.
Further the tonnage of munitions needed to mount the D-Day operation would still have taken until 1943 to transport and accumulate that much across the Atlantic. This presumes the other operations prior to D-Day [ N.AFRICA & ITALY] are still needed. If not it might be 42/43 , but that had nothing to do with KM.
If the KM had invested in Type IX U-Boats at the expense of warship construction during most of the war - they would have accumulated > 1000 boats boat's by VE-Day each allowing ~8 weeks per sortie, compared to 6 weeks for the Type VII U-Boats. Its not a game changer , but all other things being equal it should have delay D-Day - V-E Day , by 6 -12 months .
Further the tonnage of munitions needed to mount the D-Day operation would still have taken until 1943 to transport and accumulate that much across the Atlantic. This presumes the other operations prior to D-Day [ N.AFRICA & ITALY] are still needed. If not it might be 42/43 , but that had nothing to do with KM.
If the KM had invested in Type IX U-Boats at the expense of warship construction during most of the war - they would have accumulated > 1000 boats boat's by VE-Day each allowing ~8 weeks per sortie, compared to 6 weeks for the Type VII U-Boats. Its not a game changer , but all other things being equal it should have delay D-Day - V-E Day , by 6 -12 months .
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