Most of the Liberty yards in 1943 began producing Victory ships, a larger and faster freighter that was to be capable of commercial use after the War. Liberty ships were a rush response to an emergency situation in 1940. There were not only engineering problems wih these ships, but they were also slow making them vulnerable to U-boat attacks. As the war progressed there was time to improve the basic design and to install more powerful steam turbine engines plnts to increase speed. Workers and the new yards became increasingly skilled. The result was the Victory Ships. They were slightly larger and were capable of joining the high speed convoys that were much safer. THey had better trim and stability, stronger hulls, and more efficient, electrically driven winches and windlasses sppeding loading and unlodung. Ultimately some 531 Victory ships built. [Jaffee, p. 14.] This was only a fraction of the numbr of Liberty Ships built. A factor here is that the Liberty Ship construction not only replaced the number of ships sunk by the U-boats, but significantly added to merchant fleet capacity. And by the time that Victory Ships began to be delivered, the Allies had turned the tide of war in the North Atlntic. The U-boat Fleet experienced Black May. The month opened with the battle for ONS-5, the hardest fought battle of the entire campign. There wee heavy losses, 13 Allied hips and six U-boats. The tactical improvements of the escorts finally was taking the battle to the U-boats. And after ONS-5 Allied losses steadily decreased and U-boat losses invreased. Adm Dönitz was forced to withdraw the U-boats from the North Atlantic sea lanes. After May massive Wolf Pack operations were over. Small scale operations were ontinued to force the Allies to devote major resources to the campign.
Jaffee, Capt. Walter W. The Lane Victory: The Last Victory Ship in War and in Peace (Glencannon Press: Palo Alto, 1997).
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