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German submarine U-73 (1940)
German submarine ''U-73'' was a Type VIIB U-boat of Nazi Germany's ''Kriegsmarine'' during World War II. She was laid down by Vegesacker Werft, Germany as yard number 1 on 5 November 1939, launched on 27 July 1940 and commissioned on 30 September of the same year under ''Kapitänleutnant'' (''Kptlt.'') Helmut Rosenbaum.〔Lenton 1976 p. 151〕
''U-73'' carried out 15 patrols between early 1941 and late 1943, sinking eight ships and four warships. She also damaged a further three commercial vessels. She was part of five wolfpacks. She was sunk by two US warships, and , off the North African coast on 16 December 1943 at .
==Design==
German Type VIIB submarines were preceded by the shorter Type VIIA submarines. ''U-73'' had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 6 V 40/46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two BBC GG UB 720/8 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . ''U-73'' was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one , 220 rounds, and one anti-aircraft gun The boat had a complement of between forty-four and sixty.
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