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German submarine U-639
German submarine ''U-639'' was a Type VIIC U-Boat built for Nazi Germany's ''Kriegsmarine'' for service during World War II. She was laid down on 31 October 1941 at Blohm & Voss in Hamburg as yard number 615, launched on 22 July 1942 and went into service on 10 September 1942. ''U-639'' spent her entire career operating out of Norway. Over the course of four patrols she neither sank nor damaged any ships, and was sunk by the in the Kara Sea while on a minelaying mission.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-639'' 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 Germaniawerft F46 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-639'' was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one , 220 rounds, and an anti-aircraft gun. The boat had a complement of between forty-four and sixty.
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