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U-7 class submarine (Austria-Hungary) : ウィキペディア英語版
German Type U 66 submarine

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The Type U 66 was a class of five submarines or U-boats operated by the German Imperial Navy ((ドイツ語:Kaiserliche Marine)) during World War I. The class is alternately referred to as the ''U-66''-class or the Type UD. The class was built by Germaniawerft of Kiel to their 506d design as the ''U-7''-class for the Austro-Hungarian Navy. The five boats were sold to the Imperial Germany Navy at the beginning of World War I when it was thought impossible for the submarines to reach the Mediterranean for delivery to Austria-Hungary.
The Austro-Hungarian Navy, after competitively evaluating six submarines of three foreign designs, selected the Germaniwerft 506d or Type UD design over a design from Whitehead & Co. for the ''U-7'' class. The boats, numbered ''U-7'' to ''U-11'', were designed to be long and displace between when surfaced and submerged. They were to be armed with five torpedo tubes and a deck gun. For propulsion the design called for twin diesel engines for surface running and twin electric motors for subsurface movement. The Austro-Hungarian Navy ordered the boats in February 1913 and construction began on the first boats in November.
After the outbreak of World War I in August 1914, the Austro-Hungarian Navy became convinced that delivery of the still-unfinished submarines to the Mediterranean via Gibraltar would be impossible. As a result, they sold the five boats to the Imperial German Navy in November 1914. The German Navy assigned the numbers ''U-66'' to ''U-70'' to the five submarines and had them redesigned and reconstructed to their specifications. These changes, which included a larger deck gun, increased the displacement of the U-boats by almost surfaced and nearly submerged.
All five boats saw active service, and four sank 18 or more ships. Only , sunk six days into her first war patrol in March 1916, had no successes. Two other boats, and disappeared in 1917. The remaining two U-boats, and , were surrendered to the United Kingdom and were broken up by 1921.
== Background ==
In 1904, the Austro-Hungarian Navy, after allowing the navies of other countries to pioneer submarine developments,〔Gardiner, p. 340.〕 ordered the Austrian Naval Technical Committee ((ドイツ語:Marinetechnisches Komitee ''or'' MTK)) to produce a submarine design.〔Sieche, p. 16.〕 When the Navy rejected the January 1905 MTK design and other designs submitted as part of a public competition as impracticable, they instead opted to order two submarines each of designs by Simon Lake, Germaniawerft, and John Philip Holland for a competitive evaluation.〔〔The Lake design became the Austro-Hungarian ''U-1'' class, the Germaniawerft design became the ''U-3'' class, and the Holland design became the ''U-5'' class.〕
Based on the trials results, the Austro-Hungarian Navy determined the characteristics that the next generation of Austro-Hungarian submarines should have. They were looking for a double-hulled submarine of about displacement with diesel propulsion. They also wanted a surface speed of , and for the boat to be armed with between three and five torpedo tubes.〔 The Austro-Hungarian Navy selected the Germaniawerft 506d design, also known as the Type UD, for the ''U-7'' class over the Type 48 design submitted by Whitehead & Co., primarily because of the lower cost.〔 The Navy ordered five boats on 1 February 1913.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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