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U-139, originally designated "Project 46", was a class of large, long-range U-boats built during World War I by the Kaiserliche Marine. ==Description== Three large U-cruisers, designated Type 139, were ordered from Germaniawerft, Kiel, in August 1916. Displacing nearly 2,000 tons, and with a surface speed of , they were armed with 24 torpedoes and two 15 cm deck guns, and had a cruising range of around . They carried a large enough complement to furnish captured vessels with prize crews and their intended purpose was to capture or destroy merchantmen on the surface; their large-calibre deck guns and comparatively high speed allowed them to engage even armed merchant vessels. Unlike the earlier Type U-151 submarines, the Type 139 was designed from the outset for war service. Four bow and two stern torpedo tubes were fitted, but the main armament was the two 15 cm deck guns, which could be laid by a rangefinder on the aft section of the bridge. The conning tower's command centre was protected by 90mm armour against the guns typically carried by enemy merchant ships, while the pressure hull was thicker than usual at 25mm, so as to increase diving depth. The superstructure was also raised by 2m so that a shell hitting it would not penetrate the pressure hull. A Type 139 U-boat cost 8.7 million Marks at the time, the 15 cm guns accounting for around 7% of the cost. Three submarines of this type, , , and , were ordered. The later "Project 46(a)" specified even more powerful U-cruisers, of a similar displacement to the Type 139 boats, but with an increased surface speed of , and with two 88mm deck guns in addition to the two 150mm guns. An even larger U-cruiser was proposed under "Project 47", but never reached construction; it would have displaced 2,500 tons, had a top speed of , and been armed with four 150mm guns as well as 6 torpedo tubes, 2 of which would have fired to the side. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「German Type U 139 submarine」の詳細全文を読む スポンサード リンク
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