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Italian R-class submarine : ウィキペディア英語版
Italian R-class submarine

The R-class or ''Romolo''-class submarine was a group of submarines built for the Royal Italian Navy (''Regia Marina Italiana'') during World War II. They were designed as blockade running transport submarines for transporting high-value cargo from Europe to Japan and vice versa. Axis-occupied Europe lacked strategic materials such as tungsten, tin and some commodities such as rubber.

==Design and description==
The R-class submarines displaced surfaced and submerged. The submarines were long, had a beam of and a draft of . They had a cargo capacity of .
〔Chesneau, p. 307〕
For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the R class had a range of at ; submerged, they had a range of at .〔Bagnasco, p. 166〕
The boats were only armed for self-defense with three light anti-aircraft guns. Some boats may have been equipped with a pair of internal torpedo tubes in the bow and stern.〔

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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