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I-201-class submarine
The were submarines of the Imperial Japanese Navy during World War II. These submarines were of advanced design, built for high underwater speed, and were known as or . The type name, was shortened to .〔The read as "Sentaka-Dai", but the read as "Kō-soku" and read as "Ō-gata" in Japanese.〕
They were one of the fastest submarine class built during World War II, second only to Walter Type XVII closed-cycle powered submarines. Twenty-three units were ordered from the Kure Navy Yard under the 1943 construction program. Due to the deteriorating war situation, only eight boats were laid down, and only three, numbered ''I-201'', ''I-202'' and ''I-203'', were completed before the end of the war. None of them saw operational use.
==Background==
In 1938 the Imperial Japanese Navy constructed an experimental high-speed submarine for evaluation purposes, which was designated for security purposes. Based on previous experience with high-speed, short-range midget submarines, Number 71 displaced only 230 tons surfaced with a length of . She could attain a submerged speed of over , making her the fastest submarine of her day. The results gained from experiments with Number 71 formed the basis for the I-201 class submarines.〔Stille, p. 38〕
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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