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The W class submarines were built for the Royal Navy as experimental boats. They were based on a French Schneider-Laubeuf design. The design for ''W3'' and ''W4'' was heavily modified to meet Royal Navy requirements, overcoming some of the deficiencies of the 'off the shelf' design. In particular, the drop-collars were removed in the later boats. Only 4 W class were built from 1913 to 1916. The first 2 boats took 15 and 17 months to build which at the time was a remarkable feat compared to other building times. The W class had a very good performance with excellent diving control and efficient venting and flooding systems. The W class did have problems with habitability but other than that, they were good submarines. All 4 of the W class submarine were transferred to the Italian Navy in August 1916, where they retained their numbering. *HMS ''W1'' launched 19 November 1914 *HMS ''W2'' launched 15 February 1915 *HMS ''W3'' launched 1 April 1915 *HMS ''W4'' launched 26 November 1915 == References == *''The Royal Navy Submarine Service, A centennial History'', by Antony Preston. * 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「British W-class submarine」の詳細全文を読む スポンサード リンク
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