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HMS H21
HMS ''H21'' was a British H class submarine built by Vickers Limited, Barrow-in-Furness, as the first of the Batch 3 H class submarines. She was laid down on 20 October 1917 and was commissioned on 28 January 1918. ''H21'' was an improved design of the H class which produced a larger displacement and the latest 21 inch torpedo tubes replacing the old 18 inch torpedo tubes. This would be incorporated into all batch 3 H class submarines. HMS ''H21'' was sold to John Cashmore Ltd on 13 July 1926 for scrapping at Newport.
==Design==
Like all post-''H20'' British H-class submarines, ''H21'' had a displacement of at the surface and while submerged.〔(【引用サイトリンク】title=H-class )〕 It had a total length of , a beam length of , and a draught length of .〔 It contained a diesel engines providing a total power of and two electric motors each providing power.〔 Retrieved from (Naval-History ) on 20 August 2015.〕 The use of its electric motors made the submarine travel at . It would normally carry of fuel and had a maximum capacity of .
The submarine had a maximum surface speed of and a submerged speed of . Post-''H20'' British H-class submarines had ranges of at speeds of when surfaced.〔〔 ''H21'' was fitted with an anti-aircraft gun and four torpedo tubes. Its torpedo tubes were fitted to the bows and the submarine was loaded with eight torpedoes.〔 It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.〔
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