HMS H21
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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 launched 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 Script error: No such module "convert". at the surface and Script error: No such module "convert". while submerged.[1] It had a total length of Script error: No such module "convert".,[2] a beam of Script error: No such module "convert"., and a draught of Script error: No such module "convert"..[3] It contained a diesel engines providing a total power of Script error: No such module "convert". and two electric motors each providing Script error: No such module "convert". power.[3] The use of its electric motors made the submarine travel at Script error: No such module "convert".. It would normally carry Script error: No such module "convert". of fuel and had a maximum capacity of Script error: No such module "convert"..[4]
The submarine had a maximum surface speed of Script error: No such module "convert". and a submerged speed of Script error: No such module "convert".. Post-H20 British H-class submarines had ranges of Script error: No such module "convert". at speeds of Script error: No such module "convert". when surfaced.[1][3] H21 was fitted with an anti-aircraft gun and four Script error: No such module "convert". torpedo tubes. Its torpedo tubes were fitted to the bows and the submarine was loaded with eight Script error: No such module "convert". torpedoes.[1] It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.[1]
References
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Bibliography
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