HMS H21
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 HMS H4, another submarine of the same class | |
| History | |
|---|---|
 United Kingdom | |
| Name | H21 |
| Builder | Vickers Limited, Barrow-in-Furness |
| Launched | 20 October 1917 |
| Commissioned | 28 January 1918 |
| Fate | Sold, 13 July 1926 |
| General characteristics | |
| Class & type | H-class submarine |
| Displacement |
|
| Length | 171 ft 0 in (52.12 m) |
| Beam | 15 ft 4 in (4.67 m) |
| Propulsion |
|
| Speed |
|
| Range |
|
| Complement | 22 |
| Armament |
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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 subgroup. 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.
