HMS H21 [SEP] manufacturer
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
H21
H21 or H-21 may refer to :
- British NVC community H21, a type of heath community in the
- Highway H21 (Ukraine), a
- HMS H21, a 1918 British Royal Navy H class submarine
- Piasecki H-21, a 1949 American helicopter
and also :
- H-21, the 1917 German Mata Hari spy code name
- Other disorders of iris and ciliary body code