HMS M21

History
United Kingdom
NameHMS M21
BuilderSir Raylton Dixon & Co.
Laid down1 March 1915
Launched27 May 1915
FateSunk 20 October 1918 off Dover
General characteristics
Class & typeM15 class monitor
Displacement540 tons
Length177 ft 3 in (54.03 m)
Beam31 ft (9.4 m)
Draught6 ft 9 in (2.06 m)
Propulsion
  • 2 shaft
  • Triple Expansion steam engines
  • 600 ihp
Speed11 knots
Complement69
Armament

HMS M21 was a First World War Royal Navy M15-class monitor. After service in the Mediterranean and the Dover Patrol, she struck a mine off Ostend in January 1918 and sank off Dover.

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