HMS L21

History
United Kingdom
Name	HMS L21
Ordered	December 1916
Builder	Vickers Limited, Barrow-in-Furness
Laid down	15 September 1917
Launched	11 October 1919
Fate	Sold for scrapping, February 1939
General characteristics
Class and type	L-class submarine
Displacement	914 long tons (929 t) surfaced; 1,089 long tons (1,106 t) submerged;
Length	238 ft 7 in (72.7 m)
Beam	23 ft 6 in (7.2 m)
Draught	13 ft 3 in (4.0 m)
Installed power	2,400 bhp (1,800 kW) (diesel); 1,600 hp (1,200 kW) (electric);
Propulsion	2 × diesel engines; 2 × electric motors;
Speed	17 kn (31 km/h; 20 mph) surfaced; 10.5 kn (19.4 km/h; 12.1 mph) submerged;
Range	3,800 nmi (7,000 km; 4,400 mi) at 10 kn (19 km/h; 12 mph) on the surface
Test depth	150 feet (45.7 m)
Complement	38
Armament	4 × bow 21 in (533 mm) torpedo tubes; 2 × beam 18 in (457 mm) torpedo tubes; 1 × 4-inch deck gun;

HMS L21 was a L-class submarine built for the Royal Navy during World War I. The boat was not completed before the end of the war and was sold for scrap in 1939.

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