HMS C21

History
United Kingdom
Name	HMS C21
Builder	Vickers, Barrow
Laid down	4 February 1908
Launched	26 September 1908
Commissioned	18 May 1909
Fate	Sold, 5 December 1921
General characteristics
Class & type	C-class submarine
Displacement	290 long tons (290 t) surfaced; 320 long tons (330 t) submerged;
Length	142 ft 3 in (43.4 m)
Beam	13 ft 7 in (4.1 m)
Draught	11 ft 6 in (3.5 m)
Installed power	600 bhp (450 kW) petrol; 300 hp (220 kW) electric;
Propulsion	1 × 16-cylinder Vickers petrol engine; 1 × electric motor;
Speed	13 kn (24 km/h; 15 mph) surfaced; 8 kn (15 km/h; 9.2 mph) submerged;
Range	910 nmi (1,690 km; 1,050 mi) at 12 kn (22 km/h; 14 mph) on the surface
Test depth	100 feet (30.5 m)
Complement	2 officers and 14 ratings
Armament	2 × 18 in (450 mm) bow torpedo tubes

HMS C21 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1921.

History

United Kingdom
Name	HMS C21
Builder	Vickers, Barrow
Laid down	4 February 1908
Launched	26 September 1908
Commissioned	18 May 1909
Fate	Sold, 5 December 1921
General characteristics
Class & type	C-class submarine
Displacement	290 long tons (290 t) surfaced 320 long tons (330 t) submerged
Length	142 ft 3 in (43.4 m)
Beam	13 ft 7 in (4.1 m)
Draught	11 ft 6 in (3.5 m)
Installed power	600 bhp (450 kW) petrol 300 hp (220 kW) electric
Propulsion	1 × 16-cylinder Vickers petrol engine 1 × electric motor
Speed	13 kn (24 km/h; 15 mph) surfaced 8 kn (15 km/h; 9.2 mph) submerged
Range	910 nmi (1,690 km; 1,050 mi) at 12 kn (22 km/h; 14 mph) on the surface
Test depth	100 feet (30.5 m)
Complement	2 officers and 14 ratings
Armament	2 × 18 in (450 mm) bow torpedo tubes