HMS R12

	R-class submarine
History
United Kingdom
Name	HMS R12
Builder	Cammell Laird, Birkenhead
Laid down	1 December 1917
Launched	9 April 1918
Commissioned	29 October 1919
Decommissioned	December 1919
Fate	Sold, 21 February 1923
General characteristics
Class & type	R-class submarine
Displacement	410 long tons (417 t) surfaced; 503 long tons (511 t) submerged;
Length	163 ft 9 in (49.91 m)
Beam	15 ft 3 in (4.65 m)
Draught	11 ft 6 in (3.51 m)
Installed power	240 bhp (180 kW) (diesel); 1,200 hp (890 kW) (electric);
Propulsion	1 × diesel engine; 1 × electric motor;
Speed	9.5 knots (17.6 km/h; 10.9 mph) surfaced; 15 knots (28 km/h; 17 mph) submerged;
Range	2,400 nmi (4,400 km; 2,800 mi) at 9 knots (17 km/h; 10 mph) surfaced; 60 nmi (110 km; 69 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth	150 feet (45.7 m)
Complement	2 officers and 20 ratings
Sensors &; processing systems	Bow hydrophone array
Armament	6 × bow 18-inch (45 cm) torpedo tubes

HMS R12 was one of 10 R-class submarines built for the Royal Navy during the First World War. The boat was not completed before the end of the war and was sold for scrap in 1923.