HMS R12

R-class submarine
History
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 and type	R class submarine
Displacement	420 long tons (427 t) surfaced 500 long tons (508 t) submerged
Length	163 ft (50 m)
Beam	16 ft (4.9 m)
Draught	11 ft 6 in (3.51 m)
Propulsion	8-cylinder diesel engine, 480 hp (360 kW) 2 × electric motors, 1,200 hp (890 kW) total Single electric motor for low speed running One shaft
Speed	9.5 knots (17.6 km/h) surfaced 14 knots (26 km/h) submerged
Endurance	Submerged: 1 hour at 14 knots (26 km/h)
Complement	2 officers and 20 ratings
Sensors and processing systems	Bow hydrophone array
Armament	• 6 × 18 in (460 mm) torpedo tubes (forward) • 12 × Mark VIII 18 inch torpedoes

HMS R12 was a British R class submarine built by Cammell Laird at Birkenhead. She was laid down on 1 December 1917 and launched on 9 April 1918. R12 was commissioned on 29 October 1919. She came too late to see any combat in World War I, like most of the other R class submarines. R12 was paid off in December 1919, and sold on 21 February 1923 to J. Smith.

References

• Hutchinson, Robert, Submarines, War Beneath The Waves, from 1776 to the Present Day
• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.