HMS B11

B11 with crew in 1914
History
United Kingdom
Name	B11
Builder	Vickers
Launched	21 February 1906
Completed	11 July 1906
Fate	Sold for scrap, 1919
General characteristics
Class and type	B-class submarine
Displacement	287 long tons (292 t) surfaced 316 long tons (321 t) submerged
Length	142 ft 3 in (43.4 m)
Beam	12 ft 7 in (3.8 m)
Draught	11 ft 2 in (3.4 m)
Installed power	600 bhp (447 kW) petrol 180 hp (130 kW) electric
Propulsion	1 × petrol engine 1 × electric motor
Speed	12 knots (22 km/h; 14 mph) (surfaced) 6.5 knots (12.0 km/h; 7.5 mph) (submerged)
Range	1,000 nmi (1,900 km; 1,200 mi) at 8.7 knots (16.1 km/h; 10.0 mph) on the surface
Test depth	100 feet (30.5 m)
Complement	2 officers and 13 ratings
Armament	2 × 18 in (450 mm) bow torpedo tubes

HMS B11 was the last of 11 B-class submarines built for the Royal Navy in the first decade of the 20th century. Completed in 1906, it is best known for carrying out a successful attack on the Ottoman battleship Mesûdiye in the Dardanelles, an action for which her captain received the Victoria Cross. It spent the remainder of its active life serving in the Mediterranean, being converted into a surface patrol boat late in the war. B11 was sold for scrap in 1919.