HMS D7

History
United Kingdom
Name	HMS D7
Builder	Chatham Dockyard
Laid down	14 February 1910
Launched	14 January 1911
Commissioned	14 December 1911
Fate	Sold 19 December 1921 to H. Pounds
General characteristics
Class and type	D-class submarine
Displacement	Surfaced= 483 tons / Submerged= 595 tons
Length	163.0 ft (49.7 m) (oa)
Beam	13.6 ft (4.1 m) (oa)
Propulsion	550 hp (410 kW) electric 1,750 hp (1,300 kW) diesel twin screws
Speed	Surfaced=*14.0 knots (25.9 km/h; 16.1 mph); Submerged= 10.0 knots (18.5 km/h; 11.5 mph) (design) 9.0 knots (16.7 km/h; 10.4 mph) (service);
Range	Surface=*2,500 nautical miles (4,600 km; 2,900 mi) at 10 knots (19 km/h; 12 mph); Submerged=45 nautical miles (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph);
Complement	25
Armament	3 x 18-inch (46 cm) torpedo tubes (2 forward, one aft)

HMS D7 was one of eight D-class submarines built for the Royal Navy during the first decade of the 20th century.