HMS K7

History
Name:	HMS K7
Builder:	HM Dockyard Devonport
Laid down:	8 November 1915
Commissioned:	July 1917
Fate:	Sold, 9 September 1921
General characteristics
Class and type:	K-class submarine
Displacement:	1,980 long tons (2,010 t) surfaced 2,566 long tons (2,607 t) submerged
Length:	339 ft (103 m)
Beam:	26 ft 6 in (8.08 m)
Draught:	20 ft 11 in (6.38 m)
Propulsion:	2 × 10,500 shp (7.8 MW) Brown-Curtis or Parsons geared steam turbines 2 × Yarrow boilers 4 × 1,440 hp (1,070 kW) electric motors 1 × 800 hp (600 kW) Vickers diesel generator for charging batteries on the surface 2 × 3-blade 7 ft 6 in (2.29 m) diameter screws
Speed:	24 knots (44 km/h; 28 mph) surfaced 8 knots (15 km/h; 9.2 mph) submerged
Range:	Surfaced : 800 nmi (1,500 km; 920 mi) at 24 kn (44 km/h; 28 mph) 12,500 nmi (23,200 km; 14,400 mi) at 10 kn (19 km/h; 12 mph) Submerged : 8 nmi (15 km; 9.2 mi) at 8 kn (15 km/h; 9.2 mph) 40 nmi (46 mi; 74 km) at 4 kn (4.6 mph; 7.4 km/h)
Complement:	59 (6 officers and 53 ratings)
Armament:	8 × 18 in (460 mm) torpedo tubes, (4 beam, 4 bow) 8 × spare torpedoes 2 × 18 in torpedo tubes fitted on deck (later removed) 2 × BL 4 in (100 mm) Mk.XI guns 1 × 3 in (76 mm) gun

HMS K7 was a K class submarine built by HM Dockyard, Devonport. She was laid down on 8 November 1915 and commissioned in July 1917.

K7 was involved in the accident with the 4th Light Cruiser Squadron. She was also involved in the Battle of May Island exercise. K7 was damaged in the exercise by running over the sinking K4. K7 was sold on 9 September 1921 at Sunderland.

K7 displaced 1,800 long tons (1,800 t) when at the surface and 2,600 long tons (2,600 t) while submerged. It had a total length of 338 feet (103 m), a beam of 26 feet 6 inches (8.08 m), and a draught of 20 ft 11 in (6.38 m). The submarine was powered by two oil-fired Yarrow Shipbuilders boilers supplying one geared Brown-Curtis or Parsons steam turbine; this developed 10,500 ship horsepower (7,800 kW) to drive two 7 ft 6 in (2.29 m) screws. Submerged power came from four electric motors each producing 350 to 360 horsepower (260 to 270 kW). It was also had an 800 hp (600 kW) diesel engine to be used when steam was being raised, or instead of raising steam.

The submarine had a maximum surface speed of 24 kn (44 km/h) and a submerged speed of 9 to 9.5 kn (16.7 to 17.6 km/h). It could operate at depths of 150 ft (46 m) at 2 kn (3.7 km/h) for 80 nmi (150 km).K7 was armed with ten 18-inch (460 mm) torpedo tubes, two 4-inch (100 mm) deck guns, and a 3-inch (76 mm) anti-aircraft gun. Its torpedo tubes were fitted to the bows, the midship section, and two were mounted on the deck. Its complement was fifty-nine crew members.

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