HMS K4

	HMS K4 beached on Walney Island
History
United Kingdom
Name	HMS K4
Builder	Vickers, Barrow-in-Furness
Laid down	28 June 1915
Launched	13 July 1916
Commissioned	1 January 1917
Fate	Sunk, 31 January 1918
General characteristics
Class & 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 (74 km; 46 mi) at 4 kn (7.4 km/h; 4.6 mph);
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 K4 was a British K-class submarine built by Vickers in Barrow-in-Furness. She was laid down on 28 June 1915 and commissioned on 1 January 1917, one year before the end of World War I.