SM U-4 (Germany)

History

German Empire
Name:	U-4
Ordered:	13 August 1907
Builder:	Kaiserliche Werft Danzig
Cost:	1,629,000 Goldmark
Yard number:	DU 3
Launched:	18 May 1909
Commissioned:	1 July 1909
Decommissioned:	27 January 1919
Fate:	Broken up in 1919
General characteristics
Class and type:	German Type U 3 submarine
Displacement:	421 t (414 long tons) surfaced 510 t (500 long tons) submerged
Length:	51.28 m (168 ft 3 in) (o/a) 45.00 m (147 ft 8 in) (pressure hull)
Beam:	5.60 m (18 ft 4 in)
Draught:	3.05 m (10 ft)
Propulsion:	2 shafts 2 × Körting 8-cylinder two stroke paraffin motors with 600 PS (440 kW; 590 shp) 2 × Siemens-Schuckert electric motors with 1,030 PS (760 kW; 1,020 shp) 550 rpm surfaced 600 rpm submerged
Speed:	11.8 knots (21.9 km/h; 13.6 mph) surfaced 9.4 knots (17.4 km/h; 10.8 mph) submerged
Range:	1,800 nmi (3,300 km; 2,100 mi) at 12 knots (22 km/h; 14 mph) surfaced 50 nmi (93 km; 58 mi) at 4.5 knots (8.3 km/h; 5.2 mph) submerged
Test depth:	30 m (98 ft 5 in)
Boats & landing craft carried:	1 dingi
Armament:	4 × 45 cm (18 in) torpedo tubes (2 bow, 2 stern) 6 torpedoes 1 × 5 cm (2.0 in) SK L/40 gun (from 1915)
Service record
Commanders:	Friedrich Lützow

SM U-4 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-4 engaged in the naval warfare and took part in the First Battle of the Atlantic.