SM U-4 (Germany)

For other ships with the same name, see German submarine U-4.

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 torpedos 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.

Bibliography

• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4. {{cite book}}: |work= ignored (help); Cite has empty unknown parameter: |last-author-amp= (help)
• Rössler, Eberhard (1985). U-Bootbau bis Ende des 1. Weltkriegs, Konstruktionen für das Ausland und die Jahre 1935-1945 (in German). Vol. I. Koblenz: Bernard & Graefe. ISBN 3-7637-5213-7. {{cite book}}: |work= ignored (help); Invalid |ref=harv (help)