SM U-7 (Germany)

History
German Empire
Name:	U-7
Ordered:	8 April 1908
Builder:	Germaniawerft, Kiel
Cost:	2,540,000 Goldmark
Yard number:	149
Laid down:	6 May 1909
Launched:	28 July 1910
Commissioned:	18 July 1911
Fate:	Sunk by U-22 in a friendly fire incident, 26 dead.
General characteristics [1]
Class and type:	German Type U 5 submarine
Displacement:	505 t (497 long tons) surfaced 636 t (626 long tons) submerged
Length:	57.30 m (188 ft) (o/a) 43.10 m (141 ft 5 in) (pressure hull)
Beam:	5.60 m (18 ft 4 in) (o/a) 3.75 m (12 ft 4 in) (pressure hull)
Draught:	3.55 m (11 ft 8 in)
Installed power:	2 × Körting 6-cylinder and 2 × Körting 8-cylinder two stroke paraffin motors with 900 PS (660 kW; 890 shp) 2 × SSW electric motors with 1,040 PS (760 kW; 1,030 shp) 550 rpm surfaced 600 rpm submerged
Propulsion:	2 shafts 2 × 1.30 metres (4 ft 3 in) propellers
Speed:	13.4 knots (24.8 km/h; 15.4 mph) surfaced 10.2 knots (18.9 km/h; 11.7 mph) submerged
Range:	3,300 nmi (6,100 km; 3,800 mi) at 9 knots (17 km/h; 10 mph)
Test depth:	30 m (98 ft)
Boats & landing craft carried:	1 dingi
Complement:	4 officers, 24 men
Armament:	4 × torpedo tubes (2 each bow and stern) 6 45 cm (17.7 in) torpedoes 1 × 3.7 cm (1.5 in) Hotchkiss gun
Service record
Part of:	I Flotilla 1 August 1914 – 21 January 1915
Commanders:	Kptlt. Georg König[2] 1 August 1914 – 21 January 1915
Operations:	3 patrols
Victories:	None

SM U-7 was a Type U 5 U-boat, one of the 329 that served in the Imperial German Navy in World War I. U-7 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

Fate

On 21 January 1915, U-7 was torpedoed and sunk by SM U-22, which had mistaken her for an enemy submarine. Twenty-four crew were killed, and only one survived.

References

Bibliography

• Beesly, Patrick (1982). Room 40: British Naval Intelligence 1914-1918. London: H Hamilton. ISBN 978-0-241-10864-2. 
• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4. 
• Halpern, Paul G. (1995). A Naval History of World War I. New York: Routledge. ISBN 978-1-85728-498-0. 
• Koerver, Hans Joachim (2008). Room 40: German Naval Warfare 1914-1918. Vol I., The Fleet in Action. Steinbach: LIS Reinisch. ISBN 978-3-902433-76-3. 
• Koerver, Hans Joachim (2009). Room 40: German Naval Warfare 1914-1918. Vol II., The Fleet in Being. Steinbach: LIS Reinisch. ISBN 978-3-902433-77-0. 
• Rössler, Eberhard (1985). U-Bootbau bis Ende des 1. Weltkriegs, Konstruktionen für das Ausland und die Jahre 1935-1945. Die deutschen U-Boote und ihre Werften (in German). I. Koblenz: Bernard & Graefe. ISBN 3-7637-5213-7. 
• Roessler, Eberhard (1997). Die Unterseeboote der Kaiserlichen Marine. Bonn: Bernard & Graefe. ISBN 978-3-7637-5963-7. 
• Schroeder, Joachim (2002). Die U-Boote des Kaisers. Bonn: Bernard & Graefe. ISBN 978-3-7637-6235-4. 
• Spindler, Arno (1966) [1932]. Der Handelskrieg mit U-Booten. 5 Vols. Berlin: Mittler & Sohn. Vols. 4+5, dealing with 1917+18, are very hard to find: Guildhall Library, London, has them all, also Vol. 1-3 in an English translation: The submarine war against commerce. 

External links

• Photos of cruises of German submarine U-54 in 1916-1918.
• A 44 min. German film from 1917 about a cruise of the German submarine U-35.
• Helgason, Guðmundur. "WWI U-boats: U 7". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. 
• Room 40: original documents, photos and maps about World War I German submarine warfare and British Room 40 Intelligence from The National Archives, Kew, Richmond, UK.

Shipwrecks and maritime incidents in January 1915
Shipwrecks	1 Jan HMS Formidable 4 Jan: HMS C31 13 Jan: HMS Viknor, SM U-31 15 Jan: Saphir 18 Jan: HMS E10 21 Jan: SM U-7 24 Jan: SMS Blücher 26 Jan: Washingtonian
Other incidents	13 Jan: HMS Imperieuse 25 Jan: SMS Gazelle 26 Jan: HMS Britannia 31 Jan: Asama
1914 1915 1916 December 1914 February 1915

Coordinates: 53°25′48″N 6°02′00″E / 53.43000°N 6.03333°E / 53.43000; 6.03333