SM U-7 (Germany)

For other ships with the same name, see German submarine U-7.

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 took part in the First Battle of the Atlantic.

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 in a friendly fire incident, 26 dead.
General characteristics [1]
Class & type	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 m (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

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.