Type II submarine

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U-1, a Type IIA submarine and lead ship of the class
Class overview
Name	Type II Submarine
Builders	IIA : Deutsche Werke (6) IIB : Deutsche Werke (4), Germaniawerft (14), Flender Werke (2), Galați shipyard (6 re-assembled) IIC : Deutsche Werke (8) IID : Deutsche Werke (16)
Operators	Kriegsmarine  Soviet Navy (post war; U-9, U-18, U-24)
Preceded by	CV 707-type submarine
Succeeded by	Planned: Type XIII Actual: Type XVII (HTP-powered) Type XXIII (conventional)
Built	1934–1940
In commission	1935–1945
Completed	IIA : 6 IIB : 20 IIC : 8 IID : 16
General characteristics [1]
Type	Coastal submarine Training vessel
Displacement	IIA 254 tonnes (250 long tons) surfaced 303 t (298 long tons) submerged 381 t (375 long tons) total IIB 279 t (275 long tons) surfaced 328 t (323 long tons) submerged 414 t (407 long tons) total IIC 291 t (286 long tons) surfaced 341 t (336 long tons) submerged 435 t (428 long tons) total IID 314 t (309 long tons) surfaced 364 t (358 long tons) submerged 460 t (453 long tons) total
Length	IIA 40.90 m (134 ft 2 in) o/a 27.80 m (91 ft 2 in) pressure hull IIB 42.70 m (140 ft 1 in) o/a 28.20 m (92 ft 6 in) pressure hull IIC 43.90 m (144.0 ft) o/a 29.60 m (97 ft 1 in) pressure hull IID 43.97 m (144 ft 3 in) o/a 29.80 m (97 ft 9 in) pressure hull
Beam	IIA, IIB, IIC 4.081 m (13 ft 4.7 in) o/a 4 m (13 ft 1 in) pressure hull IID 4.916 m (16 ft 1.5 in) o/a 4 m (13 ft 1 in) pressure hull
Height	IIA, IIB 8.60 m (28 ft 3 in) IIC 8.382 m (27 ft 6.0 in) IID 8.10 m (26 ft 7 in)
Draught	IIA 3.83 m (12 ft 7 in) IIB 3.90 m (12 ft 10 in) IIC 3.82 m (12 ft 6 in) IID 3.93 m (12 ft 11 in)
Propulsion	2 × MWM RS 127 S 6-cylinder diesel engines, 700 PS (690 shp; 515 kW) 2 × SSW PG VV 322/36 double-acting electric motors, 360–375 PS (355–370 shp; 265–276 kW)
Speed	IIA 13 knots (24 km/h; 15 mph) surfaced 6.9 knots (12.8 km/h; 7.9 mph) submerged IIB 13 knots (24 km/h; 15 mph) surfaced 7 knots (13 km/h; 8.1 mph) submerged IIC 12 knots (22 km/h; 14 mph) surfaced 7 knots (13 km/h; 8.1 mph) submerged IID 12.7 knots (23.5 km/h; 14.6 mph) surfaced 7.4 knots (13.7 km/h; 8.5 mph) submerged
Range	IIA 1,600 nmi (3,000 km; 1,800 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 35 nmi (65 km; 40 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged IIB 3,100 nmi (5,700 km; 3,600 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 35–43 nmi (65–80 km; 40–49 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged IIC 3,800 nmi (7,000 km; 4,400 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 35–42 nmi (65–78 km; 40–48 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged IID 5,650 nmi (10,460 km; 6,500 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 56 nmi (104 km; 64 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	150 m (490 ft)
Complement	3 officers, 11 non-commissioned officers, 11 enlisted
Sensors and processing systems	Gruppenhorchgerät
Armament	3 × 53.3 cm (21 in) torpedo tubes (bow) 5 torpedoes or 1 torpedo and 9 TMB mines various 2 cm (0.79 in) C/30 anti-aircraft gun

The Type II U-boat was designed by Nazi Germany as a coastal U-boat, modeled after the CV-707 submarine, which was designed by the Dutch dummy company NV Ingenieurskantoor voor Scheepsbouw Den Haag (I.v.S) (set up by Germany after World War I in order to maintain and develop German submarine technology and to circumvent the limitations set by the Treaty of Versailles) and built in 1933 by the Finnish Crichton-Vulcan shipyard in Turku, Finland. It was too small to undertake sustained operations far away from the home support facilities. Its primary role was found to be in the training schools, preparing new German naval officers for command. It appeared in four sub-types.