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Type I submarine information


U-25, a Type I U-boat.
Class overview
BuildersDeschimag, Bremen
OperatorsType I submarine Kriegsmarine
Preceded bySpanish Type E1
Succeeded by
  • Type VII (patrol submarine)
  • Type IX (oceanic submarine)
Cost4,500,000 ℛ︁ℳ︁
In commission1936 – 1940
Planned2
Completed2
Lost2
General characteristics
Displacement
  • 862 t (848 long tons) surfaced
  • 982 t (966 long tons) submerged
  • Official displacement was 712 tons standard
Length72.39 m (237 ft 6 in)
Beam6.21 m (20 ft 4 in)
Draft4.30 m (14 ft 1 in)
Propulsion
  • Diesel-electric:
    • 2 × MAN M 8 V 40/46 8-cylinder diesel engines with 2,900–3,080 PS (2,860–3,040 shp; 2,130–2,270 kW)
    • 2 × BBC GG UB 720/8 double acting electric motors with 1,000 PS (990 shp; 740 kW)
Speed
  • 17.7–18.6 knots (32.8–34.4 km/h; 20.4–21.4 mph) surfaced
  • 8.3 knots (15.4 km/h; 9.6 mph) submerged
Range
  • 7,900 nmi (14,600 km; 9,100 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 78 nmi (144 km; 90 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth200 m (660 ft)
Complement4 officers, 39 enlisted
Armament
  • 6 × torpedo tubes (four bow, two stern)
  • 22 × 53.3 cm (21 in) torpedoes
  • 1 × 10.5 cm (4.1 in) SK C/32 naval gun (180 rounds)
  • anti-aircraft guns

The Type I U-boat was the first post–World War I attempt to produce an oceangoing submarine for Nazi Germany's Kriegsmarine. The type was based on the Spanish Type E-1[1] and Finnish CV707, which were both designed by Ingenieurskantoor voor Scheepsbouw.[2] Only two Type IAs were built.[3] They were not a successful design : due to its single rudder they had a large turning circle and were not very manoeuvrable. The gravity center of the U-boat was too forward so on the surface the type I had its propellers exposed when she was pitching. Whilst submerged there were problems with depth keeping and stability as air bubbles in the fuel tanks wobbled back and forth. Diving was very slow: at full speed and with six tons of negative buoyancy it took forty seconds to reach ten metres depth. As a result, the type was discontinued and a new type IX class oceangoing U-boats was designed.[4]

  1. ^ Gröner 1991, p. 39.
  2. ^ Rössler (2001), pp. 98-99.
  3. ^ Showell (2006), p. 73.
  4. ^ Paterson 2003, p. x-xi.

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