Debut: October 2016



.: Bob Williams' U-Boat Type IIa


Special Navy



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"U-boot (U-boat) Type IIA. Commissioned in 1935, it was still in service, in the North Sea, in 1945 - What it might have looked like after ten years in service (it was scrapped in 1945), From Oct 1938 to Jan 1940, U-3 was captained by Kplt. Joachim Schepke who went on to become a famous "U-Boot Ace"."

German Type II submarine

From Wikipedia, the free encyclopedia
U 1 Kriegsmarine.jpg
U-1, a Type IIA submarine and lead ship of the class
Class overview
Name: Type II Submarine
Built: 1934 -1940
In commission: 1935 -1945
  • IIA : 6
  • IIB : 20
  • IIC : 8
  • IID : 16
General characteristics [1]
Type: Coastal submarine
  • IIA
    • 254 tonnes (250 long tons) surfaced
    • 303 t (298 long tons) submerged
    • 381 t (375 long tons) total
    • 4.081 m (13 ft 4.7 in) o/a
    • 4 m (13 ft 1 in) pressure hull
    • 8.60 m (28 ft 3 in)
  • IIA
    • 3.83 m (12 ft 7 in)
  • IIA
    • 13 knots (24 km/h; 15 mph) surfaced
    • 6.9 knots (12.8 km/h; 7.9 mph) submerged
  • 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
Test depth: 150 m (490 ft)
Complement: 3 officers, 11 non-commissioned officers, 11 enlisted
Sensors and
processing systems:
  • 3 × 53.3 cm (21 in) torpedo tubes (bow)
  • torpedoes or 1 torpedo and 9 TMB mines
  • various 2 cm (0.79 in) 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 TurkuFinland. 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.


Germany was stripped of her U-boats by the Treaty of Versailles at the end of World War I, but in the late 1920s and early 1930s began to rebuild her armed forces. The pace of rearmament accelerated under Adolf Hitler, and the first Type II U-boat was laid down on 11 February 1935. Knowing that the world would see this step towards rearmament, Hitler reached an agreement with Britain to build a navy up to 35% of the size of the Royal Navy in surface vessels, but equal to the British in number of submarines. This agreement was signed on 18 June 1935, and U-1 was commissioned 11 days later.


The defining characteristic of the Type II was its tiny size. Known as the Einbaum ("dugout canoe"), it had the advantages over larger boats of the ability to work in shallow water, diving more quickly, and being more difficult to spot due to the low conning tower. However, it had a shallower maximum depth, short range, and cramped living conditions, and could carry fewer torpedoes.

The boat had a single hull, with no watertight compartments. There were three torpedo tubes forward (none aft), with space for another two torpedoes inside the pressure hull for reloads. A single 20 mm anti-aircraft gun was provided, but no deck gun was mounted.

Space inside was limited. The two spare torpedoes extended from just behind the torpedo tubes to just in front of the control room, and most of the 24-man crew lived in this forward area around the torpedoes, sharing 12 bunks. Four bunks were also provided aft of the engines for the engine room crew. Cooking and sanitary facilities were basic, and in this environment long patrols were very arduous.

Most Type IIs only saw operational service during the early years of the war, thereafter remaining in training bases. Six were stripped down to just a hull, transported by river and truck to Linz (on the Danube), and reassembled for use in the Black Sea against the Soviet Union.

In contrast to other German submarine types, few Type IIs were lost. This, of course, reflects their use as training boats, although accidents accounted for several vessels.

These boats were a first step towards re-armament, intended to provide Germany with experience in submarine construction and operation and lay the foundation for larger boats to build upon. Only one of these submarines survives to this day; the prototype CV-707, renamed Vesikko by the Finnish Navy which later bought it.

On 3 February 2008, The Telegraph reported that U-20 had been discovered by Selçuk Kolay, a Turkish marine engineer in 80 feet (24 m) of water off the coast of the Turkish city of Zonguldak. The paper also reported that Kolay knows where U-23 and U-19 are, scuttled in deeper water near U-20.[2]

Comparison of Finnish Crichton-Vulcan CV-707(U2A) to German Type II

CV-707 Type IIA U1-U6
Launched 11 May 1933 1939–1940
Displacement (tonnes)
Surfaced 254 254
Submerged 303 303
Total 381 381
Size (metres)
Length 40.90 40.90
Beam 4.10 4.10
Draft 4.20 3.80
Speed (knots)
Surfaced 13 13
Submerged 8 6.9
Range (nautical miles)
Surfaced 1,350 nmi (2,500 km; 1,550 mi) at 8 knots (15 km/h; 9.2 mph) 1,000 nmi (1,900 km; 1,200 mi) at 8 knots (15 km/h; 9.2 mph)
Submerged 40 nmi (74 km; 46 mi) at 4 knots (7.4 km/h; 4.6 mph) 35 nmi (65 km; 40 mi) at 4 knots (7.4 km/h; 4.6 mph)
Engine Diesel-electric Diesel-electric
2 × MWM Diesel 700 PS (690 shp; 510 kW) 2 × MWM Diesel 700 PS (690 shp; 510 kW)
2 × SSW Electric 360 PS (360 shp; 260 kW) 2 × SSW Electric 402 PS (397 shp; 296 kW)

Type IIA

The Type IIA was a single hull, all welded boat with internal ballast tanks. Compared to the other variants, it had a smaller bridge and could carry the German G7a, G7e torpedoes as well as TM-type torpedo mines. There were 2 periscopes in the conning tower; aerial (navigation) periscope at the front of the tower, and attack periscope in the middle of the tower. There were serrated net cutters in the bow. The net cutters were adopted from World War 1 boats but were quickly discontinued during World War 2.

Deutsche Werke AG, of Kiel built six Type IIAs in 1934 and 1935.

List of Type IIA submarines


Thanks Wikipedia!

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