The Type II U-boat was designed by
Nazi Germany
Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
as a
coastal U-boat
U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic warfare role ...
, 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
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
in order to maintain and develop German
submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely op ...
technology and to circumvent the limitations set by the
Treaty of Versailles
The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June ...
) and built in 1933 by the Finnish
Crichton-Vulcan
Crichton-Vulcan is an abandoned shipyard in Turku, Finland, that once formed the cornerstone of the Finnish shipbuilding industry. The shipyard is best known for the World War II coastal defence ships and submarines it produced.
Shipbuild ...
shipyard in
Turku
Turku ( ; ; sv, Åbo, ) is a city and former capital on the southwest coast of Finland at the mouth of the Aura River, in the region of Finland Proper (''Varsinais-Suomi'') and the former Turku and Pori Province (''Turun ja Porin lääni''; ...
,
Finland
Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...
. 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.
Background
Germany was stripped of its U-boats by the
Treaty of Versailles
The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June ...
at the end of
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, but in the late 1920s and early 1930s began to rebuild its armed forces. The pace of rearmament accelerated under
Adolf Hitler
Adolf Hitler (; 20 April 188930 April 1945) was an Austrian-born German politician who was dictator of Nazi Germany, Germany from 1933 until Death of Adolf Hitler, his death in 1945. Adolf Hitler's rise to power, He rose to power as the le ...
, 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
The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...
in surface vessels, but equal to the British in number of submarines. This agreement was signed on 18 June 1935, and was commissioned 11 days later.
Design
The defining characteristic of the Type II was the small size, its surfaced displacement being between half and one third that of the
Type VII
Type VII U-boats were the most common type of German World War II U-boat. 703 boats were built by the end of the war. The lone surviving example, , is on display at the Laboe Naval Memorial located in Laboe, Schleswig-Holstein, Germany.
Conc ...
, and one third to one fourth of the
Type IX
The Type IX U-boat was designed by Nazi Germany's '' Kriegsmarine'' in 1935 and 1936 as a large ocean-going submarine for sustained operations far from the home support facilities. Type IX boats were briefly used for patrols off the eastern Un ...
's (depending on the variants used for comparison).
Known as the ''Einbaum'' ("dugout canoe"), it had some advantages over larger boats, chiefly its ability to work in shallow water, dive quickly, and increased stealth due to the low
conning tower
A conning tower is a raised platform on a ship or submarine, often armored, from which an officer in charge can conn the vessel, controlling movements of the ship by giving orders to those responsible for the ship's engine, rudder, lines, and gro ...
. However, it had a shallower maximum depth, short range, cramped living conditions, and carried fewer
torpedo
A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, su ...
es.
The boat had a single hull, with no watertight compartments. There were three torpedo tubes, all forward, with space for two spare torpedoes inside the pressure hull. Although the boats technically had a deck gun, it was a 20mm weapon best used for defense against aircraft.
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 their hulls, transported by river and truck to
Linz
Linz ( , ; cs, Linec) is the capital of Upper Austria and third-largest city in Austria. In the north of the country, it is on the Danube south of the Czech border. In 2018, the population was 204,846.
In 2009, it was a European Capital of ...
(on the Danube), and reassembled for use in the
Black Sea
The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Roma ...
against the
Soviet Union
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
.
In contrast to other German submarine types, few Type IIs were lost. This 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 survive; the prototype
CV-707, renamed ''Vesikko'' by the
Finnish Navy
The Finnish Navy ( fi, Merivoimat, sv, Marinen) is one of the branches of the Finnish Defence Forces. The navy employs 2,300 people and about 4,300 conscripts are trained each year. Finnish Navy vessels are given the ship prefix "FNS", short for ...
which later bought it.
On 3 February 2008, ''
The Telegraph
''The Telegraph'', ''Daily Telegraph'', ''Sunday Telegraph'' and other variant names are popular names for newspapers. Newspapers with these titles include:
Australia
* ''The Telegraph'' (Adelaide), a newspaper in Adelaide, South Australia, publ ...
'' reported that ''U-20'' had been discovered by
Selçuk Kolay (a Turkish
marine engineer) in of water off the coast of the Turkish city of
Zonguldak. According to the report, Kolay knows where ''U-23'' and ''U-19'' are, scuttled in deeper water near ''U-20''.
Comparison of Finnish Crichton-Vulcan CV-707(U2A) to German Type II
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 separated net cutters in the bow. The net cutters were adopted from
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
boats but were quickly discontinued during
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
.
Deutsche Werke AG
Deutsche Werke was a German shipbuilding company that was founded in 1925 when Kaiserliche Werft Kiel and other shipyards were merged. It came as a result of the Treaty of Versailles after World War I that forced the German defense industry to shri ...
of
Kiel
Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021).
Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
built six Type IIAs in 1934 and 1935.
List of Type IIA submarines
The prototype, built in Finland:
Finnish submarine ''Vesikko''
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Type IIB
The Type IIB was a lengthened version of the Type IIA. Three additional compartments were inserted amidships which were fitted with additional diesel tanks beneath the control room. The range was increased to 1,800 nautical miles at 12 knots. Diving time was also improved to 30 seconds.
Deutsche Werke AG
Deutsche Werke was a German shipbuilding company that was founded in 1925 when Kaiserliche Werft Kiel and other shipyards were merged. It came as a result of the Treaty of Versailles after World War I that forced the German defense industry to shri ...
of
Kiel
Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021).
Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
built four Type IIBs in 1935 and 1936;
Germaniawerft of
Kiel
Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021).
Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
built fourteen in 1935 and 1936; and
Flender Werke AG
Flender Werke was a German shipbuilding company, located in Lübeck. It was founded in 1917 as a branch of Brückenbau Flender AG of Benrath on the Rhine. In 1926 it was made a fully independent business and renamed Lübecker Flenderwerke AG. It ...
of
Lübeck built two between 1938 and 1940. In total, twenty were built.
List of Type IIB submarines
There were 20 Type IIB submarines commissioned.
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Type IIC
The Type IIC was a further lengthened version of the Type IIB with an additional two compartments inserted amidships to accommodate improved radio room facilities. The additional diesel tanks beneath the control room were further enlarged, extending the range to 1,900 nautical miles at 12 knots.
Deutsche Werke AG
Deutsche Werke was a German shipbuilding company that was founded in 1925 when Kaiserliche Werft Kiel and other shipyards were merged. It came as a result of the Treaty of Versailles after World War I that forced the German defense industry to shri ...
of
Kiel
Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021).
Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
built eight Type IICs between 1937 and 1940.
List of Type IIC submarines
There were eight Type IIC submarines commissioned.
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Type IID
The Type IID had additional saddle tanks fitted to the sides of the external hull. These saddle tanks were used to accommodate additional diesel storage tanks. The diesel oil would float atop the saddle tanks. As oil was consumed, water would gradually fill the tanks to compensate for the positive buoyancy. The range was nearly doubled to at and enabled the Type II to conduct longer operations around the
British Isles
The British Isles are a group of islands in the North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner and Outer Hebrides, the Northern Isles, ...
. A further development was the propellers were fitted with
Kort nozzle
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited di ...
s, intended to improve propulsion efficiency.
Deutsche Werke AG
Deutsche Werke was a German shipbuilding company that was founded in 1925 when Kaiserliche Werft Kiel and other shipyards were merged. It came as a result of the Treaty of Versailles after World War I that forced the German defense industry to shri ...
of
Kiel
Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021).
Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
built sixteen Type IIDs in 1939 and 1940.
List of Type IID submarines
There were 16 Type IID submarines commissioned.
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Ships in class
See
list of German Type II submarines
The list of German Type II submarines includes all German Type II submarine, Type II submarines (''Unterseeboot'' or U-boat) built by Germany.
Type IIA
German submarine U-1 (1935), ''U 1''
* Builder: Deutsche Werke AG at Kiel
* Laid down: 1 ...
for individual ship details.
See also
*
Type VII patrol submarine.
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Type IX oceanic submarine.
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List of naval ship classes of Germany
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List of World War II ship classes
The List of ship classes of World War II is an alphabetical list of all ship classes that served in World War II. Only actual classes are included as opposed to unique ships (which are still included if they were the only one of a class to be buil ...
*
Ingenieurskantoor voor Scheepsbouw
NV Ingenieurskantoor voor Scheepsbouw (''Dutch: engineer-office for shipbuilding''), usually contracted to IvS, was a Dutch dummy company set up in The Hague and funded by the ''Reichsmarine'' after World War I in order to maintain and develop Ge ...
References
Bibliography
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External links
Dutch Export Submarines - Ingenieurskantoor voor Scheepsbouw
Type II U-Boat at Uboataces.com
{{DEFAULTSORT:Type 002 submarine
Submarine classes
World War II submarines of Germany