SM U-23 (Austria-Hungary)
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SM ''U-23'' or ''U-XXIII'' was a or U-boat built for and operated by the
Austro-Hungarian Navy The Austro-Hungarian Navy or Imperial and Royal War Navy (german: kaiserliche und königliche Kriegsmarine, in short ''k.u.k. Kriegsmarine'', hu, Császári és Királyi Haditengerészet) was the naval force of Austria-Hungary. Ships of the A ...
(german: Kaiserliche und Königliche Kriegsmarine or ) during the First World War. The design for ''U-23'' was based on that of the submarines of the Royal Danish Navy's ''Havmanden'' class (which had been designed by Whitehead & Co. in
Fiume Rijeka ( , , ; also known as Fiume hu, Fiume, it, Fiume ; local Chakavian: ''Reka''; german: Sankt Veit am Flaum; sl, Reka) is the principal seaport and the third-largest city in Croatia (after Zagreb and Split). It is located in Primor ...
), and was largely obsolete by the beginning of the war. ''U-23'' was just over long and was armed with two bow torpedo tubes, a deck gun, and a machine gun. In February 1918, ''U-23'' was sunk with all hands by the Italian torpedo boat ''Airone'' while attempting an attack on the Italian transport . ''U-23'' had no wartime successes.


Design and construction

When it became apparent to the
Austro-Hungarian Navy The Austro-Hungarian Navy or Imperial and Royal War Navy (german: kaiserliche und königliche Kriegsmarine, in short ''k.u.k. Kriegsmarine'', hu, Császári és Királyi Haditengerészet) was the naval force of Austria-Hungary. Ships of the A ...
that the First World War would not be a short one,Halpern, p. 382. they moved to bolster their U-boat fleet by seizing the plans for the Danish ''Havmanden'' class submarines, which had been designed by Whitehead & Co. in
Fiume Rijeka ( , , ; also known as Fiume hu, Fiume, it, Fiume ; local Chakavian: ''Reka''; german: Sankt Veit am Flaum; sl, Reka) is the principal seaport and the third-largest city in Croatia (after Zagreb and Split). It is located in Primor ...
, who had built three units. Although the Austro-Hungarian Navy was not happy with the design, which was largely obsolete,Gardiner, p. 341. it was the only design for which plans were available and which could be begun immediately in domestic shipyards. The Austro-Hungarian Navy unenthusiastically placed orders for ''U-23'' and her three sister boats on 27 March 1915. ''U-23'' was one of two boats of the class to be built at the Hungarian UBAG yard in Fiume. Due to demands by the Hungarian government, subcontracts for the class were divided between Hungarian and Austrian firms, and this politically expedient solution worsened technical problems with the design, resulting in numerous modifications and delays for the class in general. ''U-23'' was an ocean-going submarine that displaced surfaced and submerged and was designed for a complement of 18. She was long with a
beam Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...
of and a draft of . For propulsion, she featured a single shaft, a single diesel engine for surface running, and a single electric motor for submerged travel. She was capable of while surfaced and while submerged. Although there is no specific notation of a range for ''U-23'', the ''Havmanden'' class, upon which the ''U-20'' class was based, had a range of at , surfaced, and at submerged. ''U-23'' was armed with two torpedo tubes located in the front and carried a complement of two torpedoes. She was also equipped with a /26 deck gun and an machine gun.


Service career

''U-23'' was launched on 5 January 1917, but It is not known with certainty when ''U-23'' was commissioned. Author Paul Halpern reports that ''U-23'' and her three sisters all entered service between August and November 1917. Although there are no specific reports of problems with ''U-23'', the ''U-20'' class as a whole suffered from unreliable engines which compounded the poor handling characteristics of the boats. On 21 February 1918,Grant, p. 163. ''
Linienschiffsleutnant is a German language variant of the naval officer rank ship-of-the-line lieutenant. The rank is used by the Belgian Navy and formerly the Austro-Hungarian Navy. Austro-Hungary (; hu, Sorhajóhadnagy) was an officer rank in the Austro-Hu ...
''
Klemens Ritter von Bezard Klemens is a masculine given name derived from Clemens. It may refer to the following people: * Klemens of Brzeźnica (died 1241), Polish nobleman, Voivode of Opole and Castellan of Kraków * Klemens Janicki (1516–1543), Polish poet * Klemens ...
, ''U-23''s only commanding officer, was guiding the boat in an attack on the Italian transport in the
Straits of Otranto The Strait of Otranto ( sq, Ngushtica e Otrantos; it, Canale d'Otranto; hr, Otrantska Vrata) connects the Adriatic Sea with the Ionian Sea and separates Italy from Albania. Its width at Punta Palascìa, east of Salento is less than . The st ...
. ''U-23'' came under attack by the Italian torpedo boat ''Airone'' which first tried to ram the U-boat, and then deployed an explosive paravane. When the paravane contacted the submerged ''U-23'', it exploded, blowing debris into the air and sinking the submarine with all hands. Like all of her sister boats, ''U-23'' had no wartime successes.


References


Bibliography

* * * * {{DEFAULTSORT:U-0023 1917 ships Maritime incidents in 1918 U-20-class submarines U-boats commissioned in 1917 U-boats sunk in 1918 U-boats sunk by Italian warships Ships built in Fiume Ships lost with all hands World War I shipwrecks in the Adriatic Sea World War I submarines of Austria-Hungary