U-10-class submarine

The Austro-Hungarian Navy's U-boat fleet at the beginning of World War I consisted of six largely experimental submarines, two of which were not operational.Gardiner, p. 341.{{SMU|U-1|Austria-Hungary|2}} and {{SMU|U-2|Austria-Hungary|2}} were in drydock awaiting diesel engines to replace their inadequate gasoline engines. See: Gardiner, pp. 340–41. The Navy did have five {{sclass|U-7|submarine|1}}s under construction in Germany, but a perceived inability to sail the completed submarines past Gibraltar to the naval base at Pola led to a hasty decision to sell them to Germany,In April 1915, some five months after the sale of the U-7 boats, the German U-boat {{SMU|U-21|Germany|2}} successfully sailed into the Mediterranean via Gibraltar, proving that delivery of the U-7 boats to Austria-Hungary would have been possible. See: Gardiner, p. 343. a severe setback for Austria-Hungary's U-boat fleet.

In order to bolster their fleet, which had already been boosted by the recovery and commissioning of the French submarine {{ship|French submarine|Curie|Q 87|2}} as U-14 in 1915, the Austro-Hungarian Navy purchased five German UB-type coastal submarines, which had the advantages of short construction time and the ability to be shipped by rail—which avoided the perceived pitfalls of sea delivery.The performance of the German Type UB I U-boats was well known in Austria because the Imperial German Navy submarines {{SMU|UB-3||2}}, {{SMU|UB-8||2}}, and {{SMU|UB-9||2}} had been shipped from Germany and assembled and launched at Pola. See Gardiner, p. 341. The first contract in February 1915 secured the purchase of {{SMU|U-10|Austria-Hungary|2}} and {{SMU|U-11|Austria-Hungary|2}}, initially commissioned as the German Type UB I U-boats {{SMU|UB-1||2}} and {{SMU|UB-15||2}}, respectively. A further contract on 1 April 1915, purchased three more boats, {{SMU|U-15|Austria-Hungary|2}}, {{SMU|U-16|Austria-Hungary|2}}, and {{SMU|U-17|Austria-Hungary|2}}.

The U-10-class boats were small coastal submarines that displaced {{convert|125.5|LT|t}} surfaced and {{convert|140.25|LT|t}} submerged. For propulsion, they featured a single shaft, a single {{convert|60|bhp|abbr=on}} diesel engine for surface running, and a single {{convert|120|shp|abbr=on}} electric motor for submerged travel. The boats were capable of {{convert|6.5|to|7.5|kn}} while surfaced and {{convert|5.5|to|6.2|kn}} while submerged at a diving depth of up to {{convert|50|m|ft}}. All five had slightly different conning tower configurations, but were all designed for a crew of 17 officers and men.

The lead boat of the class, U-10, was built by Germaniawerft of Kiel, while the other four were constructed by AG Weser of Bremen. All five were transported by rail in sections to the navy yard at Pola, where they only needed riveting together to be complete, a process that typically took about two weeks.Messimer, p. 126–27.

U-10 was the first ship of the class launched, as the German UB-1 on 22 January 1915. The other four boats were launched by April. UB-1 and UB-15 were initially commissioned into the Kaiserliche Marine in January and April, respectively,{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: UB-1 | url = http://uboat.net/wwi/boats/index.html?boat=UB+1 | work = U-Boat War in World War I | access-date = 3 November 2008 }}{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: UB-15 | url = http://uboat.net/wwi/boats/index.html?boat=UB+U15 | work = U-Boat War in World War I | access-date = 3 November 2008 }} each with German commanders and crew, but with an Austro-Hungarian Navy officer for piloting and training purposes, but both were commissioned into the K.u.K. Kriegsmarine with Austro-Hungarian crews by July. The other three ships were never manned by German crews and had all been commissioned by early October when each is listed in sources with a commanding officer.{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: U KUK U15 | url = http://uboat.net/wwi/boats/index.html?boat=KUK+U15 | work = U-Boat War in World War I | access-date = 3 November 2008 }}{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: U KUK U16 | url = http://uboat.net/wwi/boats/index.html?boat=KUK+U16 | work = U-Boat War in World War I | access-date = 3 November 2008 }}{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: U KUK U17 | url = http://uboat.net/wwi/boats/index.html?boat=KUK+U17 | work = U-Boat War in World War I | access-date = 3 November 2008 }}

The U-10-class boats were equipped with two {{convert|45|cm|in|1|abbr=on}} torpedo tubes located in the front and carried a complement of two torpedoes. The German Type UB I submarines were additionally equipped with a {{convert|8|mm|in|2|abbr=on}} machine gun, but it is not clear from sources if U-10 and U-11, the former German boats, were either equipped with them or, if so, retained them in Austro-Hungarian service. In October 1916, all the boats except U-11 received 37 mm/23 (1.5 in) quick-firing (QF) guns. U-11 received a Škoda 7 cm guns/18 gun originally planned for U-14 (which received a larger gun instead). In November 1917, the 37 mm guns were replaced by QF 3-pounder Hotchkiss#Austro-Hungarian service/33 QF guns.

All five boats of the U-10 class took part in the war, but, as a class, had limited success. Although UB-1 and UB-15 had each had sunk a single ship while commissioned in the German Imperial Navy during 1915, neither boat sank any ships in Austro-Hungarian service.{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: U KUK U10 | url = http://uboat.net/wwi/boats/index.html?boat=KUK+U10 | work = U-Boat War in World War I | access-date = 3 November 2008 }}{{cite web | last = Helgason | first = Guðmundur | title = WWI U-boats: U KUK U11 | url = http://uboat.net/wwi/boats/index.html?boat=KUK+U11 | work = U-Boat War in World War I | access-date = 3 November 2008 }} U-17 sunk two ships, the unidentified sailing vessel, which sank on 1 January 1916 and the {{ship|Italian destroyer|Impetuoso|1913|6}}, which sank on 10 July 1916.{{cite web | last = Helgason | first = Guðmundur | title = Ships hit during WWI: Impetuoso | url = http://uboat.net/wwi/ships_hit/2995.html | work = U-Boat War in World War I | access-date = 3 November 2008 }} U-16 sank or captured two small sailing ships in late 1915 and torpedoed and sank the {{ship|Italian destroyer|Nembo|1901|6}} on 16 October 1916.{{cite web | last = Helgason | first = Guðmundur | title = Ships hit during WWI: Nembo | url = http://uboat.net/wwi/ships_hit/4341.html | work = U-Boat War in World War I | access-date = 3 November 2008 }} U-15 was the most successful of the class, sinking six ships for a total of {{GRT|8,044}} and 745 tons. On a single day, 25 June 1916, U-15 sank the Italian auxiliary cruiser {{SS|Citta di Messina||2}} and the {{ship|French destroyer|Fourche}} in the Strait of Otranto,{{cite web | last = Derencin | first = Robert | title = The Central Powers submarines in the Mediterranean during WWI | url = http://www.uboat.net/articles/index.html?article=64 | work = U-Boat War in World War I | access-date = 3 November 2008 }} accounting for almost half of her wartime successes.

Of the five boats, only U-16 was sunk during the war, shortly after sinking Nembo. The only other casualty among the class involved U-10, which hit a mine near Caorle and was beached with heavy damage. Although she was looted by Austro-Hungarian Army troops, she was later towed to Trieste for repairs which remained incomplete at the war's end. After the end of fighting in November 1918, the four surviving class members—U-10, U-11, U-15, and U-17—were all turned over to Italy as war reparations and scrapped at Pola by 1920.

{{main|SM U-10 (Austria-Hungary)}}

SM U-10 was the lead boat of the U-10 class of submarines for the Austro-Hungarian Navy, but was originally named UB-1 as a part of the German Imperial Navy. She was laid down on 1 November 1914 in Germany and shipped by rail to Pola where she was assembled and launched on 22 January 1915. Commissioned one week later as SM UB-1, she sank one Italian torpedo boat in her German service. In July, she was handed over to the Austro-Hungarian Navy and commissioned as SM U-10. She was the target of an unsuccessful torpedo attack by a British submarine in May 1917. In July 1918, U-10 hit a mine and was beached with heavy damage. She was towed to Trieste for repairs which remained unfinished at the war's end. She was handed over to Italy as a war reparation and scrapped in 1920.

{{main|SM U-11 (Austria-Hungary)}}

SM U-11 was also originally a part of the German Imperial Navy, under the name UB-15. She was laid down on 9 November 1914 in Germany and shipped by rail to Pola where she was assembled, launched, and commissioned as SM UB-15 on 11 April 1915. In her only wartime success, she sank an Italian submarine in German service in early June. Shortly thereafter, she was delivered to the Austro-Hungarian Navy and commissioned as SM U-11 on 14 June. In early 1916, U-11 made a torpedo attack on a British submarine but missed. She was delivered to Italy as a war reparation and scrapped in 1920.

{{main|SM U-15 (Austria-Hungary)}}

SM U-15 was constructed in Germany and shipped by rail to Pola where she was assembled and launched in September 1915 and commissioned on 6 October. U-15 was the most successful boat of the U-10 class, sinking six ships totaling {{GRT|8,044}} and 745 tons. She survived the war and was ceded to Italy as a war reparation and scrapped in 1920.

{{main|SM U-16 (Austria-Hungary)}}

SM U-16 was constructed in Germany and shipped by rail to Pola where she was assembled and launched on 26 April 1915 and commissioned on 6 October. U-16 sank one ship in November 1915 and seized another in December. While operating in the Adriatic off the coast of Albania in mid-October 1916, U-16 sank an Italian destroyer acting as a convoy escort. U-16 was sunk in the ensuing action, but sources are not clear on the exact cause of her sinking.

{{main|SM U-17 (Austria-Hungary)}}

SM U-17 was constructed in Germany and shipped by rail to Pola where she was assembled and launched on 21 April 1915 and commissioned on 6 October. U-17 sank an unidentified sailing vessel in January 1916 and sank an Italian destroyer in July 1916 as part of an effort to disrupt the Otranto Barrage. The boat survived the war and was delivered to Italy as a war reparation and scrapped in 1920.

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• {{cite book | editor-last = Gardiner | editor-first = Robert | title = Conway's All the World's Fighting Ships 1906–1921 | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 1985 | isbn = 978-0-87021-907-8 | oclc = 12119866 }}
• {{cite book | last = Messimer | first = Dwight R. | title = Verschollen : World War I U-boat losses | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 2002 | isbn = 978-1-55750-475-3 | oclc = 231973419 }}

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{{U-10 class submarines}}

{{Austro-Hungarian submarine classes}}

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Category:Submarine classes