SM U-2 (Austria-Hungary)

A view of U-2 showing her conning tower, two periscopes, and a ventilation mast (far left)
History
Austria-Hungary
Name:	SM U-2
Ordered:	24 November 1906
Builder:	Pola Navy Yard, Pola
Laid down:	18 July 1907
Launched:	3 April 1909
Commissioned:	22 June 1911
Refit:	January – June 1915
Fate:	Ceded to Italy in 1920; scrapped
Service record
Commanders:	Klemens Ritter von Bezard (June 1911 – May 1912) Karl Edler von Unczowski (May 1912 – October 1914) Otto Zeidler (October 1914 – February 1915) Karl Edler von Unczowski (February – June 1915) Otto Kasseroller (June 1915 – September 1917) Johann Ulmansky von Vracsevgaj (September 1917 – March 1918) Othmar Printz (March – September 1918) Johann Ulmansky von Vracsevgaj (September – October 1918)
Victories:	None
General characteristics
Type:	U-1-class submarine
Displacement:	229.7 t surfaced 223.0 t submerged
Length:	100 ft (30 m)
Beam:	15 ft 9 in (4.80 m)
Draft:	12 ft 8 in (3.86 m)
Propulsion:	2 × shafts 2 × gasoline engines, 720 bhp (540 kW) total 2 × electric motors, 200 shp (150 kW) total
Test depth:	40 meters (130 ft)
Complement:	17
Armament:	3 × 45 cm (17.7 in) torpedo tubes (two front, one rear) 5 torpedoes 1 × 37 mm (1.5 in) deck gun
Differences after modernization:
Displacement:	248.9 t surfaced 277.5 t submerged
Length:	100 ft 11 in (30.76 m)
Propulsion:	2 × shafts 2 × diesel engines 2 × electric motors, 200 shp (150 kW) total
Speed:	10.3 knots (19.1 km/h) surfaced 6 knots (11 km/h) submerged
Range:	950 nmi (1,760 km) at 6 knots (11 km/h), surfaced 40 nmi (74 km) at 2 knots (3.7 km/h), submerged

SM U-2 or U-II was a U-1-class submarine or U-boat built for and operated by the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine). U-2 was designed by American Simon Lake's Lake Torpedo Boat Company and built at the navy yard in Pola. She was one of two Lake-designed submarines purchased as part of a competitive evaluation of three foreign submarine designs.

U-2 was launched in April 1909 and was 100 feet (30 m) long and displaced almost 230 tonnes (250 short tons) surfaced and just under 249 tonnes (274 short tons) when submerged. The Austro-Hungarian Navy conducted trials for U-2 through 1910. The U-boat was originally powered by two gasoline engines for surface running, and two electric motors when submerged, but during her evaluation period, the gasoline engines were found to be incapable of reaching the contracted speed. U-2 was commissioned in June 1911 and served as a training boat for the Austro-Hungarian Navy through 1914.

At the beginning of World War I, U-2 was not operational because she was in drydock awaiting replacement diesel engines. With her new engines and a new conning tower installed by June 1915, U-2 conducted reconnaissance cruises out of Trieste but was declared obsolete in early 1918. U-2 remained in service as a training boat at the submarine base on Brioni, but was at Pola at the end of the war. She was ceded to Italy as a war reparation in 1920 and scrapped at Pola. U-2 did not sink any ships during the war.