Design and Construction
The U-10-class boats were small coastal submarines that displaced 125.5 long tons (127.5 t) surfaced and 140.25 long tons (142.50 t) submerged. For propulsion, they featured a single shaft, a single 60 bhp (45 kW) diesel engine for surface running, and a single 120 shp (89 kW) electric motor for submerged travel. The boats were capable of 6.5 to 7.5 knots (12.0 to 13.9 km/h) while surfaced and 5.5 to 6.2 knots (10.2 to 11.5 km/h) while submerged at a diving depth of up to 50 metres (160 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 Pola, where they only needed riveting together to be complete, a process that typically took about two weeks.
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, 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.
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