Design and Construction
U-4 was built as part of a plan by the Austro-Hungarian Navy to competitively evaluate foreign submarine designs from Simon Lake, Germaniawerft, and John Philip Holland. The Austro-Hungarian Navy authorized the construction of U-4 (and sister ship, U-3) in 1906 by Germaniawerft of Kiel, Germany. U-4 was laid down on 12 March 1907 and launched on 20 November 1908. After completion, she was towed via Gibraltar to Pola, where she arrived on 19 April 1909.
U-4's design was an improved version of Germaniawerft's design for the Imperial German Navy's first U-boat, U-1, and featured a double hull with internal saddle tanks. The Germaniawerft engineers refined the design's hull shape through extensive model trials.
U-4 was 138 feet 9 inches (42 m) long by 14 feet (4.3 m) abeam and had a draft of 12 feet 6 inches (3.81 m). She displaced 240 tonnes (260 short tons) surfaced and 300 tonnes (330 short tons) submerged. She was armed with two bow 45-centimeter (17.7 in) torpedo tubes, and was designed to carry up to three torpedoes.
Read more about this topic: SM U-4 (Austria-Hungary)
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