SM UC-4

SM UC-4 was a German Type UC I minelayer submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) during World War I. The U-boat had been ordered by November 1914 and was launched on 6 June 1915. She was commissioned into the German Imperial Navy on 10 June 1915 as SM UC-4. Mines laid by UC-4 in her 73 patrols were credited with sinking 36 ships. UC-4 was scuttled off the coast of Flanders during the German evacuation on 5 October 1918.

Design
A Type UC I submarine, UC-4 had a displacement of 168 t when at the surface and 183 t while submerged. She had a length overall of 33.99 m, a beam of 3.15 m, and a draught of 3.04 m. The submarine was powered by one Daimler-Motoren-Gesellschaft six-cylinder, four-stroke diesel engine producing 90 PS, an electric motor producing 175 PS, and one propeller shaft. She was capable of operating at a depth of 50 m.

The submarine had a maximum surface speed of 6.20 kn and a maximum submerged speed of 5.22 kn. When submerged, she could operate for 50 nmi at 4 kn; when surfaced, she could travel 780 nmi at 5 kn. UC-4 was fitted with six 100 cm mine tubes, twelve UC 120 mines, and one 8 mm machine gun. She was built by AG Vulcan Stettin and her complement was fourteen crew members.