SM U-166

SM U-166 was one of the 329 submarines serving in the Imperial German Navy. She was a Type Mittel U submarine, launched in 1918. She would have been engaged in naval warfare and taken part in the First Battle of the Atlantic, but it was not commissioned until the end of the war. She surrendered on 21 March 1919 and became the French submarine Jean Roulier until 24 July 1935. U-166 was broken up.

Design

Type U 93 submarines were preceded by the shorter Type U 87 submarines. U-166 had a displacement of when at the surface and while submerged. She had a total length of, a pressure hull length of, a beam of, a height of, and a draught of. The submarine was powered by two engines for use while surfaced, and two engines for use while submerged. She had two propeller shafts and two propellers. She was capable of operating at depths of up to.
The submarine had a maximum surface speed of and a maximum submerged speed of. When submerged, she could operate for at ; when surfaced, she could travel at. U-166 was fitted with six torpedo tubes, twelve to sixteen torpedoes, and one SK L/45 deck gun. She had a complement of thirty-six.