SM U-99

SM U-99 was one of the 329 submarines serving in the Imperial German Navy in World War I.

U-99 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

Design
U-99 had a displacement of 750 t when at the surface and 952 t while submerged. She had a total length of 67.60 m, a pressure hull length of 54.02 m, a beam of 6.32 m, a height of 8.25 m, and a draught of 3.65 m. The submarine was powered by two 2400 PS engines for use while surfaced, and two 1200 PS engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 m.

The submarine had a maximum surface speed of 16.5 kn and a maximum submerged speed of 8.8 kn. When submerged, she could operate for 45 nmi at 5 kn; when surfaced, she could travel 10100 nmi at 8 kn. U-99 was fitted with six 50 cm torpedo tubes (four at the bow and two at the stern), twelve to sixteen torpedoes, and one 10.5 cm SK L/45 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).

Operations
The Royal Navy submarine HMS J2 is credited with sinking U-99 in the Northern North Sea on 7 July 1917, although the attribution is uncertain.