SM U-138

For other ships with the same name, see German submarine U-138.

History
German Empire
Name:	U-138
Ordered:	27 May 1916
Builder:	Kaiserliche Werft Danzig
Launched:	12 January 1917
Commissioned:	26 March 1918
General characteristics
Class & type:	German Type U 127 submarine
Displacement:	1,175 t (1,156 long tons) surfaced 1,534 t (1,510 long tons) submerged
Length:	83.50 m (273 ft 11 in) o/a 65.75 m (215 ft 9 in) pressure hull
Beam:	7.54 m (24 ft 9 in) o/a 4.85 m (15 ft 11 in) pressure hull
Height:	9.46 m (31 ft)
Draught:	4.26 m (14 ft)
Installed power:	2 × MAN diesel engines, total 2 × diesel generators for surface dash, total 2 × electric motors, 1,667 shp (1,243 kW) total
Propulsion:	2 × propeller shafts
Speed:	17 knots (31 km/h; 20 mph) surfaced 9.1 knots (16.9 km/h; 10.5 mph) submerged
Range:	10,000 nmi (19,000 km; 12,000 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 50 nmi (93 km; 58 mi) at 4.5 knots (8.3 km/h; 5.2 mph) submerged
Test depth:	75 m (246 ft)
Complement:	44 men
Armament:	6 × torpedo tubes (4 bow, 2 stern) 16 × torpedoes 1 × 15 cm (5.9 in) deck gun with 220 rounds 1 × 8.8 cm (3.5 in) deck gun

SM U-138 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-138 was engaged in the naval warfare and took part in the First Battle of the Atlantic.