SM U-138

History
German Empire
Name	U-138
Ordered	27 May 1916
Builder	Kaiserliche Werft Danzig
Launched	12 January 1917
Commissioned	26 March 1918
Fate	Unknown
General characteristics
Class and type	German Type Large MS 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, 3,400 bhp (2,500 kW) total; 2 × diesel generators for surface dash, 890 brake horsepower (660 kW) total; 2 × electric motors, 1,670 shp (1,240 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) SK L/45 deck gun with 220 rounds; 1 × 8.8 cm (3.5 in) SK L/30 deck gun;
Service record
Operations:	None
Victories:	None

SM U-138^{[Note 1]} 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. ^[2]

References

^ "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.

^ Gröner 1991, pp. 15–16.
^ Helgason, Guðmundur. "WWI U-boats: U 138". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 January 2010.

Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

v t e German Type U 127 submarines
U-127 U-128 U-129 U-130 U-131 U-132 U-133 U-134 U-135 U-136 U-137 U-138
Preceded by: Type UE II Followed by: Type Large MS
List of U-boats of Germany

History

German Empire
Name	U-138
Ordered	27 May 1916
Builder	Kaiserliche Werft Danzig
Launched	12 January 1917
Commissioned	26 March 1918
Fate	Unknown
General characteristics ^[1]
Class and type	German Type Large MS 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, 3,400 bhp (2,500 kW) total 2 × diesel generators for surface dash, 890 brake horsepower (660 kW) total 2 × electric motors, 1,670 shp (1,240 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) SK L/45 deck gun with 220 rounds 1 × 8.8 cm (3.5 in) SK L/30 deck gun
Service record
Operations:	None
Victories:	None