SM U-46

History
German Empire
Name	U-46
Ordered	4 August 1914
Builder	Kaiserliche Werft, Danzig
Yard number	24
Launched	18 May 1915
Commissioned	17 December 1915
Fate	Surrendered to Japan 26 November 1918
Japanese Empire
Name	O-2
Acquired	26 November 1918
Commissioned	1920
Decommissioned	1921
Fate	Possibly scrapped 1922; Possibly foundered on 21 April 1925 or Scuttled on or after 5 August 1927
General characteristics [1]
Class and type	Type U-43 submarine
Displacement	725 t (714 long tons) surfaced 940 t (930 long tons) submerged
Length	65.00 m (213 ft 3 in) (o/a)
Beam	6.20 m (20 ft 4 in) (oa) 4.18 m (13 ft 9 in) (pressure hull)
Height	9.00 m (29 ft 6 in)
Draught	3.74 m (12 ft 3 in)
Installed power	2 × 2,000 PS (1,471 kW; 1,973 shp) surfaced 2 × 1,200 PS (883 kW; 1,184 shp) submerged
Propulsion	2 shafts
Speed	15.2 knots (28.2 km/h; 17.5 mph) surfaced 9.7 knots (18.0 km/h; 11.2 mph) submerged
Range	11,400 nmi (21,100 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 51 nmi (94 km; 59 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth	50 m (164 ft 1 in)
Complement	36
Armament	4 × 50 cm (19.7 in) torpedo tubes (two bow, two stern) 6 torpedoes 1 × 8.8 cm (3.5 in) SK L/30 deck gun
Service record[2]
Part of:	III Flotilla 29 March 1916 – 11 November 1918
Commanders:	Kptlt. Leo Hillebrand 17 December 1915 - 6 December 1917 Kptlt. Alfred Saalwächter 7 December 1916 – 15 January 1917 Kptlt. Leo Hillebrand 16 January – 11 November 1918
Operations:	11 patrols
Victories:	51 merchant ships sunk (138,942 GRT) 1 auxiliary warship sunk (1,372 GRT) 1 merchant ship damaged (7,378 GRT)

SM U-46 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-46 was engaged in the combat during World War I and took part in the First Battle of the Atlantic. After the war, she served in the Imperial Japanese Navy as O-2.