SM UC-31

History

German Empire
Name:	UC-31
Ordered:	29 August 1915
Builder:	AG Vulcan, Hamburg
Yard number:	70
Launched:	7 August 1916
Commissioned:	2 September 1916
Fate:	surrendered, November 1918; broken up, 1922
General characteristics
Class and type:	German Type UC II submarine
Displacement:	400 t (390 long tons), surfaced 480 t (470 long tons), submerged
Length:	49.45 m (162 ft 3 in) o/a 39.30 m (128 ft 11 in) pressure hull
Beam:	5.22 m (17 ft 2 in) o/a 3.65 m (12 ft) pressure hull
Draught:	3.68 m (12 ft 1 in)
Propulsion:	2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 500 PS (370 kW; 490 bhp) 2 × electric motors, 460 PS (340 kW; 450 shp)
Speed:	11.6 knots (21.5 km/h; 13.3 mph), surfaced 6.7 knots (12.4 km/h; 7.7 mph), submerged
Range:	10,040 nmi (18,590 km; 11,550 mi) at 7 knots (13 km/h; 8.1 mph), surfaced 53 nmi (98 km; 61 mi) at 4 knots (7.4 km/h; 4.6 mph), submerged
Test depth:	50 m (160 ft)
Complement:	26
Armament:	6 × 100 cm (39.4 in) mine tubes 18 × UC 200 mines 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern) 7 × torpedoes 1 × 8.8 cm (3.46 in) Uk L/30 deck gun
Notes:	48-second diving time
Service record
Part of:	I Flotilla 10 December 1916 – 14 June 1918 Flandern II Flotilla 14 June – 7 October 1918 I Flotilla 7 October – 11 November 1918
Commanders:	Kptlt. Otto von Schrader 2 September 1916 – 20 July 1917 Kptlt. Kurt Siewert 21 July 1917 – 14 June 1918 Oblt.z.S. Willy Stüben 15 June – 11 November 1918
Operations:	13 patrols
Victories:	35 merchant ships sunk (50,258 GRT) 3 merchant ships damaged (8,016 GRT) 3 warships sunk (759 tons) 1 warship damaged (1,025 tons)

SM UC-31 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 29 August 1915 and was launched on 7 August 1916. She was commissioned into the German Imperial Navy on 2 September 1916 as SM UC-31. In 13 patrols UC-31 was credited with sinking 38 ships, either by torpedo or by mines laid. UC-31 was surrendered on 26 November 1918 and broken up at Canning Town in 1922.

A German Type UC II submarine, UC-31 had a displacement of 400 tonnes (390 long tons) when at the surface and 480 tonnes (470 long tons) while submerged. She had a length overall of 49.45 m (162 ft 3 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.68 m (12 ft 1 in). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 250 metric horsepower (180 kW; 250 shp) (a total of 500 metric horsepower (370 kW; 490 shp)), two electric motors producing 460 metric horsepower (340 kW; 450 shp), and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of 50 metres (160 ft).

The submarine had a maximum surface speed of 11.6 knots (21.5 km/h; 13.3 mph) and a submerged speed of 6.7 knots (12.4 km/h; 7.7 mph). When submerged, she could operate for 53 nautical miles (98 km; 61 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 10,040 nautical miles (18,590 km; 11,550 mi) at 7 knots (13 km/h; 8.1 mph). UC-31 was fitted with six 100 centimetres (39 in) mine tubes, eighteen UC 200 mines, three 50 centimetres (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8 centimetres (3.5 in) Uk L/30 deck gun. Her complement was twenty-six crew members.

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