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, 26 November 1918; broken up, 1922
General characteristics
Class & type	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 (3.5 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:	Oblt.z.S. / 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 auxiliary warships sunk ; (759 GRT); 3 merchant ships damaged ; (8,016 GRT); 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.

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, 26 November 1918; broken up, 1922
General characteristics
Class & type	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 (3.5 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:	Oblt.z.S. / 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 auxiliary warships sunk (759 GRT) 3 merchant ships damaged (8,016 GRT) 1 warship damaged (1,025 tons)