German submarine U-631

History
Nazi Germany
Name	U-631
Ordered	15 August 1940
Builder	Blohm & Voss, Hamburg
Yard number	607
Laid down	5 September 1941
Launched	27 May 1942
Commissioned	16 July 1942
Fate	Sunk on 17 October 1943 in the North Atlantic in position 58°13′N 32°29′W / 58.217°N 32.483°W, by depth charges from HMS Sunflower.
General characteristics
Class & type	Type VIIC submarine
Displacement	769 tonnes (757 long tons) surfaced; 871 t (857 long tons) submerged;
Length	67.10 m (220 ft 2 in) o/a; 50.50 m (165 ft 8 in) pressure hull;
Beam	6.20 m (20 ft 4 in) o/a; 4.70 m (15 ft 5 in) pressure hull;
Draught	4.74 m (15 ft 7 in)
Installed power	2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels); 750 PS (550 kW; 740 shp) (electric);
Propulsion	2 shafts; 2 × diesel engines; 2 × electric motors;
Speed	17.7 knots (32.8 km/h; 20.4 mph) surfaced; 7.6 knots (14.1 km/h; 8.7 mph) submerged;
Range	8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced; 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	230 m (750 ft); Crush depth: 250–295 m (820–968 ft);
Complement	4 officers, 40–56 enlisted
Armament	5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern); 14 × torpedoes or 26 TMA mines; 1 × 8.8 cm (3.46 in) deck gun (220 rounds); 1 × twin 2 cm (0.79 in) C/30 anti-aircraft gun;
Service record
Part of:	5th U-boat Flotilla; 16 July – 31 December 1942; 9th U-boat Flotilla; 1 January – 17 October 1943;
Identification codes:	M 22 458
Commanders:	Oblt.z.S. Jürgen Krüger; 16 July 1942 – 17 October 1943;
Operations:	3 patrols:; 1st patrol:; 19 December 1942 – 4 February 1943; 2nd patrol:; 6 March – 11 May 1943; 3rd patrol:; 18 September – 17 October 1943;
Victories:	2 merchant ships sunk ; (9,136 GRT)

German submarine U-631 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 5 September 1941 by Blohm & Voss, Hamburg as yard number 607, launched on 27 May 1942 and commissioned on 16 July 1942 under Oberleutnant zur See Jürgen Krüger.

History

Nazi Germany
Name	U-631
Ordered	15 August 1940
Builder	Blohm & Voss, Hamburg
Yard number	607
Laid down	5 September 1941
Launched	27 May 1942
Commissioned	16 July 1942
Fate	Sunk on 17 October 1943 in the North Atlantic in position 58°13′N 32°29′W / 58.217°N 32.483°W / 58.217; -32.483, by depth charges from HMS Sunflower.
General characteristics
Class & type	Type VIIC submarine
Displacement	769 tonnes (757 long tons) surfaced 871 t (857 long tons) submerged
Length	67.10 m (220 ft 2 in) o/a 50.50 m (165 ft 8 in) pressure hull
Beam	6.20 m (20 ft 4 in) o/a 4.70 m (15 ft 5 in) pressure hull
Draught	4.74 m (15 ft 7 in)
Installed power	2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels) 750 PS (550 kW; 740 shp) (electric)
Propulsion	2 shafts 2 × diesel engines 2 × electric motors
Speed	17.7 knots (32.8 km/h; 20.4 mph) surfaced 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range	8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	230 m (750 ft) Crush depth: 250–295 m (820–968 ft)
Complement	4 officers, 40–56 enlisted
Armament	5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern) 14 × torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun (220 rounds) 1 × twin 2 cm (0.79 in) C/30 anti-aircraft gun
Service record
Part of:	5th U-boat Flotilla 16 July – 31 December 1942 9th U-boat Flotilla 1 January – 17 October 1943
Identification codes:	M 22 458
Commanders:	Oblt.z.S. Jürgen Krüger 16 July 1942 – 17 October 1943
Operations:	3 patrols: 1st patrol: 19 December 1942 – 4 February 1943 2nd patrol: 6 March – 11 May 1943 3rd patrol: 18 September – 17 October 1943
Victories:	2 merchant ships sunk (9,136 GRT)