German submarine U-641

German submarine U-641 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 19 November 1941 by Blohm & Voss, Hamburg as yard number 617, launched on 6 August 1942 and commissioned on 24 September 1942 under Oberleutnant zur See Horst Rendtel.

History
Nazi Germany
Name	U-641
Ordered	20 January 1941
Builder	Blohm & Voss, Hamburg
Yard number	617
Laid down	19 November 1941
Launched	6 August 1942
Commissioned	24 September 1942
Fate	Sunk on 19 January 1944
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
Height	9.60 m (31 ft 6 in)
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 (4 bow, 1 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[1]
Part of:	5th U-boat Flotilla 24 September 1942 – 28 February 1943 7th U-boat Flotilla 1 March 1943 – 19 January 1944
Identification codes:	M 50 387
Commanders:	Oblt.z.S. / Kptlt. Horst Rendtel[2] 24 September 1942 – 19 January 1944
Operations:	4 patrols: 1st patrol: 20 February – 12 April 1943 2nd patrol: 9 May – 16 July 1943 3rd patrol: a. 31 August – 1 September 1943 b. 4 September – 18 October 1943 4th patrol: 11 December 1943 – 19 January 1944
Victories:	None

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-641 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.^[3] She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two BBC GG UB 720/8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).^[3]

The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph).^[3] When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-641 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and one twin 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.^[3]

Service history

The boat's short service career began on 24 September 1942 for training with 5th U-boat Flotilla, followed by active service on 1 March 1943 as part of the 7th U-boat Flotilla. It ended ten months later when she was sunk in the North Atlantic.

In four patrols she sank no ships.

Wolfpacks

U-641 took part in thirteen wolfpacks, namely:

• Neuland (4 – 6 March 1943)
• Ostmark (6 – 11 March 1943)
• Stürmer (11 – 20 March 1943)
• Seewolf (21 – 30 March 1943)
• Mosel (19 – 24 May 1943)
• Trutz (1 – 16 June 1943)
• Trutz 2 (16 – 29 June 1943)
• Geier 1 (30 June – 14 July 1943)
• Leuthen (15 – 24 September 1943)
• Rossbach (24 September – 9 October 1943)
• Borkum (18 December 1943 – 3 January 1944)
• Borkum 2 (3 – 13 January 1944)
• Rügen (13 – 19 January 1944)

Fate

U-641 was sunk on 19 January 1944 in the North Atlantic in position 50°25′N 18°49′W; depth charged by Royal Navy corvette HMS Violet. There were no survivors.