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German submarine U-634

Coordinates: 40°13′N 19°24′W / 40.217°N 19.400°W / 40.217; -19.400
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History
Nazi Germany
NameU-634
Ordered15 August 1940
BuilderBlohm & Voss, Hamburg
Yard number610
Laid down23 September 1941
Launched10 June 1942
Commissioned6 August 1942
FateSunk 30 August 1943 in the North Atlantic in position 40°13′N 19°24′W / 40.217°N 19.400°W / 40.217; -19.400, by depth charges from HMS Stork & HMS Stonecrop.
General characteristics
Class and typeType VIIC submarine
Displacement
Length
Beam
  • 6.20 m (20 ft 4 in) o/a
  • 4.70 m (15 ft 5 in) pressure hull
Height9.60 m (31 ft 6 in)
Draught4.74 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
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)
Complement4 officers, 40–56 enlisted
Armament
Service record[1]
Part of:
Identification codes: M 23 270
Commanders:
  • Oblt.z.S. Hans-Günther Brosin
  • 6 August 1942 – 2 February 1943
  • Oblt.z.S. Eberhard Dahlhaus
  • 28 January – 30 August 1943
Operations:
  • 3 patrols:
  • 1st patrol:
  • 18 February – 23 March 1943
  • 2nd patrol:
  • 15 April – 23 May 1943
  • 3rd patrol:
  • 12 June – 30 August 1943
Victories: 1 merchant ship sunk
(7,176 GRT)

German submarine U-634 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 23 September 1941 by Blohm & Voss, Hamburg as yard number 610, launched on 10 June 1942 and commissioned on 6 August 1942 under Oberleutnant zur See Hans-Günther Brosin.

Design

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German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-634 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.[2] 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).[2]

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).[2] 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-634 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.[2]

Service history

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The boat's career began with training at 5th U-boat Flotilla on 6 August 1942, followed by active service on 1 February 1943 as part of the 9th Flotilla for the remainder of her service. In three patrols she sank one merchant ship, for a total of 7,176 gross register tons (GRT).

Fate

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U-634 was sunk on 30 August 1943 in the North Atlantic in position 40°13′N 19°24′W / 40.217°N 19.400°W / 40.217; -19.400, by depth charges from HMS Stork and HMS Stonecrop. All crew members died.

Wolfpacks

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U-634 took part in five wolfpacks, namely:

  • Westmark (6 – 11 March 1943)
  • Amsel (22 April – 3 May 1943)
  • Amsel 2 (3 – 6 May 1943)
  • Elbe (7 – 10 May 1943)
  • Elbe 1 (10 – 14 May 1943)

Summary of raiding history

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Date Ship Name Nationality Tonnage
(GRT)
Fate[3]
2 March 1943 Meriwether Lewis  United States 7,176 Sunk

References

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  1. ^ Helgason, Guðmundur. "The Type VIIC boat U-634". German U-boats of WWII - uboat.net. Retrieved 31 August 2014.
  2. ^ a b c d Gröner 1991, pp. 43–46.
  3. ^ Helgason, Guðmundur. "Ships hit by U-634". German U-boats of WWII - uboat.net. Retrieved 31 August 2014.

Bibliography

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