German submarine U-751

Last updated
Bundesarchiv Bild 101II-MW-6434-27, St. Nazaire, U-Boot einlaufend.jpg
In port at St. Nazaire on 15 June 1942
History
War ensign of Germany (1938-1945).svg Nazi Germany
NameU-751
Ordered9 October 1939 [1]
Builder Kriegsmarinewerft Wilhelmshaven
Yard number134
Laid down2 January 1940 [1]
Launched16 November 1940 [1]
Commissioned31 January 1941 [1]
FateSunk on 17 July 1942 [1]
General characteristics
Class and type Type 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
Part of:
Identification codes: M 30 807
Commanders:
Operations:
  • 7 patrols: [1]
  • 1st patrol:
  • 3 June – 5 July 1941
  • 2nd patrol:
  • 2 August – 8 September 1941
  • 3rd patrol:
  • 11 October – 8 November 1941
  • 4th patrol:
  • 16 – 26 December 1941
  • 5th patrol:
  • 14 January – 23 February 1942
  • 6th patrol:
  • 15 April – 15 June 1942
  • 7th patrol:
  • 14 – 17 July 1942
Victories:
  • 5 merchant ships sunk
    (21,412  GRT) [1]
  • 1 warship sunk
    (11,000 tons)
  • 1 merchant ship damaged
    (8,096  GRT)

German submarine U-751 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. Built as yard number 134 of the Kriegsmarinewerft shipyard in Wilhelmshaven, she was commissioned on 31 January 1941. She served with 7th U-boat Flotilla until 1 June as a training boat, and as an operational boat until 17 July 1942, under the command of Kapitänleutnant Gerhard Bigalk. U-751 served in seven patrols with the 7th U-boat Flotilla, sinking the escort carrier HMS Audacity. The U-boat was attacked with depth charges from aircraft on 17 July 1942 and sank with the loss of all 48 crew members.

Contents

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-751 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 Brown, Boveri & Cie 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-751 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 a 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty. [2]

Service history

On 14 June 1941, eleven days into her thirty-three-day first patrol while en route from Kiel to St. Nazaire, U-751 attacked and sank the British ship St Lindsay (5,370  gross register tons  (GRT)).

Arriving at St. Nazaire on 5 July, U-751 stayed in port for thirty-four days before going on her second patrol. She attacked no ships on her second and third voyages.

Five days into her fourth patrol, on 21 December 1941, U-751 attacked and sank HMS Audacity, an escort carrier attached with British convoy HG 76. [3]

On 14 January 1942, U-751 left St. Nazaire on her fifth patrol, destined to return on 23 February. Nineteen days into this patrol, on February 2, U-751 attacked and damaged the Dutch ship Corilla, part of convoy HX 173 (8,096 GRT). Two days later, she sank the British ship Silveray, adding another 4,535 GRT to her score. Another British ship, Empire Sun, was sunk another three days later, for 6,952 GRT. The American ships Nicarao and Isabela were sunk in her sixth patrol, on 16 and 19 May 1942, totalling 1,455 and 3,110 GRTs respectively.

Wolfpacks

U-751 took part in six wolfpacks, namely:

Fate

U-751 disabled, unable to dive and circling, apparently out of control following an attack on 17 July 1942. Royal Air Force 1939-1945- Coastal Command C3143.jpg
U-751 disabled, unable to dive and circling, apparently out of control following an attack on 17 July 1942.

After serving six operational patrols, U-751 was attacked on her seventh patrol four days into her voyage on 17 July 1942. After an initial attack by a Armstrong Whitworth Whitley bomber (of No. 502 Squadron RAF) had disabled her, she was attacked by a second aircraft, an Avro Lancaster bomber (of No. 61 Squadron RAF) seconded to Coastal Command. Both aircraft took photographs of U-751 on the surface, reporting men and lifeboats in the water. She was sunk by depth charges from the Lancaster, with all hands lost, in the Atlantic around 200 miles north-west of Cape Ortegal, Spain. [4] [5] [lower-alpha 1]

Summary of raiding history

Ships sunk [Note 1]
DateShipFlagGRT/
disp		Fate [6]
14 June 1941 St. Lindsay Civil Ensign of the United Kingdom.svg  United Kingdom 5,370Sunk
21 December 1941 HMS Audacity Naval Ensign of the United Kingdom.svg  Royal Navy 11,000Sunk
2 February 1942 Corilla Flag of the Netherlands.svg  Netherlands 8,096Damaged
4 February 1942 Silveray Civil Ensign of the United Kingdom.svg  United Kingdom 4,535Sunk
7 February 1942 Empire Sun Civil Ensign of the United Kingdom.svg  United Kingdom 6,952Sunk
16 May 1942 Nicarao Flag of the United States (1912-1959).svg  United States 1,445Sunk
19 May 1942 Isabela Flag of the United States (1912-1959).svg  United States 3,110Sunk

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References

Notes

  1. ↑ Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.
  1. ↑ different sources identify the exact location as either the Bay of Biscay, or just into the Atlantic Ocean itself

Citations

  1. 1 2 3 4 5 6 7 Helgason, Guðmundur. "The Type VIIC boat U-751". German U-boats of WWII - uboat.net. Retrieved 13 October 2009.
  2. 1 2 3 4 Gröner 1991, pp. 43–46.
  3. ↑ Helgason, Guðmundur. "Patrol of German U-boat U-751 from 16 Dec 1941 to 26 Dec 1941". German U-boats of WWII - uboat.net. Retrieved 29 December 2014.
  4. ↑ "U-boat U-751". Imperial War Museum. Retrieved 22 October 2024.
  5. ↑ "U-751". uboat.net. Retrieved 22 October 2024.
  6. ↑ Helgason, Guðmundur. "Ships hit by U-751". German U-boats of WWII - uboat.net. Retrieved 10 February 2014.

Bibliography

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