History
Nazi Germany
Name: U-678
Ordered: 5 June 1941
Builder: Howaldtswerke, Hamburg
Yard number: 827
Laid down: 3 September 1942
Launched: 18 September 1943
Commissioned: 25 October 1943
Fate: Sunk 7 July 1944 in the English Channel in position 50°32′N 00°23′W / 50.533°N 0.383°W / 50.533; -0.383Coordinates: 50°32′N 00°23′W / 50.533°N 0.383°W / 50.533; -0.383, by depth charges from HMCS Ottawa, HMCS Kootenay and HMS Statice.
General characteristics
Class and type: Type VIIC submarine
Displacement:
  • 769 tonnes (757 long tons) surfaced
  • 871 t (857 long tons) submerged
Length:
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:
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:
Service record[1]
Part of:
Commanders:
  • Oblt.z.S. Guido Hyronimus
  • 25 October 1943 – 7 July 1944
Operations: 8 June - 6 July 1944
Victories: None

German submarine U-678 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 3 September 1942 by Howaldtswerke, Hamburg as yard number 827, launched on 18 September 1943 and commissioned on 25 October 1943 under Oberleutnant zur See Guido Hyronimus.

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-678 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 Siemens-Schuckert GU 343/38-8 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-678 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), one 3.7 cm (1.5 in) Flak M42 and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.[2]

Service history

The boat's career began with training at 5th U-boat Flotilla on 25 October 1943, followed by active service on 1 June 1944 as part of the 7th Flotilla for the remainder of her short service. In one patrol she sank no ships.[3] U-678 was sunk on 7 July 1944 in the English Channel in position 50°32′N 00°23′W / 50.533°N 0.383°W / 50.533; -0.383, by depth charges from the Canadian destroyers HMCS Ottawa, HMCS Kootenay and the Royal Navy corvette HMS Statice. All crew members died.[3]

References

  1. ^ Helgason, Guðmundur. "The Type VIIC boat U-678". German U-boats of WWII - uboat.net. Retrieved 12 November 2014.
  2. ^ a b c d Gröner 1991, pp. 43-46.
  3. ^ a b Busch & Röll 1999.

Bibliography

  • Busch, Rainer; Röll, Hans-Joachim (1999). German U-boat commanders of World War II : a biographical dictionary. Translated by Brooks, Geoffrey. London, Annapolis, Md: Greenhill Books, Naval Institute Press. ISBN 1-55750-186-6.
  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945 [German U-boat losses from September 1939 to May 1945]. Der U-Boot-Krieg (in German). IV. Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0514-2.
  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
  • Sharpe, Peter (1998). U-Boat Fact File. Great Britain: Midland Publishing. ISBN 1-85780-072-9.

External links

  • Helgason, Guðmundur. "The Type VIIC boat U-678". German U-boats of WWII - uboat.net. Retrieved 29 December 2014.