|Ordered:||20 January 1941|
|Builder:||Blohm & Voss, Hamburg|
|Laid down:||3 October 1941|
|Launched:||24 June 1942|
|Commissioned:||13 August 1942|
|Fate:||Sunk 5 April 1943 in the North Atlantic in position Coordinates: , by depth charges from a RAF Liberator.|
|Class and type:||Type VIIC submarine|
|Draught:||4.74 m (15 ft 7 in)|
|Complement:||4 officers, 40–56 enlisted|
|Operations:||8–31 January 1942|
|Victories:||2 merchant ships damaged (14,894 GRT)|
German submarine U-635 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 3 October 1941 by Blohm & Voss, Hamburg as yard number 611, launched on 24 June 1942 and commissioned on 13 August 1942 under Oberleutnant zur See Heinz Eckelmann.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-635 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. 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).
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). 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-635 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.
In one patrol she damaged two merchant ships, for a total of 14,894 gross register tons (GRT).
Convoy HX 231
At 22:15 on 4 April, U-635’s torpedoes struck the lead ship of the column, the British freighter Shillong. U-630 delivered the coup de grâce. She took only 12 minutes to sink.
The next target was the British refrigerated ship Waroonga, carrying much needed butter and cheese from New Zealand for the war-weary British population. She was hit with 2 torpedoes, but stayed afloat thanks to the integrity of her watertight bulkheads. However, it wasn’t to last as she too was despatched by U-630 the following day.
U-635 took part in one wolfpack, namely
- Löwenherz (1–5 April 1943)
Summary of raiding history
|4 April 1943||Shillong||United Kingdom||5,529||Damaged|
|4 April 1943||Waroonga||United Kingdom||9,365||Damaged|
- Helgason, Guðmundur. "The Type VIIC boat U-635". German U-boats of WWII - uboat.net. Retrieved 5 November 2014.
- Gröner 1991, pp. 43-46.
- Helgason, Guðmundur. "Ships hit by U-635". German U-boats of WWII - uboat.net. Retrieved 5 November 2014.
- 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.
- Edwards, Bernard (1996). Dönitz and the Wolfpacks - The U-boats at War. pp. 179, 180, 184. ISBN 0-304-35203-9.
- 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.
- Helgason, Guðmundur. "The Type VIIC boat U-635". German U-boats of WWII - uboat.net. Retrieved 29 December 2014.