German submarine U-636

History
Nazi Germany
Name:	U-636
Ordered:	20 January 1941
Builder:	Blohm & Voss, Hamburg
Yard number:	612
Laid down:	2 October 1941
Launched:	25 June 1942
Commissioned:	20 August 1942
Fate:	Sunk 21 April 1945 in the North Atlantic in position 55°50′N 10°31′W / 55.833°N 10.517°W / 55.833; -10.517Coordinates: 55°50′N 10°31′W / 55.833°N 10.517°W / 55.833; -10.517, by depth charges from HMS Bazely, HMS Drury and HMS Bentinck.
General characteristics
Class and 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
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 (four bow, one stern) 14 × torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun (220 rounds) various AA guns
Service record
Part of:	5th U-boat Flotilla 20 August 1942 – 31 March 1943 - Training 11th U-boat Flotilla 1 April – 31 October 1943 13th U-boat Flotilla 1 November 1943 – 21 April 1945
Commanders:	Kptlt. Hans Hildebrandt 20 August 1942 – 14 February 1944 Oblt.z.S. Eberhard Schendel 15 February 1944 – 21 April 1945
Operations:	1st patrol: 2 May – 8 June 1943 2nd patrol: 31 July – 7 August 1943 3rd patrol: 17–30 August 1943 4th patrol: 6–17 November 1943 5th patrol: 23 November – 27 December 1943 6th patrol: 30 December 1943 – 8 January 1944 7th patrol: 26 January – 2 February 1944 8th patrol: 8 April – 3 May 1944 9th patrol: 27 June – 23 July 1944 10th patrol: 25 August – 12 September 1944 11th patrol: 25 September – 3 October 1944 12th patrol: 6 October – 12 November 1944 13th patrol: 4–16 December 1944 14th patrol: 25 December 1944 – 30 January 1945 15th patrol: 1–21 April 1945
Victories:	1 merchant ship sunk (7,169 GRT)

German submarine U-636 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 2 October 1941 by Blohm & Voss, Hamburg as yard number 612, launched on 25 June 1942 and commissioned on 20 August 1942 under Oberleutnant zur See Hans Hildebrandt.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-636 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).

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