German submarine U-821

History
Nazi Germany
Name:	U-821
Ordered:	20 January 1941
Builder:	Oderwerke, Stettin
Laid down:	2 October 1941
Launched:	26 June 1943
Commissioned:	11 October 1943
Fate:	Sunk by aircraft, 10 June 1944
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
Height:	9.60 m (31 ft 6 in)
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:	4th U-boat Flotilla 11 October – 1 November 1943 24th U-boat Flotilla 1 November – 31 December 1943 4th U-boat Flotilla 1 January – 29 February 1944 1st U-boat Flotilla 1 March – 10 June 1944
Commanders:	Lt.z.S. Ludwig Fabricius 11 October – 1 December 1943 Oblt.z.S. Ernst Fischer 2–31 December 1943 Oblt.z.S. Ulrich Knackfuss 1 January – 10 June 1944
Operations:	1st patrol: 19 March – 12 April 1944 2nd patrol: 6–10 June 1944
Victories:	None

German submarine U-821 was a short-lived Type VIIC U-boat of Nazi Germany's Kriegsmarine, built by Oderwerke in Stettin during World War II for service in the Battle of the Atlantic. She only participated in two brief combat patrols, one of which ended after four days when she was sunk by allied aircraft. U-821 was built in Stettin at a small shipyard, and thus took eighteen months to complete, being ready by October 1943. The boat was of the VIIC Type, which possessed long range cruising capabilities as well as five torpedo tubes.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-821 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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