German submarine U-91 (1941)

History

Nazi Germany
Name:	U-91
Ordered:	25 January 1939
Builder:	Flender Werke, Lübeck
Yard number:	295
Laid down:	12 November 1940
Launched:	30 November 1941
Commissioned:	28 January 1942
Fate:	Sunk 26 February 1944 in the Northern Atlantic by British warships
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
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 1 × 8.8 cm (3.46 in) deck gun (220 rounds) various AA guns
Service record
Part of:	Kriegsmarine: 5th U-boat Flotilla 9th U-boat Flotilla
Commanders:	Kptlt. Heinz Walkerling 28 January – 31 August 1942 Kptlt. Heinz Hungerhausen 1 September 1942 – 26 February 1944
Operations:	Six 1st patrol: 15 August – 6 October 1942 2nd patrol: 1 November – 26 December 1942 3rd patrol: 11 February – 29 March 1943 4th patrol: 29 April – 7 June 1943 5th patrol: 21 September – 22 November 1943 6th patrol: 25 January – 26 February 1944
Victories:	Four ships sunk for a total of 26,194 GRT; one warship sunk of 1,375 tons

German submarine U-91 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.

She was laid down at the Flender Werke in Lübeck as yard number 295, launched on 30 November 1941 and commissioned on 28 January 1942 with Oberleutnant zur See Heinz Walkerling as commanding officer. Command was transferred to Oblt.z.S. Heinz Hungershausen on 20 April 1943.

She was a fairly successful boat, sinking over 26,000 tons of Allied shipping in a career lasting just 14 months and six patrols. She was a member of fifteen wolfpacks. After training with the 5th U-boat Flotilla, U-91 was assigned to the 9th flotilla on 1 September 1942 for operations.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-91 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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