German submarine U-664

History
Nazi Germany
Name:	U-664
Ordered:	15 August 1940
Builder:	Howaldtswerke, Hamburg
Yard number:	813
Laid down:	11 July 1941
Launched:	28 April 1942
Commissioned:	17 June 1942
Fate:	Sunk 9 August 1943 in the North Atlantic in position 40°12′N 37°29′W / 40.200°N 37.483°W / 40.200; -37.483Coordinates: 40°12′N 37°29′W / 40.200°N 37.483°W / 40.200; -37.483, by depth charges from USN Grumman Avenger aircraft.
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 ratings
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:	8th U-boat Flotilla 17 June – 31 October 1942 - Training 9th U-boat Flotilla 1 November 1942 – 9 August 1943
Identification codes:	M 05 024
Commanders:	Oblt.z.S. Adolf Graef 17 June 1942 – 9 August 1943
Operations:	1st patrol: 20 October – 10 November 1942 2nd patrol: 5 December 1942 – 13 January 1943 3rd patrol: 14 February – 28 March 1943 4th patrol: 29 April – 9 June 1943 5th patrol: 21 July 1942 – 9 August 1943
Victories:	three merchant ships sunk (19,325 GRT)

German submarine U-664 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 11 July 1941 by Howaldtswerke, Hamburg as yard number 813, launched on 28 April 1942 and commissioned on 17 June 1942 under Oberleutnant zur See Adolf Graef.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-664 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 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).

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