German submarine U-666

History
Nazi Germany
Name	U-666
Ordered	15 August 1940
Builder	Deutsche Werft, Hamburg
Yard number	815
Laid down	16 September 1941
Launched	18 July 1942
Commissioned	26 August 1942
Fate	Sunk on 10 February 1944
General characteristics
Class & 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 (4 bow, 1 stern); 14 × torpedoes; 1 × 8.8 cm (3.46 in) deck gun (220 rounds); 2 × twin 2 cm (0.79 in) C/30 anti-aircraft guns;
Service record
Part of:	5th U-boat Flotilla; 26 August 1942 – 28 February 1943; 6th U-boat Flotilla; 1 March 1943 – 10 February 1944;
Identification codes:	M 51 377
Commanders:	Kptlt. Herbert Engel; 26 August 1942 – 9 December 1943; Oblt.z.S. Ernst Wilberg; 10 December 1943 – 10 February 1944;
Operations:	4 patrols:; 1st patrol:; 25 February – 10 April 1943; 2nd patrol:; 6 May – 9 July 1943; 3rd patrol:; a. 31 August – 16 October 1943; b. 16 – 18 December 1943; 4th patrol:; 25 December 1943 – 10 February 1944;
Victories:	1 warship sunk ; (1,370 tons); 1 merchant ship damaged ; (5,234 GRT);

German submarine U-666 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 16 September 1941 by Deutsche Werft, Hamburg as yard number 815, launched on 18 July 1942 and commissioned on 26 August 1942 under Kapitänleutnant Herbert Engel. Oberleutnant zur See Ernst Wilberg took over command on 10 December 1943.

History

Nazi Germany
Name	U-666
Ordered	15 August 1940
Builder	Deutsche Werft, Hamburg
Yard number	815
Laid down	16 September 1941
Launched	18 July 1942
Commissioned	26 August 1942
Fate	Sunk on 10 February 1944
General characteristics
Class & 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 (4 bow, 1 stern) 14 × torpedoes 1 × 8.8 cm (3.46 in) deck gun (220 rounds) 2 × twin 2 cm (0.79 in) C/30 anti-aircraft guns
Service record
Part of:	5th U-boat Flotilla 26 August 1942 – 28 February 1943 6th U-boat Flotilla 1 March 1943 – 10 February 1944
Identification codes:	M 51 377
Commanders:	Kptlt. Herbert Engel 26 August 1942 – 9 December 1943 Oblt.z.S. Ernst Wilberg 10 December 1943 – 10 February 1944
Operations:	4 patrols: 1st patrol: 25 February – 10 April 1943 2nd patrol: 6 May – 9 July 1943 3rd patrol: a. 31 August – 16 October 1943 b. 16 – 18 December 1943 4th patrol: 25 December 1943 – 10 February 1944
Victories:	1 warship sunk (1,370 tons) 1 merchant ship damaged (5,234 GRT)