German submarine U-172

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U-505, a typical Type IXC boat
History
Nazi Germany
Name	U-172
Ordered	23 December 1939
Builder	DeSchiMAG AG Weser, Bremen
Yard number	1012
Laid down	11 December 1940
Launched	31 July 1941
Commissioned	5 November 1941
Fate	Sunk, 13 December 1943, by US aircraft and warships
General characteristics
Class and type	Type IXC submarine
Displacement	1,120 t (1,100 long tons) surfaced 1,232 t (1,213 long tons) submerged
Length	76.76 m (251 ft 10 in) o/a 58.75 m (192 ft 9 in) pressure hull
Beam	6.76 m (22 ft 2 in) o/a 4.40 m (14 ft 5 in) pressure hull
Height	9.60 m (31 ft 6 in)
Draught	4.70 m (15 ft 5 in)
Installed power	4,400 PS (3,200 kW; 4,300 bhp) (diesels) 1,000 PS (740 kW; 990 shp) (electric)
Propulsion	2 shafts 2 × diesel engines 2 × electric motors
Speed	18.3 knots (33.9 km/h; 21.1 mph) surfaced 7.3 knots (13.5 km/h; 8.4 mph) submerged
Range	13,450 nmi (24,910 km; 15,480 mi) at 10 knots (19 km/h; 12 mph) surfaced 64 nmi (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	230 m (750 ft)
Complement	4 officers, 44 enlisted
Armament	6 × torpedo tubes (4 bow, 2 stern) 22 × 53.3 cm (21 in) torpedoes 1 × 10.5 cm (4.1 in) SK C/32 deck gun (180 rounds) 1 × 3.7 cm (1.5 in) SK C/30 AA gun 1 × twin 2 cm FlaK 30 AA guns
Service record
Part of:	4th U-boat Flotilla 5 November 1941 – 30 April 1942 10th U-boat Flotilla 1 May 1942 – 13 December 1943
Identification codes:	M 29 596
Commanders:	Kptlt. Carl Emmermann 5 November 1941 – 31 October 1943 Oblt.z.S. Hermann Hoffmann 1 November 1943 – 13 December 1943
Operations:	6 patrols: 1st patrol: 22 April – 3 May 1943 2nd patrol: 11 May – 21 July 1942 3rd patrol: 19 August – 27 December 1942 4th patrol: 21 February – 17 April 1943 5th patrol: 29 May – 7 September 1943 6th patrol: 22 November – 13 December 1943
Victories:	26 merchant ships sunk (152,080 GRT)

German submarine U-172 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. She was first assigned to the 4th U-boat Flotilla for training and on 1 May 1942 was reassigned to the 10th flotilla, an operational long-range organization.