German submarine U-28 (1936)

	U-33, a typical Type VIIA boat
History
Nazi Germany
Name	U-28
Ordered	1 April 1935
Builder	DeSchiMAG AG Weser, Bremen
Cost	4,189,000 ℛ︁ℳ︁
Yard number	909
Laid down	2 December 1935
Launched	14 July 1936
Commissioned	12 September 1936
Fate	Damaged in a collision, 17 March 1944, stricken 4 August 1944
General characteristics
Class and type	Type VIIA submarine
Displacement	626 tonnes (616 long tons) surfaced; 745 t (733 long tons) submerged;
Length	64.51 m (211 ft 8 in) o/a; 45.50 m (149 ft 3 in) pressure hull;
Beam	5.85 m (19 ft 2 in) o/a; 4.70 m (15 ft 5 in) pressure hull;
Height	9.50 m (31 ft 2 in)
Draught	4.37 m (14 ft 4 in)
Installed power	2,100–2,310 PS (1,540–1,700 kW; 2,070–2,280 bhp) (diesels); 750 PS (550 kW; 740 shp) (electric);
Propulsion	2 shafts; 2 × diesel engines; 2 × electric motors;
Speed	17 knots (31 km/h; 20 mph) surfaced; 8 knots (15 km/h; 9.2 mph) submerged;
Range	6,200 nmi (11,500 km; 7,100 mi) at 10 knots (19 km/h; 12 mph) surfaced; 73–94 nmi (135–174 km; 84–108 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	220 m (720 ft); Crush depth: 230–250 m (750–820 ft);
Complement	4 officers, 40–56 enlisted
Sensors and ; processing systems	Gruppenhorchgerät
Armament	5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern); 11 torpedoes or 22 TMA mines or 33 TMB mines; 1 × 8.8 cm (3.46 in) deck gun (220 rounds); 1 × 2 cm (0.79 in) C/30 anti-aircraft gun;
Service record
Part of:	2nd U-boat Flotilla; 12 September 1936 – 9 November 1940; 24th U-boat Flotilla; 10 November 1940 – 30 November 1943; 22nd U-boat Flotilla; 1 December 1943 – 17 March 1944;
Identification codes:	M 27 436
Commanders:	Kptlt. Wilhelm Ambrosius; 12 September 1936 – 1 November 1938; Kptlt. Hans-Günther Looff; 1936 / 37 – 30 September 1937; Oblt.z.S. Fritz-Julius Lemp; 28 October – November 1938; Oblt.z.S. / Kptlt. Günter Kuhnke; 28 October 1938 – 16 November 1940; Oblt.z.S. Friedrich Guggenberger; 16 November 1940 – 11 February 1941; Oblt.z.S. Heinrich Ratsch; 12 February – 21 June 1941; Oblt.z.S. Hermann Eckhardt; 22 June 1941 – 20 March 1942; Oblt.z.S. Karl-Heinz Marbach; 1 July – 30 November 1942; Lt.z.S. / Oblt.z.S. Uwe Christiansen; 1 December 1942 – July 1943; Lt.z.S. / Oblt.z.S. Erich Krempl; July – 1 December 1943; Oblt.z.S. Dietrich Sachse; 2 December 1943 – 17 March 1944;
Operations:	6 patrols:; 1st patrol:; 19 August – 29 September 1939; 2nd patrol:; 8 November – 18 December 1939; 3rd patrol:; 18 February – 23 March 1940; 4th patrol:; 20 May – 6 July 1940; 5th patrol:; a. 11 August – 17 September 1940; b. 4 – 6 Oct 1940; 6th patrol:; 12 October – 15 November 1940;
Victories:	11 merchant ships sunk ; (42,252 GRT); 1 auxiliary warship sunk ; (4,443 GRT); 1 merchant ship total loss ; (9,577 GRT) ; 2 merchant ships damaged ; (10,067 GRT);

German submarine U-28 was a Type VIIA U-boat of Nazi Germany's Kriegsmarine during World War II.

Her keel was laid down on 2 December 1935, by DeSchiMAG AG Weser of Bremen. She was launched on 14 July 1936, and commissioned into Kriegsmarine on 12 September 1936, with Kapitänleutnant Wilhelm Ambrosius in command. Ambrosius was succeeded by nine other commanding officers over the next eight years.

U-28 conducted seven war patrols between 19 August 1939 and 15 November 1940, all under the command of Kapitänleutnant Günter Kuhnke, sinking 13 ships totaling 56,272 gross register tons (GRT) and damaging two others totaling 10,067 GRT.

After her third patrol, U-28 became a training vessel and was used to bring new U-boat crews up to standard. She was later sunk in an accident on 17 March 1944 and stricken on 4 August 1944.

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