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 Reichsmark
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
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) 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 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 Oblt.z.S. Uwe Christiansen 1 December 1942 – July 1943 Oblt.z.S. Erich Krempl July – 1 December 1943 Oblt.z.S. Dietrich Sachse 2 December 1943 – 17 March 1944
Operations:	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: 11 August – 17 September 1940 6th patrol: 12 October – 15 November 1940
Victories:	11 ships sunk (42,252 GRT) one auxiliary warship (4,443 GRT) two ships damaged (10,067 GRT) one ship a total loss (9,577 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.

U-28 was ordered by the Kriegsmarine on 1 April 1935 as part of the German Plan Z and in violation of the Treaty of Versailles. Her keel was laid down in the AG Weser shipyard in Bremen as yard number 909 on 2 December 1935. After about ten months of construction, she was launched on 14 July 1936 and commissioned into the Kriegsmarine as the third Type VIIA submarine on 12 September 1936 under the command of Kapitänleutnant Wilhelm Ambrosius.