German submarine U-28 (1936)

Last updated

U-33 - Unterseeboot (1936) in Brockhaus 1937.jpg
U-33, a typical Type VIIA boat
History
War ensign of Germany (1938-1945).svg Nazi Germany
NameU-28
Ordered1 April 1935
Builder DeSchiMAG AG Weser, Bremen
Cost4,189,000  ℛ︁ℳ︁
Yard number909
Laid down2 December 1935
Launched14 July 1936
Commissioned12 September 1936
FateDamaged in a collision, 17 March 1944, [1] stricken 4 August 1944
General characteristics
Class and type Type VIIA submarine
Displacement
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
Height9.50 m (31 ft 2 in)
Draught4.37 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
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)
Complement4 officers, 40–56 enlisted
Sensors and
processing systems		 Gruppenhorchgerät
Armament
Service record [1] [2]
Part of:
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.

Contents

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. [1]

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. [1]

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. [1]

Construction and design

Construction

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. [1]

Design

Like all Type VIIA submarines, U-28 displaced 626 tonnes (616 long tons) while surfaced and 745 t (733 long tons) when submerged. She was 64.51 m (211 ft 8 in) in overall length and had a 45.50 m (149 ft 3 in) pressure hull. U-28's propulsion consisted of two MAN 6-cylinder 4-stroke M 6 V 40/46 diesel engines that totaled 2,100–2,310 PS (1,540–1,700 kW; 2,070–2,280 bhp). Her maximum rpm was between 470 and 485. The submarine was also equipped with two Brown, Boveri & Cie GG UB 720/8 electric motors that totaled 750 PS (550 kW; 740 shp). Their maximum rpm was 322. These power plants gave U-28 a maximum speed of 17 knots (31 km/h; 20 mph) while surfaced and 8 knots (15 km/h; 9.2 mph) when submerged. She had a range of 6,200  nmi (11,500  km ; 7,100  mi ) while traveling at 10 knots (19 km/h; 12 mph) on the surface and 73–94 nmi (135–174 km; 84–108 mi) at 4 knots (7.4 km/h; 4.6 mph) when submerged.

The U-boat's test depth was 220 m (720 ft) but she could go as deep as 230–250 m (750–820 ft) without having her hull crushed. U-28's armament consisted of five 53.3 cm (21 in) torpedo tubes, (four located in the bow and one in the stern). She could have up to eleven torpedoes on board or 22 TMA mines or 33 TMB mines. U-28 was also equipped with a C35 88 mm gun/L45 deck gun with 220 rounds. Her anti-aircraft defenses consisted of one 2 cm (0.79 in) anti-aircraft gun. [3]

Service history

First patrol

U-28's first war patrol took place from 19 August to 29 September 1939. On 14 September, while sailing around the mouth of St George's Channel, U-28 sank a 5,000 GRT freighter, which was her only success of the patrol. [4]

Second patrol

U-28's second war patrol took place from 8 November to 12 December 1939. For this effort she was instructed to lay a minefield near the port city of Swansea. En route to Bristol, U-28 sank two ships; the 5,000 GRT Dutch tanker MV Sliedrecht and the 5,100 GRT British freighter SS Royston Grange. U-28 then laid her minefield and returned to port in Germany. While the minefield was not an immediate success, it sank the 9,600 GRT British freighter SS Protesilaus 60 days after it was laid. [5]

Third patrol

U-28's third sortie took place from 18 February to 25 March 1940. She was instructed to lay mines off the British Naval Base at Portsmouth. After U-28 laid the minefield, she went on to sink two ships for 11,200 GRT. [6]

Fourth patrol

U-28's fourth war patrol took place from 8 June to 7 July 1940. She was sent to the Western Approaches and turned in an average performance of sinking three ships totalling 10,300 GRT. [7] The Irish government sought an explanation from Germany for the sinking of the neutral Greek ship Adamandios Georgandis : "the entire cargo of which comprised grain for exclusive consumption in Éire" [8] She was sailing from Rosario (in Argentina) to Cork with a cargo of wheat when she was torpedoed and sunk [9] south-west of Ireland at 43°35′N11°15′W / 43.583°N 11.250°W / 43.583; -11.250 .

Fifth patrol

U-28's fifth war patrol took place from 11 August to 17 September 1940 and was one of Kuhnke's most productive. In August, she sank two ships for 5,500 GRT. On 10 September, U-28 found and tracked Convoy OA 210. In the darkness of early morning on 11 September, U-28 attacked the convoy and claimed two large freighters (13,000 GRT each) sunk and caused damage to a 10,000 GRT tanker, bringing Kuhnke's total for the patrol to five ships for 30,000 GRT. However, during the postwar analysis, he was only credited with sinking a 2,000 GRT Dutch freighter and damaging a 4,700 GRT British freighter; which, combined with his earlier sinkings, brought his total to four ships for 9,945 GRT. On his return to Lorient Kuhnke was awarded the Knight's Cross for his work. [10]

Sixth patrol

U-28's sixth and final war patrol took her from Lorient back to Germany; because of the heavy seas and foul weather, U-28 sank only half a ship for 2,694 GRT. (U-28 and U-31 shared credit for the sinking of the SS Matina). On 15 November 1940, she returned to Germany and was turned over to the training command. Günter Kuhnke proceeded to command U-125. [11]

Fate

U-28 sank by accident on 17 March 1944, at the U-boat pier in Neustadt. During a training exercise, the boat had passed under a dummy freighter used for target practice. The commander-in-training failed to note the position of the stationary freighter, and the U-boat's conning tower was ripped off. Water flooded the control room, but the other compartments remained intact. The crew escaped by slowly equalizing the water pressure in the boat and swimming to the surface. The boat was raised in March 1944, but was stricken on 4 August. The submarine's crew suffered no casualties during her career. [1]

Wolfpacks

U-28 took part in one wolfpack, namely:

Summary of raiding history

DateName of ShipNationalityTonnage [Note 1] Fate [12]
14 September 1939 Vancouver City Civil Ensign of the United Kingdom.svg  United Kingdom 4,955Sunk
17 November 1939 Sliedrecht Flag of the Netherlands.svg  Netherlands 5,133Sunk
25 November 1939 Royston Grange Civil Ensign of the United Kingdom.svg  United Kingdom 5,144Sunk
21 January 1940 Protesilaus Civil Ensign of the United Kingdom.svg  United Kingdom 9,577Total loss (mine)
9 March 1940 P. Margoronis Flag of Greece.svg  Greece 4,979Sunk
11 March 1940 Eulota Flag of the Netherlands.svg  Netherlands 6,236Sunk
18 June 1940 Samartia Flag of Finland.svg  Finland 2,417Sunk
19 June 1940 Adamandios Georgandis Flag of Greece.svg  Greece 3,443Sunk
21 June 1940 HMS Prunella Naval Ensign of the United Kingdom.svg  Royal Navy 4,443Sunk
27 August 1940 Eva Flag of Norway.svg  Norway 1,599Sunk
28 August 1940 Kyno Civil Ensign of the United Kingdom.svg  United Kingdom 3,946Sunk
9 September 1940 Mardinian Civil Ensign of the United Kingdom.svg  United Kingdom 2,434Sunk
11 September 1940 Harpenden Civil Ensign of the United Kingdom.svg  United Kingdom 4,678Damaged
11 September 1940 Maas Flag of the Netherlands.svg  Netherlands 1,966Sunk
26 October 1940 Matina Civil Ensign of the United Kingdom.svg  United Kingdom 5,389Damaged

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References

Notes

  1. ↑ Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

Citations

  1. 1 2 3 4 5 6 7 Helgason, Guðmundur. "The Type VIIA boat U-28". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  2. ↑ Helgason, Guðmundur. "War Patrols by German U-boat U-28". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  3. ↑ Gröner 1991, pp. 43–44.
  4. ↑ Helgason, Guðmundur. "Patrol info for U-28 (First patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  5. ↑ Helgason, Guðmundur. "Patrol of U-boat U-28 (Second patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  6. ↑ Helgason, Guðmundur. "Patrol info for U-28 (Third patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  7. ↑ Helgason, Guðmundur. "Patrol info for U-28 (Fourth patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  8. ↑ Duggan, John P (2003). Herr Hempel. Irish Academic Press. p. 111. ISBN   0-7165-2757-X.
  9. ↑ Helgason, Guðmundur. "Adamandios Georgandis". German U-boats of WWII - uboat.net. Retrieved 26 August 2009.
  10. ↑ Helgason, Guðmundur. "Patrol info for U-28 (Fifth patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  11. ↑ Helgason, Guðmundur. "Patrol info for U-28 (Sixth patrol)". German U-boats of WWII - uboat.net. Retrieved 18 December 2009.
  12. ↑ Helgason, Guðmundur. "Ships hit by U-28". German U-boats of WWII - uboat.net. Retrieved 8 December 2014.

Bibliography

54°07′N10°50′E / 54.117°N 10.833°E / 54.117; 10.833

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