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German submarine U-24 (1936)

Summary

German submarine U-24 was a Type IIB U-boat that was in service of Nazi Germany's Kriegsmarine during World War II. She was laid down on 21 April 1936 at the F. Krupp Germaniawerft in Kiel with yard number 554, launched on 24 September and commissioned into the Kriegsmarine on 10 October. Oberleutnant zur See Heinz Buchholz took command on 3 July 1937.

U-9, a typical Type IIB boat
History
Nazi Germany
NameU-24
Ordered2 February 1935
Builder
Yard number554
Laid down21 April 1936
Launched24 September 1936
Commissioned10 October 1936
FateScuttled on 25 August 1944, at Constanța in the Black Sea
General characteristics
Class and typeType IIB coastal submarine
Displacement
  • 279 t (275 long tons) surfaced
  • 328 t (323 long tons) submerged
Length
Beam
  • 4.08 m (13 ft 5 in) (o/a)
  • 4.00 m (13 ft 1 in) (pressure hull)
Height8.60 m (28 ft 3 in)
Draught3.90 m (12 ft 10 in)
Installed power
  • 700 PS (510 kW; 690 bhp) (diesels)
  • 410 PS (300 kW; 400 shp) (electric)
Propulsion
Speed
  • 13 knots (24 km/h; 15 mph) surfaced
  • 7 knots (13 km/h; 8.1 mph) submerged
Range
  • 1,800 nmi (3,300 km; 2,100 mi) at 12 knots (22 km/h; 14 mph) surfaced
  • 35–43 nmi (65–80 km; 40–49 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth80 m (260 ft)
Complement3 officers, 22 men
Armament
Service record
Part of:
Identification codes: M 24 897
Commanders:
  • Oblt.z.S. Heinz Buchholz
  • 3 July – 30 September 1937
  • Oblt.z.S. / Kptlt. Udo Behrens
  • 8 October 1937 – 17 October 1939
  • Kptlt. Harald Jeppener-Haltenhoff
  • 18 October – 29 November 1939
  • Oblt.z.S. Udo Heilmann
  • 30 November 1939 – 21 August 1940
  • Oblt.z.S. Dietrich Borchert
  • 22 August 1940 – 10 March 1941
  • Oblt.z.S. Helmut Hennig
  • 11 March – 31 July 1941
  • Oblt.z.S. Hardo Rodler von Roithberg
  • 1 August 1941 – 18 April 1942
  • Oblt.z.S. Klaus Petersen
  • 14 October – 17 November 1942
  • Oblt.z.S. Clemens Schöler
  • 18 November 1942 – 15 April 1943
  • Oblt.z.S. / Kptlt. Klaus Petersen
  • 16 April 1943 – 7 April 1944
  • Oblt.z.S. Martin Landt-Hayen
  • 7 April – July 1944
  • Dieter Lenzmann
  • July – 25 Aug 1944
Operations:
  • 19 patrols:
  • 1st patrol:
  • a. 25 – 31 August 1939
  • b. 2 – 5 September 1939
  • c. 6 September 1939
  • 2nd patrol:
  • 13 – 29 September 1939
  • 3rd patrol:
  • 12 – 14 October 1939
  • 4th patrol:
  • a. 23 – 29 October 1939
  • b. 30 October 1939
  • 5th patrol:
  • 6 – 12 January 1940
  • 6th patrol:
  • 27 January – 9 February 1940
  • 7th patrol:
  • a. 14 – 20 March 1940
  • b. 25 – 26 March 1940
  • c. 9 – 10 April 1940
  • 8th patrol:
  • a. 13 April – 5 May 1940
  • b. 6 – 7 May 1940
  • 9th patrol:
  • 27 October – 9 November 1942
  • 10th patrol:
  • 24 November – 16 December 1942
  • 11th patrol:
  • 18 January – 18 February 1943
  • 12th patrol:
  • a. 14 March – 3 April 1943
  • b. 10 – 15 April 1943
  • 13th patrol:
  • a. 5 – 26 June 1943
  • b. 27 – 29 June 1943
  • 14th patrol:
  • 26 July – 25 August 1943
  • 15th patrol:
  • a. 30 September – 18 October 1943
  • b. 20 October – 4 November 1943
  • 16th patrol:
  • 15 January – 10 February 1944
  • 17th patrol:
  • 4 March – 2 April 1944
  • 18th patrol:
  • 2 – 30 May 1944
  • 19th patrol:
  • a. 11 July 1944
  • b. 13 July – 4 August 1944
Victories:
  • 1 merchant ship sunk
    (961 GRT)
  • 5 warships sunk
    (573 tons)
  • 1 merchant ship total loss
    (7,886 GRT)
  • 1 merchant ship damaged
    (7.661 GRT)

Design edit

German Type IIB submarines were enlarged versions of the original Type IIs. U-24 had a displacement of 279 tonnes (275 long tons) when at the surface and 328 tonnes (323 long tons) while submerged. Officially, the standard tonnage was 250 long tons (254 t), however.[1] The U-boat had a total length of 42.70 m (140 ft 1 in), a pressure hull length of 28.20 m (92 ft 6 in), a beam of 4.08 m (13 ft 5 in), a height of 8.60 m (28 ft 3 in), and a draught of 3.90 m (12 ft 10 in). The submarine was powered by two MWM RS 127 S four-stroke, six-cylinder diesel engines of 700 metric horsepower (510 kW; 690 shp) for cruising, two Siemens-Schuckert PG VV 322/36 double-acting electric motors producing a total of 460 metric horsepower (340 kW; 450 shp) for use while submerged. She had two shafts and two 0.85 m (3 ft) propellers. The boat was capable of operating at depths of up to 80–150 metres (260–490 ft).[1]

The submarine had a maximum surface speed of 12 knots (22 km/h; 14 mph) and a maximum submerged speed of 7 knots (13 km/h; 8.1 mph).[1] When submerged, the boat could operate for 35–42 nautical miles (65–78 km; 40–48 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 3,800 nautical miles (7,000 km; 4,400 mi) at 8 knots (15 km/h; 9.2 mph). U-24 was fitted with three 53.3 cm (21 in) torpedo tubes at the bow, five torpedoes or up to twelve Type A torpedo mines, and a 2 cm (0.79 in) anti-aircraft gun. The boat had a complement of twenty-five.[1]

Fate edit

To serve in the 30th U-boat Flotilla, she was transported in sections along the Danube to the Romanian port of Galați. She was then re-assembled at the Galați shipyard and sent to the Black Sea.[2] On 25 August 1944, U-24 was scuttled at Constanţa, on the Romanian Black Sea coast to prevent the advancing Soviet forces from capturing it. She was raised by the Soviet Union in early 1945, but sunk as target practice by the Soviet submarine M-120 on 26 May 1947, off Sevastopol (also sunk that same day was the former U-18).

Summary of raiding history edit

Date Name Nationality Tonnage[Note 1] Fate[3]
9 November 1939 Carmarthen Coast   United Kingdom 961 Sunk (mine)
31 March 1943 Kreml   Soviet Union 7,661 Damaged
15 June 1943 BTSC Zashitnik (No 26)   Soviet Navy 441 Sunk
30 July 1943 Emba   Soviet Union 7,886 Total loss
22 August 1943 DB-36   Soviet Navy 16 Sunk
22 August 1943 DB-37   Soviet Navy 16 Sunk
31 October 1943 SKA-088   Soviet Navy 56 Sunk
12 May 1944 SKA-0376   Soviet Navy 44 Sunk

References edit

Notes edit

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

Citations edit

  1. ^ a b c d Gröner 1991, pp. 39–40.
  2. ^ Steel and Ice: The U-boat Battle in the Arctic and Black Sea 1941–45, Chapter 5 – The Black Sea: War in the South 1942–43, 5th page
  3. ^ Helgason, Guðmundur. "Ships hit by U-24". German U-boats of WWII – uboat.net. Retrieved 29 December 2014.

Bibliography edit

  • Busch, Rainer; Röll, Hans-Joachim (1999). German U-boat commanders of World War II : a biographical dictionary. Translated by Brooks, Geoffrey. London, Annapolis, Md: Greenhill Books, Naval Institute Press. ISBN 1-55750-186-6.
  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945 [German U-boat losses from September 1939 to May 1945]. Der U-Boot-Krieg (in German). Vol. IV. Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0514-2.
  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

External links edit

  • Helgason, Guðmundur. "The Type IIB boat U-24". German U-boats of WWII – uboat.net. Retrieved 6 December 2014.
  • Hofmann, Markus. "U 24". Deutsche U-Boote 1935–1945 – u-boot-archiv.de (in German). Retrieved 6 December 2014.

44°12′N 28°41′E / 44.200°N 28.683°E / 44.200; 28.683

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