German submarine U-24 (1936)

	U-9, a typical Type IIB boat
History
Nazi Germany
Name	U-24
Ordered	2 February 1935
Builder	Germaniawerft, Kiel ; Galați shipyard, Romania ;
Yard number	554
Laid down	21 April 1936
Launched	24 September 1936
Commissioned	10 October 1936
Fate	Scuttled on 25 August 1944, at Constanța in the Black Sea
General characteristics
Class and type	Type IIB coastal submarine
Displacement	279 t (275 long tons) surfaced; 328 t (323 long tons) submerged;
Length	42.70 m (140 ft 1 in) o/a ; 27.80 m (91 ft 2 in) pressure hull ;
Beam	4.08 m (13 ft 5 in) (o/a); 4.00 m (13 ft 1 in) (pressure hull);
Height	8.60 m (28 ft 3 in)
Draught	3.90 m (12 ft 10 in)
Installed power	700 PS (510 kW; 690 bhp) (diesels); 410 PS (300 kW; 400 shp) (electric);
Propulsion	2 shafts; 2 × diesel engines ; 2 × electric motors ;
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 depth	80 m (260 ft)
Complement	3 officers, 22 men
Armament	3 × 53.3 cm (21 in) torpedo tubes ; 5 × torpedoes or up to 12 TMA or 18 TMB mines ; 1 × 2 cm (0.79 in) C/30 anti-aircraft gun;
Service record
Part of:	3rd U-boat Flotilla ; 1 October 1936 – 1 August 1939; 1 September – 17 October 1939; 1st U-boat Flotilla ; 18 October 1939 – 30 April 1940; 1st U-boat Training Flotilla ; 1 May – 30 June 1940; 21st U-boat Flotilla ; 1 July 1940 – 18 April 1942; 30th U-boat Flotilla ; 14 October 1942 – 25 August 1944;
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);

Last updated February 24, 2024

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.

Design

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

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

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

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References

Notes

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

Citations

1 2 3 4 Gröner 1991, pp. 39–40.
↑ 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
↑ Helgason, Guðmundur. "Ships hit by U-24". German U-boats of WWII – uboat.net. Retrieved 29 December 2014.

Bibliography

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

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′N28°41′E / 44.200°N 28.683°E / 44.200; 28.683

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[tonnage-3] Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

[FOOTNOTEGröner199139–40-1] 1 2 3 4 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

[4] Helgason, Guðmundur. "Ships hit by U-24". German U-boats of WWII – uboat.net. Retrieved 29 December 2014.

[1]

[2]

[Note 1]

[3]

v t e German Type II submarines
Type IIA	U-1 U-2 U-3 U-4 U-5 U-6
Type IIB	U-7 U-8 U-9 U-10 U-11 U-12 U-13 U-14 U-15 U-16 U-17 U-18 U-19 U-20 U-21 U-22 U-23 U-24 U-120 U-121
Type IIC	U-56 U-57 U-58 U-59 U-60 U-61 U-62 U-63
Type IID	U-137 U-138 U-139 U-140 U-141 U-142 U-143 U-144 U-145 U-146 U-147 U-148 U-149 U-150 U-151 U-152
Preceded by: Type I Followed by: Type VII List of U-boats of Germany

v t e Shipwrecks and maritime incidents in August 1944
Shipwrecks	2 Aug: USS Fiske 3 Aug: HMS Quorn 4 Aug: Tannenfels, Matsu 5 Aug: Mefküre, U-671 6 Aug: Empire City, Sachsenwald, Thétis, U-471, U-736, U-952, U-969, V 215 Oliva 7 Aug: Amsterdam, Empire Day, Nagara 8 Aug: Conte Verde, HMCS Regina, Tama Maru No. 6, V 404 Falke 9 Aug: Spichern 10 Aug: U-608 11 Aug: U-385, U-967 12 Aug: T-114, T-118, U-198, U-981, V 410 Germania 13 Aug: USS Flier, U-270, V 1101 Preußsen 14 Aug: Gueydon, U-618 15 Aug: U-741 16 Aug: Trémintin 18 Aug: La Galissonnière, Natori, Strasbourg, Taiyō, Teia Maru, U-107, U-129, U-621, V 406 Hans Loh 19 Aug: Commandant Teste, Hayasui, Tamatsu Maru , U-123, U-466, V-6112 Friese 20 Aug: Richard Montgomery, U-9, U-413, U-984, U-1229. V 409 August Bösch 21 Aug: HMCS Alberni, HMS Kite, HMS Orchis, U-230, V 402 Dr. Adolf Spilker, Z23 22 Aug: HMS Bickerton, HMS Loyalty, Matsuwa, Tsushima Maru , U-344, V 401 Jan Mayen, V 405 J. Hinrich Wilhelms, V 413 Ferdinand Niedermeyer 23 Aug: Asakaze, U-180 24 Aug: USS Harder, NMS Mihail Kogălniceanu, U-354, U-445, Z37 25 Aug: Sperrbrecher 136 , U-18, U-24, U-178, U-667, UIT-21, Yūnagi, Z24 26 Aug: Samidare, U-188, V 404 Baden, V 411 Saarland 27 Aug: HMS Britomart, Clemenceau, HMS Hussar 28 Aug: John Barry, V 407 Dorum 30 Aug: De Grasse, M553 31 Aug: Shirataka Unknown date: Condorcet, Marechal Petain, U-925
Other incidents	4 Aug: Maycrest 15 Aug: LST-404 16 Aug: USS S-38 18 Aug: U-1054 20 Aug: Daronia 22 Aug: HMS Nabob 27 Aug: USS Pollack 31 Aug: U-1000
1943 1944 1945 July 1944 September 1944

History
U-9, a typical Type IIB boat
Nazi Germany
Name	U-24
Ordered	2 February 1935
Builder	Germaniawerft, Kiel Galați shipyard, Romania
Yard number	554
Laid down	21 April 1936
Launched	24 September 1936
Commissioned	10 October 1936
Fate	Scuttled on 25 August 1944, at Constanța in the Black Sea
General characteristics
Class and type	Type IIB coastal submarine
Displacement	279 t (275 long tons) surfaced 328 t (323 long tons) submerged
Length	42.70 m (140 ft 1 in) o/a 27.80 m (91 ft 2 in) pressure hull
Beam	4.08 m (13 ft 5 in) (o/a) 4.00 m (13 ft 1 in) (pressure hull)
Height	8.60 m (28 ft 3 in)
Draught	3.90 m (12 ft 10 in)
Installed power	700 PS (510 kW; 690 bhp) (diesels) 410 PS (300 kW; 400 shp) (electric)
Propulsion	2 shafts 2 × diesel engines 2 × electric motors
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 depth	80 m (260 ft)
Complement	3 officers, 22 men
Armament	3 × 53.3 cm (21 in) torpedo tubes 5 × torpedoes or up to 12 TMA or 18 TMB mines 1 × 2 cm (0.79 in) C/30 anti-aircraft gun
Service record
Part of:	3rd U-boat Flotilla 1 October 1936 – 1 August 1939 1 September – 17 October 1939 1st U-boat Flotilla 18 October 1939 – 30 April 1940 1st U-boat Training Flotilla 1 May – 30 June 1940 21st U-boat Flotilla 1 July 1940 – 18 April 1942 30th U-boat Flotilla 14 October 1942 – 25 August 1944
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)