U-9, a typical Type IIB boat
|Ordered:||2 February 1935|
|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|
|Class and type:||IIB coastal submarine|
|Height:||8.60 m (28 ft 3 in)|
|Draught:||3.90 m (12 ft 10 in)|
|Test depth:||80 m (260 ft)|
|Complement:||3 officers, 22 men|
|Identification codes:||M 24 897|
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.
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 (250 t), however. 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).
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). 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.
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. 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
|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||7,866||Total loss|
|22 August 1943||DB-36||Soviet Navy||9||Sunk|
|22 August 1943||DB-37||Soviet Navy||9||Sunk|
|31 October 1943||SKA-38||Soviet Navy||56||Sunk|
|12 May 1944||SKA-0376||Soviet Navy||56||Sunk|
- 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.
- 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). 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. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
- 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.