German submarine U-102 (1940)

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For other ships with the same name, see German submarine U-102.
U 52.jpg
U-52, a typical Type VIIB boat
History
Nazi Germany
Name: U-102
Ordered: 15 December 1937
Builder:

Germaniawerft, Kiel

Ship yard number=596
Laid down: 22 May 1939
Launched: 21 March 1940
Commissioned: 27 April 1940
Fate: Sunk south-west of Ireland on 1 July 1940, by a British warship
General characteristics
Class and type: Type VIIB submarine
Displacement:
  • 753 tonnes (741 long tons) surfaced
  • 857 t (843 long tons) submerged
Length:
Beam:
  • 6.20 m (20 ft 4 in) o/a
  • 4.70 m (15 ft 5 in) pressure hull
Height: 9.50 m (31 ft 2 in)
Draught: 4.74 m (15 ft 7 in)
Installed power:
  • 2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels)
  • 750 PS (550 kW; 740 shp) (electric)
Propulsion:
Range:
  • 8,700 nmi (16,100 km; 10,000 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 90 nmi (170 km; 100 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:
Service record
Part of: Kriegsmarine: 7th U-boat Flotilla
Commanders: Kptlt. Harro von Klot-Heydenfeldt
Operations: 22 June – 1 July 1940
Victories: Two ships sunk (5,430 GRT)

German submarine U-102 was a Type VIIB submarine of Nazi Germany's Kriegsmarine during World War II.

The U-boat was laid down on 22 May 1939 at the Friedrich Krupp Germaniawerft shipyard at Kiel as yard number 596, launched on 21 March 1940 and commissioned on 27 April under the command of Kapitänleutnant Harro von Klot-Heydenfeldt to serve with the 7th U-boat Flotilla from 27 April 1940 to 1 June for crew training and operationally until she was sunk on 1 July. She sank two Allied ships, claiming 5,430 gross register tons (GRT).

Design[edit]

German Type VIIB submarines were preceded by the shorter Type VIIA submarines. U-102 had a displacement of 753 tonnes (741 long tons) when at the surface and 857 tonnes (843 long tons) while submerged.[1] She had a total length of 66.50 m (218 ft 2 in), a pressure hull length of 48.80 m (160 ft 1 in), a beam of 6.20 m (20 ft 4 in), a height of 9.50 m (31 ft 2 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two AEG GU 460/8-276 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).[1]

The submarine had a maximum surface speed of 17.9 knots (33.2 km/h; 20.6 mph) and a maximum submerged speed of 8 knots (15 km/h; 9.2 mph).[1] When submerged, the boat could operate for 90 nautical miles (170 km; 100 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,700 nautical miles (16,100 km; 10,000 mi) at 10 knots (19 km/h; 12 mph). U-102 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and one 2 cm (0.79 in) anti-aircraft gun. The boat had a complement of between forty-four and sixty.[1]

Service history[edit]

U-70's first and only patrol began on 22 June 1940. Having sunk the Castleton near the Orkney Islands on the 28th and the Clearton about 180 nmi (330 km; 210 mi) west of Ushant (often known as Ouessant, an island in northwest France)[2] on 1 July, she was herself sunk on the same day as the latter ship by depth charges from a British destroyer, HMS Vansittart.

43 men died with the submarine; there were no survivors.

After the U-boat's sinking, Vansittart rescued the 26 survivors from Clearton.

Previously Recorded Fate[edit]

U-102 was originally believed to have been sunk in the Bay of Biscay due to unknown causes on or after 30 June 1940.

Summary of raiding history[edit]

Date Ship Nationality Tonnage Fate
28 June 1940 Castleton  United Kingdom 211 Sunk
1 July 1940 Clearton  United Kingdom 5,219 Sunk

See also[edit]

References[edit]

  1. ^ a b c d Gröner 1991, pp. 43–44.
  2. ^ The Times Atlas of the World - Third edition, revised 1995, ISBN 0 7230 0809 4, p. 14

Bibliography[edit]

  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 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. 

External links[edit]

  • Helgason, Guðmundur. "The Type VII boat U-102". German U-boats of WWII - uboat.net. Retrieved 8 December 2014. 
  • Hofmann, Markus. "U 102". Deutsche U-Boote 1935-1945 - u-boot-archiv.de (in German). Retrieved 30 January 2015. 

Coordinates: 48°33′N 10°26′W / 48.550°N 10.433°W / 48.550; -10.433