German submarine UD-4

History
Netherlands
NameHNLMS O 26
Ordered24 June 1938
BuilderRotterdamsche Droogdok Maatschappij, Rotterdam
Laid down20 April 1939
FateIncomplete, captured by German on 14 May 1940
Nazi Germany
NameUD-4
Launched23 November 1940
Commissioned28 January 1941
Decommissioned19 March 1945
FateScuttled on 3 May 1945
General characteristics [1]
Class and typeO 21-class submarine
Displacement
  • 990 tons surfaced
  • 1205 tons submerged
Length77.70 m (254 ft 11 in)
Beam6.80 m (22 ft 4 in)
Draught3.95 m (13 ft 0 in)
Propulsion
Speed
  • 19.5 knots (36.1 km/h; 22.4 mph) surfaced
  • 9 knots (17 km/h; 10 mph) submerged
Range
  • 10,000 nmi (19,000 km; 12,000 mi) at 12 knots (22 km/h; 14 mph) surfaced
  • 28 nmi (52 km; 32 mi) at 8.5 knots (15.7 km/h; 9.8 mph) submerged
Complement39
Armament
  • 4 × 21 in (533 mm) bow torpedo tubes
  • 2 × 21 in stern torpedo tubes
  • 2 × 21 in (1×2) external-traversing TT amidships
Service record as UD-4[2]
Part of:
Identification codes: M 30 414
Commanders:
  • K.Kapt. Helmut Brümmer-Patzig[3]
  • 28 January – 15 October 1941
  • K.Kapt. Rudolf von Singule[4]
  • 16 October 1941 – 29 April 1942
  • Kptlt. Hinrich-Oscar Bernbeck[5]
  • 30 April – May 1942
  • June – 8 December 1942
  • K.Kapt. Friedrich Schäfer[6]
  • 23 March 1943 – 22 November 1944
  • Oblt.z.S. / Kptlt. Fritz Bart[7]
  • 23 November 1944 – 19 March 1945
Operations: None
Victories: None

UD-4 was an O 21-class submarine. The boat was laid down as the Dutch submarine HNLMS K XXVI and renamed HNLMS O 26 but was captured during German invasion of the Netherlands in World War II and commissioned in the Kriegsmarine.

  1. ^ "Dutch Submarines: The O 21 submarine class". dutchsubmarines.com. 2012. Retrieved 28 July 2013.
  2. ^ Helgason, Guðmundur. "Foreign U-boats UD-4". German U-boats of WWII - uboat.net. Retrieved 30 April 2015.
  3. ^ Helgason, Guðmundur. "Helmut Brümmer-Patzig". Uboat.net. Retrieved 30 April 2016.
  4. ^ Helgason, Guðmundur. "Rudolf von Singule". Uboat.net. Retrieved 30 April 2016.
  5. ^ Helgason, Guðmundur. "Hinrich-Oscar Bernbeck". Uboat.net. Retrieved 30 April 2016.
  6. ^ Helgason, Guðmundur. "Friedrich Schäfer". Uboat.net. Retrieved 30 April 2016.
  7. ^ Helgason, Guðmundur. "Fritz Bart". Uboat.net. Retrieved 30 April 2016.