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HNLMS O 21
O 21 haven van Gribalter.jpg
O 21
Career
Name: O 21
Builder: Koninklijke Maatschappij De Schelde, Vlissingen
Laid down: 20 November 1937
Launched: 21 October 1939
Commissioned: 10 May 1940
Decommissioned: 2 November 1957
Fate: Sold for scrapping, 24 January 1958
General characteristics [1]
Class & type: O 21-class submarine
Displacement: 990 tons surfaced
1205 tons submerged
Length: 77.7 m (254 ft 11 in)
Beam: 6.8 m (22 ft 4 in)
Draught: 3.95 m (13 ft 0 in)
Propulsion: 2 × 2,500 bhp (1,864 kW) diesel engines
2 × 500 bhp (373 kW) electric motors
Speed: 19.5 kn (36.1 km/h; 22.4 mph) surfaced
9 kn (17 km/h; 10 mph) submerged
Range: 10,000 nmi (19,000 km; 12,000 mi) at 12 kn (22 km/h; 14 mph) surfaced
28 nmi (52 km; 32 mi) at 8.5 kn (15.7 km/h; 9.8 mph) submerged
Complement: 39
Armament: 4 × 21 in (533 mm) bow torpedo tubes
2 × 21 in stern torpedo tubes
2 × 21 in (1×2) external-traversing TT amidships

O 21, laid down K XXI was a O 21-class submarine of the Royal Netherlands Navy that saw service during World War II. During the war she sank several ship among them was the German submarine U-95.

Ship history[edit | edit source]

The submarine was laid down on 20 November 1937 as K XXI at the Koninklijke Maatschappij De Schelde, Vlissingen During construction she was renamed O 21, and was finally launched on 21 October 1939. Following the German invasion of 10 May 1940, the O 21 was hastily commissioned, still incomplete, and sailed for England on 12 May together with her sister O 22 and the tugboat B.V. 37, to be finally completed at the Navy yard in Rosyth.[2]

During the war she operated around England, the Mediterranean sea, Colombo and Fremantle. She survived the war and was decommissioned on 2 November 1957 and sold for scrapping the following year.[2]

Summary of raiding history[edit | edit source]

Ships sunk and damaged by O 21.[3]

Date Ship name Nationality/Type Tonnage (GRT) Fate
3 August 1941 ? Italian barquentine ? Damaged
5 September 1941 Isarco Italian merchant 5738 Sunk
3 October 1941 Oued Yquem Vichy-French merchant 1369 Sunk
22 November 1941 San Salvatore Italian schooner 92 Sunk
28 November 1941 U-95 German submarine 769 tonnes (757 long tons) ↑
871 t (857 long tons) ↓
Sunk 36°24′N 3°20′W / 36.4°N 3.333°W / 36.4; -3.333
13 March 1943 Kasuga Maru No.2 Japanese merchant cargo ship 3967 Sunk
22 April 1943 Yamazato Maru Japanese army cargo ship 6925 Sunk
29 July 1945 ? Japanese coaster ? Damaged
29 July 1945 ? Japanese coaster ? Damaged

References[edit | edit source]

  1. "Dutch Submarines: The O 21 submarine class". dutchsubmarines.com. 2012. http://www.dutchsubmarines.com/classes/class_o21.htm. Retrieved 23 July 2013. 
  2. 2.0 2.1 "Dutch Submarines: The submarine O 21". dutchsubmarines.com. 2012. http://www.dutchsubmarines.com/boats/boat_o21.htm. Retrieved 23 July 2013. 
  3. Helgason, Guðmundur (2013). "HNMS O 21". uboat.net. http://uboat.net/allies/warships/ship/2892.html. Retrieved 23 July 2013. 


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