HNLMS O 21

O 21
History
Netherlands
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 and 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 an O 21-class submarine of the Royal Netherlands Navy that saw service during World War II. During the war she sank several ships, among them the German submarine U-95.