German submarine UD-4

History
Netherlands
Name	HNLMS O 26
Ordered	24 June 1938
Builder	Rotterdamsche Droogdok Maatschappij, Rotterdam
Yard number	RDM-209
Laid down	20 April 1939
Fate	Incomplete, captured by German on 14 May 1940
Nazi Germany
Name	UD-4
Launched	23 November 1940
Commissioned	28 January 1941
Decommissioned	19 March 1945
Fate	Scuttled on 3 May 1945
General characteristics
Class & type	O 21-class submarine
Displacement	990 tons surfaced ; 1205 tons submerged;
Length	77.70 m (254 ft 11 in)
Beam	6.80 m (22 ft 4 in)
Draught	3.95 m (13 ft 0 in)
Propulsion	2 × 2,500 PS (2,466 bhp; 1,839 kW) diesel engines ; 2 × 500 PS (493 bhp; 368 kW) electric motors;
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;
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;
Service record as UD-4
Part of:	1st U-boat Flotilla; January – April 1941; 3rd U-boat Flotilla; May – July 1941; 5th U-boat Flotilla; August 1941 – December 1942; 27th U-boat Flotilla; January 1943 – November 1944; 24th U-boat Flotilla; November 1944 – January 1945; 18th U-boat Flotilla; January – March 1945;
Identification codes:	M 30 414
Commanders:	K.Kapt. Helmut Brümmer-Patzig; 28 January – 15 October 1941; K.Kapt. Rudolf von Singule; 16 October 1941 – 29 April 1942; Kptlt. Hinrich-Oscar Bernbeck; 30 April – May 1942; June – 8 December 1942; K.Kapt. Friedrich Schäfer; 23 March 1943 – 22 November 1944; Oblt.z.S. / Kptlt. Fritz Bart; 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.

History

Netherlands
Name	HNLMS O 26
Ordered	24 June 1938
Builder	Rotterdamsche Droogdok Maatschappij, Rotterdam
Yard number	RDM-209
Laid down	20 April 1939
Fate	Incomplete, captured by German on 14 May 1940
Nazi Germany
Name	UD-4
Launched	23 November 1940
Commissioned	28 January 1941
Decommissioned	19 March 1945
Fate	Scuttled on 3 May 1945
General characteristics
Class & type	O 21-class submarine
Displacement	990 tons surfaced 1205 tons submerged
Length	77.70 m (254 ft 11 in)
Beam	6.80 m (22 ft 4 in)
Draught	3.95 m (13 ft 0 in)
Propulsion	2 × 2,500 PS (2,466 bhp; 1,839 kW) diesel engines 2 × 500 PS (493 bhp; 368 kW) electric motors
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
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
Service record as UD-4
Part of:	1st U-boat Flotilla January – April 1941 3rd U-boat Flotilla May – July 1941 5th U-boat Flotilla August 1941 – December 1942 27th U-boat Flotilla January 1943 – November 1944 24th U-boat Flotilla November 1944 – January 1945 18th U-boat Flotilla January – March 1945
Identification codes:	M 30 414
Commanders:	K.Kapt. Helmut Brümmer-Patzig 28 January – 15 October 1941 K.Kapt. Rudolf von Singule 16 October 1941 – 29 April 1942 Kptlt. Hinrich-Oscar Bernbeck 30 April – May 1942 June – 8 December 1942 K.Kapt. Friedrich Schäfer 23 March 1943 – 22 November 1944 Oblt.z.S. / Kptlt. Fritz Bart 23 November 1944 – 19 March 1945
Operations:	None
Victories:	None