German submarine U-503

	U-505, a typical Type IXC boat
History
Nazi Germany
Name	U-503
Ordered	25 September 1939
Builder	Deutsche Werft, Hamburg
Yard number	293
Laid down	29 April 1940
Launched	5 April 1941
Commissioned	10 July 1941
Fate	Sunk on 15 March 1942
General characteristics
Class and type	Type IXC submarine
Displacement	1,120 t (1,100 long tons) surfaced; 1,232 t (1,213 long tons) submerged;
Length	76.76 m (251 ft 10 in) o/a; 58.75 m (192 ft 9 in) pressure hull;
Beam	6.76 m (22 ft 2 in) o/a; 4.40 m (14 ft 5 in) pressure hull;
Height	9.60 m (31 ft 6 in)
Draught	4.70 m (15 ft 5 in)
Installed power	4,400 PS (3,200 kW; 4,300 bhp) (diesels); 1,000 PS (740 kW; 990 shp) (electric);
Propulsion	2 shafts; 2 × diesel engines; 2 × electric motors;
Speed	18.2 knots (33.7 km/h; 20.9 mph) surfaced; 7.7 knots (14.3 km/h; 8.9 mph) submerged;
Range	13,450 nmi (24,910 km; 15,480 mi) at 10 knots (19 km/h; 12 mph) surfaced; 64 nmi (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	230 m (750 ft)
Complement	4 officers, 44 enlisted
Armament	6 × torpedo tubes (4 bow, 2 stern); 22 × 53.3 cm (21 in) torpedoes; 1 × 10.5 cm (4.1 in) SK C/32 deck gun (180 rounds); 1 × 3.7 cm (1.5 in) SK C/30 AA gun; 1 × twin 2 cm FlaK 30 AA guns;
Service record
Part of:	2nd U-boat Flotilla; 10 July 1941 – 15 March 1942;
Identification codes:	M 43 854
Commanders:	Kptlt. Otto Gericke; 10 July 1941 – 15 March 1942;
Operations:	1 patrol:; 28 February – 15 March 1942;
Victories:	None

German submarine U-503 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 29 April 1940 at the Deutsche Werft yard in Hamburg as yard number 293, launched on 5 April 1941 and commissioned on 10 July 1941 under the command of Kapitänleutnant Otto Gericke.

The boat's service began with her being assigned to the 2nd U-boat Flotilla on her commissioning date for training and continuing with it for operations from 1 February 1942.

Design

German Type IXC submarines were slightly larger than the original Type IXBs. U-503 had a displacement of 1,120 tonnes (1,100 long tons) when at the surface and 1,232 tonnes (1,213 long tons) while submerged.^[4] The U-boat had a total length of 76.76 m (251 ft 10 in), a pressure hull length of 58.75 m (192 ft 9 in), a beam of 6.76 m (22 ft 2 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.70 m (15 ft 5 in). The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4,400 metric horsepower (3,240 kW; 4,340 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 shaft horsepower (1,010 PS; 750 kW) for use while submerged. She had two shafts and two 1.92 m (6 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).^[4]

The submarine had a maximum surface speed of 18.3 knots (33.9 km/h; 21.1 mph) and a maximum submerged speed of 7.3 knots (13.5 km/h; 8.4 mph).^[4] When submerged, the boat could operate for 63 nautical miles (117 km; 72 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 13,450 nautical miles (24,910 km; 15,480 mi) at 10 knots (19 km/h; 12 mph). U-503 was fitted with six 53.3 cm (21 in) torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one 10.5 cm (4.13 in) SK C/32 naval gun, 180 rounds, and a 3.7 cm (1.5 in) SK C/30 as well as a 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of forty-eight.^[4]

Service history

U-503's first and only active war patrol began at Bergen in Norway on 28 February 1942, following two previous port to port sailings.^[3] The U-boat was sunk on 15 March by depth charges dropped by a PBO-1 Hudson of United States Navy squadron VP-82 south-east of Newfoundland, in position 45°50′N 48°50′W / 45.833°N 48.833°W / 45.833; -48.833.^[2]

The aircraft, from Argentia, was escorting Convoy ON-72. The PBO-1s were twenty Hudson Mk.IIIA aircraft diverted from Lend-Lease to equip VP-82, and sank the first two U-boats by US forces; U-656 on 1 March 1942 and U-503.^[2]

References

^ Kemp 1999, p. 79.
^ ^a ^b ^c Helgason, Guðmundur. "The Type IXC boat U-503". German U-boats of WWII – uboat.net. Retrieved 24 January 2010.
^ ^a ^b Helgason, Guðmundur. "War Patrols by German U-boat U-503". German U-boats of WWII – uboat.net. Retrieved 24 January 2010.
^ ^a ^b ^c ^d Gröner 1991, p. 68.

Bibliography

Busch, Rainer; Röll, Hans-Joachim (1999). German U-boat commanders of World War II : a biographical dictionary. Translated by Brooks, Geoffrey. London, Annapolis, Md: Greenhill Books, Naval Institute Press. ISBN 1-55750-186-6.
Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945 [German U-boat losses from September 1939 to May 1945]. Der U-Boot-Krieg (in German). Vol. 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. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
Kemp, Paul (1999). U-Boats Destroyed – German Submarine Losses in the World Wars. London: Arms & Armour. ISBN 1-85409-515-3.

External links

Helgason, Guðmundur. "The Type IXC boat U-503". German U-boats of WWII – uboat.net. Retrieved 7 December 2014.

[FOOTNOTEKemp199979-1] Kemp 1999, p. 79.

[uboatnet-2] Helgason, Guðmundur. "The Type IXC boat U-503". German U-boats of WWII – uboat.net. Retrieved 24 January 2010.

[patrols-3] Helgason, Guðmundur. "War Patrols by German U-boat U-503". German U-boats of WWII – uboat.net. Retrieved 24 January 2010.

[FOOTNOTEGröner199168-4] Gröner 1991, p. 68.

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[4]

v t e German Type IXC submarine
U-66 U-67 U-68 U-125 U-126 U-127 U-128 U-129 U-130 U-131 U-153 U-154 U-155 U-156 U-157 U-158 U-159 U-160 U-161 U-162 U-163 U-164 U-165 U-166 U-171 U-172 U-173 U-174 U-175 U-176 U-501 U-502 U-503 U-504 U-505 U-506 U-507 U-508 U-509 U-510 U-511 U-512 U-513 U-514 U-515 U-516 U-517 U-518 U-519 U-520 U-521 U-522 U-523 U-524
Preceded by: Type IXB Followed by: Type IXC/40
List of U-boats of Germany

v t e Shipwrecks and maritime incidents in March 1942
Shipwrecks	1 Mar: USS Edsall, HMS Encounter, HNLMS Evertsen, HMS Exeter, USS Houston, USS Pecos, HMAS Perth, USS Pope, Rooseboom, U-656 2 Mar: HNLMS Banckert, USAT Don Esteban, Ha-13, HNLMS K X, HNLMS K XIII, HNLMS K XVIII, HNLMS Koning der Nederlanden, USS Pillsbury, USS Stewart, Toendjoek, Van Waerwijck, HNLMS Witte de With 3 Mar: USS Asheville, Koolama, SS Mary, USS Perch 4 Mar: HMAS Yarra 5 Mar: Auby 6 Mar: HNLMS Pieter de Bitter, Rononia 7 Mar: Arabutan, HNLMS Gouden Leeuw, Nyggjaberg, Uniwaleco 8 Mar: HNLMS Eland Dubois, HNLMS Jan van Amstel, Smyshlyony 10 Mar: Lady Nelson, Kongō Maru, Tenyo Maru, Yokohama Maru 11 Mar: HMS Naiad 12 Mar: Texan 13 Mar: Tama Maru No. 2, Tolten 14 Mar: U-133 15 Mar: U-503, HMS Vortigern 17 Mar: Île de Batz, San Demetrio 18 Mar: E.M. Clark 19 Mar: Papoose 20 Mar: HMS Heythrop 21 Mar: Vamar 23 Mar: British Prudence 24 Mar: HMS Southwold, U-655 26 Mar: HMS Jaguar, HMS Legion, HMS P39 27 Mar: USS Atik, U-587, Equipoise 28 Mar: HMS Campbeltown, Raceland 29 Mar: Hertford, Z26 30 Mar: U-585 Unknown: Emilia, Panay
Other incidents	2 Mar: Ruth Kellogg, HMS Walney 4 Mar: USS Sargo, HMAS Tambar 5 Mar: Takao Maru 10 Mar: China Maru, Tama Maru No. 2 11 Mar: Komintern 15 Mar: Olean 16 Mar: Irish Willow, U-753 22 Mar: Kingston 23 Mar: USS Gato 25 Mar: Imperial Transport Unknown date: USS Drum
1941 1942 1943 February 1942 April 1942