German submarine U-1221

History
Nazi Germany
Name	U-1221
Ordered	25 August 1941
Builder	Deutsche Werft AG, Hamburg
Yard number	384
Laid down	28 October 1942
Launched	26 May 1943
Commissioned	11 August 1943
Fate	Sunk in Kiel harbour on 3 April 1945
General characteristics
Class and type	Type IXC/40 submarine
Displacement	1,144 t (1,126 long tons) surfaced; 1,257 t (1,237 long tons) submerged;
Length	76.76 m (251 ft 10 in) o/a ; 58.75 m (192 ft 9 in) pressure hull ;
Beam	6.86 m (22 ft 6 in) o/a; 4.44 m (14 ft 7 in) pressure hull;
Height	9.60 m (31 ft 6 in)
Draught	4.67 m (15 ft 4 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	18.3 knots (33.9 km/h; 21.1 mph) surfaced; 7.3 knots (13.5 km/h; 8.4 mph) submerged;
Range	13,850 nmi (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph) surfaced; 63 nmi (117 km; 72 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 × 53.3 cm (21 in) torpedo tubes (4 bow, 2 stern); 22 × 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:	4th U-boat Flotilla ; 11 August 1943 – 30 June 1944; 10th U-boat Flotilla ; 1 July – 30 November 1944; 33rd U-boat Flotilla ; 1 December 1944 – 3 April 1945;
Identification codes:	M 55 188
Commanders:	Oblt.z.S. Karl Kölzer; 11 August 1943 – 19 January 1944; Oblt.z.S. Paul Ackermann; 20 January 1944 – 3 April 1945;
Operations:	1 patrol:; a. 20 August – 28 November 1944; b. 1 – 5 December 1944;
Victories:	None

Last updated April 05, 2024

German submarine U-1221 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.

Design

German Type IXC/40 submarines were slightly larger than the original Type IXCs. U-1221 had a displacement of 1,144 tonnes (1,126 long tons) when at the surface and 1,257 tonnes (1,237 long tons) while submerged.^[1] 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 6.86 m (22 ft 6 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.67 m (15 ft 4 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).^[1]

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).^[1] 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 13,850 nautical miles (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph). U-1221 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.^[1]

Service history

U-1221 was ordered on 25 August 1941 from Deutsche Werft, AG in Hamburg under the yard number 384. Her keel was laid down on 28 October 1942 and the U-boat was launched the following year on 26 May 1943. She was commissioned into service under the command of Oberleutnant zur See Karl Kölzer (Crew 31) in the 4th U-boat Flotilla on 11 August 1943.

On 20 January 1944, Kölzer handed over command to Oberleutnant zur See Paul Ackermann (Crew XII/39), who took her on her first - and only - patrol in the West Atlantic from 20 August until 28 November 1944.

During an air raid by Eighth Air Force on Kiel, U-1221 was hit by two bombs in the fore-ship on 3 April 1945. The U-boat sank immediately, taking the skeleton crew of 18 with her. Seven of her crew perished, while the rest was rescued through the stern torpedo tubes the next day.^[2]

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References

1 2 3 4 Gröner 1991, p. 68.
↑ Busch & Röll 1999, pp. 331.

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). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

54°20′N10°10′E / 54.333°N 10.167°E / 54.333; 10.167

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[FOOTNOTEGröner199168-1] 1 2 3 4 Gröner 1991, p. 68.

[FOOTNOTEBuschRöll1999331-2] Busch & Röll 1999, pp. 331.

[1]

[2]

v t e German Type IXC/40 submarines
U-167 U-168 U-169 U-170 U-183 U-184 U-185 U-186 U-187 U-188 U-189 U-190 U-191 U-192 U-193 U-194 U-525 U-526 U-527 U-528 U-529 U-530 U-531 U-532 U-533 U-534 U-535 U-536 U-537 U-538 U-539 U-540 U-541 U-542 U-543 U-544 U-545 U-546 U-547 U-548 U-549 U-550 U-801 U-802 U-803 U-804 U-805 U-806 U-841 U-842 U-843 U-844 U-845 U-846 U-853 U-854 U-855 U-856 U-857 U-858 U-865 U-866 U-867 U-868 U-869 U-870 U-877 U-878 U-879 U-880 U-881 U-889 U-1221 U-1222 U-1223 U-1224 U-1225 U-1226 U-1227 U-1228 U-1229 U-1230 U-1231 U-1232 U-1233 U-1234 U-1235
Preceded by: Type IXC Followed by: Type IXD
List of U-boats of Germany

v t e Shipwrecks and maritime incidents in April 1945
Shipwrecks	1 Apr: Awa Maru 2 Apr: CD-186, USS Dickerson, U-321 3 Apr: Brummer , USS S-16, U-1221 , U-2542 , U-3505 , T111 4 Apr: USS Dickerson, U-237 , U-749 , U-3003 5 Apr: U-242 , USS S-17 6 Apr: Amatsukaze , USS Bush, USS Colhoun, USS Leutze, USS Morris, USS Newcomb, USS Witter, SS Hobbs Victory , SS Logan Victory 7 Apr: Asashimo , Hamakaze , Isokaze , Isuzu , Kasumi , USS LST-447, Oldenburg , USS PGM-18, U-1195 , Yahagi , Yamato 8 Apr: U-774 , U-1001 9 Apr: Admiral Scheer , Ro-56, U-677 , U-747 , U-804 , U-843 , U-982 , U-1065 , U-2509 , U-2514 , U-3512 , U-2516 10 Apr: U-878 , Weser 12 Apr: USS Mannert L. Abele, Ro-64, U-486 13 Apr: Karlsruhe, U-1024 14 Apr: Belgian Airman, U-235 , U-1206 15 Apr: U-103 , U-285 , U-1063 , U-1235 16 Apr: HMCS Esquimalt, Lützow , USS Pringle, U-78 , U-880 , U-1274 17 Apr: Goya 19 Apr: Aquila, U-251 , U-548 , U-879 21 Apr: U-636 22 Apr: USS Swallow, U-518 23 Apr: USS Eagle Boat 56, U-183 24 Apr: USS Frederick C. Davis, U-108 , U-546 25 Apr: Graf Zeppelin , Ro-109, TA 32 , U-326 27 Apr: Canada Victory , TA 34 28 Apr: CH-17 , U-56 29 Apr: I-44, U-56 , U-286 , U-307 , U-1017 30 Apr: HMS Goodall, TA 43 , U-879 , U-1107 Unknown date: I-56, Ro-46, Ro-49, USS Snook, U-246 , U-325 , U-396 , U-398 , U-548 , U-857 , U-1055
Other incidents	2 Apr: USS Dickerson 5 Apr: USS Thornton 6 Apr: USS Defense, USS Emmons, USS Mullany, USS Rodman 8 Apr: USS Bullhead 9 Apr: USS Sea Devil 11 Apr: I-401 12 Apr: USS Lindsey, U-1024 . USS Zellars 14 Apr: USS Sigsbee 15 Apr: HMS Ekins, USS Laffey 16 Apr: USS Bryant, Goya, USS Harding 19 Apr: USS Bullhead, USS Pogy,USS Tolman 27 Apr: HMS Redmill 28 Apr: Argo, USS Huron 29 Apr: USS Baya 30 Apr: U-3525
1944 1945 1946 March 1945 May 1945

History

Nazi Germany
Name	U-1221
Ordered	25 August 1941
Builder	Deutsche Werft AG, Hamburg
Yard number	384
Laid down	28 October 1942
Launched	26 May 1943
Commissioned	11 August 1943
Fate	Sunk in Kiel harbour on 3 April 1945
General characteristics
Class and type	Type IXC/40 submarine
Displacement	1,144 t (1,126 long tons) surfaced 1,257 t (1,237 long tons) submerged
Length	76.76 m (251 ft 10 in) o/a 58.75 m (192 ft 9 in) pressure hull
Beam	6.86 m (22 ft 6 in) o/a 4.44 m (14 ft 7 in) pressure hull
Height	9.60 m (31 ft 6 in)
Draught	4.67 m (15 ft 4 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	18.3 knots (33.9 km/h; 21.1 mph) surfaced 7.3 knots (13.5 km/h; 8.4 mph) submerged
Range	13,850 nmi (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph) surfaced 63 nmi (117 km; 72 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 × 53.3 cm (21 in) torpedo tubes (4 bow, 2 stern) 22 × 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:	4th U-boat Flotilla 11 August 1943 – 30 June 1944 10th U-boat Flotilla 1 July – 30 November 1944 33rd U-boat Flotilla 1 December 1944 – 3 April 1945
Identification codes:	M 55 188
Commanders:	Oblt.z.S. Karl Kölzer 11 August 1943 – 19 January 1944 Oblt.z.S. Paul Ackermann 20 January 1944 – 3 April 1945
Operations:	1 patrol: a. 20 August – 28 November 1944 b. 1 – 5 December 1944
Victories:	None