German submarine U-921

History
U-570 Type VIIC submarine that was captured by the British in 1941. This U-boat is almost identical to U-921.
Nazi Germany
Name:	U-921
Ordered:	6 June 1941
Builder:	Neptun Werft AG, Rostock
Yard number:	508
Laid down:	15 October 1941
Launched:	3 April 1943
Commissioned:	30 May 1943
Fate:	Missing since 24 September 1944
General characteristics
Class and type:	Type VIIC submarine
Displacement:	769 tonnes (757 long tons) surfaced 871 t (857 long tons) submerged
Length:	67.10 m (220 ft 2 in) o/a 50.50 m (165 ft 8 in) pressure hull
Beam:	6.20 m (20 ft 4 in) o/a 4.70 m (15 ft 5 in) pressure hull
Height:	9.60 m (31 ft 6 in)
Draught:	4.74 m (15 ft 7 in)
Installed power:	2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels) 750 PS (550 kW; 740 shp) (electric)
Propulsion:	2 shafts 2 × diesel engines 2 × electric motors
Speed:	17.7 knots (32.8 km/h; 20.4 mph) surfaced 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range:	8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth:	220 m (720 ft) Crush depth: 250–295 m (820–968 ft)
Complement:	4 officers, 44–52 enlisted
Armament:	5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern) 14 × torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun (220 rounds) various AA guns
Service record
Part of:	8th U-boat Flotilla (Training) 30 May 1943 – 31 May 1944 13th U-boat Flotilla (Active service) 1 June 1944 – 24 September 1944
Commanders:	Oblt.z.S. Wolfgang Leu^[1] 30 May 1943 – 24 May 1944 Oblt.z.S. Hans-Joachim Neumann^[2] 24 May 1944 – 31 May 1944 Oblt.z.S. Alfred Werner^[3] 1 June 1944 – 24 September 1945
Operations:	2 patrols
Victories:	None

German submarine U-921 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.

She was ordered on 6 June 1941, and was laid down on 1 April 1943 at Neptun Werft AG, Rostock, as yard number 508. She was launched on 3 April 1943 and commissioned under the command of Oberleutnant zur See Wolfgang Leu on 30 May 1943.^[4]

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-921 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.^[5] She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two SSW GU 343/38-8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).^[5]

The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph).^[5] When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-921 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes or 26 TMA mines, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and an anti-aircraft gun. The boat had a complement of between 44 — 52 men.^[5]

Service history

On 24 May 1944, only seven days after being commissioned, U-921 was spotted off Norway, enroute to Narvik, by a Canadian Sunderland, DV990, of 422/R Squadron RCAF piloted by F/O G.E. Holley. U-921 had been searching for U-476 which had been attack from the air earlier in the day and badly damaged. U-921 was able to hit the Sunderland on its attack run causing it to crash into the sea after dropping three depth charges, which resaulted in no damage to U-921 but all the crewmen of the Sunderland were lost.^[4]

Shortly after this first attack U-921 was sighted by another Canadian Sunderland, DW111, of 423/S Squadron RCAF piloted by F/L R.H. Nesbitt. U-921 was able to avoid the five depth charges dropped by the Sunderland but strafing wounded the commander, Oblt.z.S. Wolfgang Leu, and two other crewmen. As U-921 was diving, Leu was able to get both of the wounded crewmen below, but then closed to hatch to prevent her from sinking, sacrificing himself. U-921 sailed for Trondheim, arriving 26 May 1944, under command of her I. WO (1st Wachoffizier) Korvettenkapitän Heinz-Joachim Neumann. ^[4]

On 24 September 1944, 20 days into her second war patrol, U-921 sent her last radio transmission from 74°45′N 13°50′E / 74.750°N 13.833°E / 74.750; 13.833Coordinates: 74°45′N 13°50′E / 74.750°N 13.833°E / 74.750; 13.833, west of Bear Island in the Norwegian Sea, in which she stated that, due to unspecified damage, she needed to return to port. U-921 was ordered to continue to operate against Convoy RA 60 and postpone her return. On 2 October 1944 she was listed as missing when, after the end of the convoy battle, she failed to return to Narvik.^[4]

Wolfpacks

U-921 took part in one wolfpack, namely.^[4]

Grimm (9 September 1944 — 2 October 1944)

References

↑ Helgason, Guðmundur. "Wolfgang Leu". German U-boats of WWII - uboat.net. Retrieved 5 April 2016.
↑ Helgason, Guðmundur. "Hans-Joachim Neumann". German U-boats of WWII - uboat.net. Retrieved 5 April 2016.
↑ Helgason, Guðmundur. "Alfred Werner". German U-boats of WWII - uboat.net. Retrieved 5 April 2016.
1 2 3 4 5 Helgason, Guðmundur. "U-921". German U-boats of WWII - uboat.net. Retrieved 5 April 2016.
1 2 3 4 Gröner 1991, pp. 43-46.

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). 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. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

External links

Helgason, Guðmundur. "Patrols by U-921". German U-boats of WWII - uboat.net.

German Type VII submarines

Type VIIA	U-27 U-28 U-29 U-30 U-31 U-32 U-33 U-34 U-35 U-36

Type VIIB	U-45 U-46 U-47 U-48 U-49 U-50 U-51 U-52 U-53 U-54 U-55 U-73 U-74 U-75 U-76 U-83 U-84 U-85 U-86 U-87 U-99 U-100 U-101 U-102

Type VIIC	U-69 U-70 U-71 U-72 U-77 U-78 U-79 U-80 U-81 U-82 U-88 U-89 U-90 U-91 U-92 U-93 U-94 U-95 U-96 U-97 U-98 U-132 U-133 U-134 U-135 U-136 U-201 U-202 U-203 U-204 U-205 U-206 U-207 U-208 U-209 U-210 U-211 U-212 U-221 U-222 U-223 U-224 U-225 U-226 U-227 U-228 U-229 U-230 U-231 U-232 U-235 U-236 U-237 U-238 U-239 U-240 U-241 U-242 U-243 U-244 U-245 U-246 U-247 U-248 U-249 U-250 U-251 U-252 U-253 U-254 U-255 U-256 U-257 U-258 U-259 U-260 U-261 U-262 U-263 U-264 U-265 U-266 U-267 U-268 U-269 U-270 U-271 U-272 U-273 U-274 U-275 U-276 U-277 U-278 U-279 U-280 U-281 U-282 U-283 U-284 U-285 U-286 U-287 U-288 U-289 U-290 U-291 U-301 U-302 U-303 U-304 U-305 U-306 U-307 U-308 U-309 U-310 U-311 U-312 U-313 U-314 U-315 U-316 U-331 U-332 U-333 U-334 U-335 U-336 U-337 U-338 U-339 U-340 U-341 U-342 U-343 U-344 U-345 U-346 U-347 U-348 U-349 U-350 U-351 U-352 U-353 U-354 U-355 U-356 U-357 U-358 U-359 U-360 U-361 U-362 U-363 U-364 U-365 U-366 U-367 U-368 U-369 U-370 U-371 U-372 U-373 U-374 U-375 U-376 U-377 U-378 U-379 U-380 U-381 U-382 U-383 U-384 U-385 U-386 U-387 U-388 U-389 U-390 U-391 U-392 U-393 U-394 U-396 U-397 U-398 U-399 U-400 U-401 U-402 U-403 U-404 U-405 U-406 U-407 U-408 U-409 U-410 U-411 U-412 U-413 U-414 U-415 U-416 U-417 U-418 U-419 U-420 U-421 U-422 U-423 U-424 U-425 U-426 U-427 U-428 U-429 U-430 U-431 U-432 U-433 U-434 U-435 U-436 U-437 U-438 U-439 U-440 U-441 U-442 U-443 U-444 U-445 U-446 U-447 U-448 U-449 U-450 U-451 U-452 U-453 U-454 U-455 U-456 U-457 U-458 U-465 U-466 U-467 U-468 U-469 U-470 U-471 U-472 U-473 U-475 U-476 U-477 U-478 U-479 U-480 U-481 U-482 U-483 U-484 U-485 U-486 U-551 U-552 U-553 U-554 U-555 U-556 U-557 U-558 U-559 U-560 U-561 U-562 U-563 U-564 U-565 U-566 U-567 U-568 U-569 U-570 U-571 U-572 U-573 U-574 U-575 U-576 U-577 U-578 U-579 U-580 U-581 U-582 U-583 U-584 U-585 U-586 U-587 U-588 U-589 U-590 U-591 U-592 U-593 U-594 U-595 U-596 U-597 U-598 U-599 U-600 U-601 U-602 U-603 U-604 U-605 U-606 U-607 U-608 U-609 U-610 U-611 U-612 U-613 U-614 U-615 U-616 U-617 U-618 U-619 U-620 U-621 U-622 U-623 U-624 U-625 U-626 U-627 U-628 U-629 U-630 U-631 U-632 U-633 U-634 U-635 U-636 U-637 U-638 U-639 U-640 U-641 U-642 U-643 U-644 U-645 U-646 U-647 U-648 U-649 U-650 U-651 U-652 U-653 U-654 U-655 U-656 U-657 U-658 U-659 U-660 U-661 U-662 U-663 U-664 U-665 U-666 U-667 U-668 U-669 U-670 U-671 U-672 U-673 U-674 U-675 U-676 U-677 U-678 U-679 U-680 U-681 U-682 U-683 U-701 U-702 U-703 U-704 U-705 U-706 U-707 U-708 U-709 U-710 U-711 U-712 U-713 U-714 U-715 U-716 U-717 U-718 U-719 U-720 U-721 U-722 U-731 U-732 U-733 U-734 U-735 U-736 U-737 U-738 U-739 U-740 U-741 U-742 U-743 U-744 U-745 U-746 U-747 U-748 U-749 U-750 U-751 U-752 U-753 U-754 U-755 U-756 U-757 U-758 U-759 U-760 U-761 U-762 U-763 U-764 U-765 U-766 U-767 U-768 U-771 U-772 U-773 U-774 U-775 U-776 U-777 U-778 U-779 U-821 U-822 U-825 U-826 U-901 U-903 U-904 U-905 U-907 U-921 U-922 U-923 U-924 U-925 U-926 U-927 U-928 U-951 U-952 U-953 U-954 U-955 U-956 U-957 U-958 U-959 U-960 U-961 U-962 U-963 U-964 U-965 U-966 U-967 U-968 U-969 U-970 U-971 U-972 U-973 U-974 U-975 U-976 U-977 U-978 U-979 U-980 U-981 U-982 U-983 U-984 U-985 U-986 U-987 U-988 U-989 U-990 U-991 U-992 U-993 U-994 U-1051 U-1052 U-1053 U-1054 U-1055 U-1056 U-1057 U-1058 U-1101 U-1102 U-1131 U-1132 U-1161 U-1162 U-1191 U-1192 U-1193 U-1194 U-1195 U-1196 U-1197 U-1198 U-1199 U-1200 U-1201 U-1202 U-1203 U-1204 U-1205 U-1206 U-1207 U-1208 U-1209 U-1210

Type VIIC/41	U-292 U-293 U-294 U-295 U-296 U-297 U-298 U-299 U-300 U-317 U-318 U-319 U-320 U-321 U-322 U-323 U-324 U-325 U-326 U-327 U-328 U-691 U-827 U-828 U-929 U-930 U-995 U-997 U-998 U-999 U-1000 U-1001 U-1002 U-1003 U-1004 U-1005 U-1006 U-1007 U-1008 U-1009 U-1010 U-1013 U-1014 U-1015 U-1016 U-1017 U-1018 U-1019 U-1020 U-1021 U-1022 U-1023 U-1024 U-1025 U-1063 U-1064 U-1065 U-1103 U-1104 U-1105 U-1106 U-1107 U-1108 U-1109 U-1110 U-1163 U-1164 U-1165 U-1166 U-1167 U-1168 U-1169 U-1170 U-1171 U-1172 U-1271 U-1272 U-1273 U-1274 U-1275 U-1276 U-1277 U-1278 U-1279 U-1301 U-1302 U-1303 U-1304 U-1305 U-1306 U-1307 U-1308

Type VIID	U-213 U-214 U-215 U-216 U-217 U-218

Type VIIF	U-1059 U-1060 U-1061 U-1062

Preceded by: Type II Followed by: Type IX List of U-boats of Germany

Shipwrecks and maritime incidents in September 1944

Shipwrecks	1 Sep: HMS Hurst Castle, Kehdingen, U-247 2 Sep: Empire Curzon, U-394 5 Sep: U-362 7 Sep: Shin'yō Maru, (incident), Westfalen 8 Sep: Rex 9 Sep: Sava, U-484 10 Sep: U-20, U-23 11 Sep: Giulio Cesare, U-19 12 Sep: USS Noa, Rakuyō Maru, Shikinami 13 Sep: USS Perry, USS Warrington 14 Sep: Irene Oldendorff 17 Sep: Un'yō 18 Sep: Gyōkū Maru, Jun'yō Maru 19 Sep: Isoshima;U-407, U-867 21 Sep: China Maru, Hōfuku Maru, Katsuriki, Satsuki 22 Sep: Drache 23 Sep: Taranto, U-859 24 Sep: Akitsushima, Siberia Maru, T-120, Yaeyama 25 Sep: USS Miantonomah 26 Sep: Aotaka, Saga, U-871 27 Sep: HMS Rockingham, Ural Maru 28 Sep: Dragoner 29 Sep: U-863 30 Sep: U-565, U-596, U-1062 Unknown date: U-703, U-855, U-865, U-921

Other incidents	12 Sep: USS Fullam 14 Sep: USS Natchez, USS Temptress 15 Sep: Tirpitz 19 Sep: Jingei, U-565 24 Sep: U-565, U-596 26 Sep: Don Marquis Unknown date: Schwabenland

1943 1944 1945 August 1944 October 1944

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