German submarine U-733

History
Nazi Germany
Name	U-733
Ordered	21 November 1940
Builder	Schichau-Werke, Danzig
Yard number	1524
Laid down	13 October 1941
Launched	5 September 1942
Commissioned	14 November 1942
Decommissioned	15 May 1943
Recommissioned	15 December 1943
Fate	Sank in collision on 8 April 1943; Scuttled on 5 May 1945;
General characteristics
Class and type	Type VIIC submarine
Displacement	769 t (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	230 m (750 ft); Crush depth: 250–295 m (820–968 ft);
Complement	4 officers, 40–56 enlisted
Armament	5 × torpedo tubes (four bow, one stern); 14 × 53.3 cm (21 in) torpedoes or 26 TMA mines ; 1 × 8.8 cm (3.46 in) deck gun (220 rounds); 2 × twin 2 cm (0.79 in) C/30 anti-aircraft guns ;
Service record
Part of:	8th U-boat Flotilla ; 14 November 1942 – 11 May 1943; 21st U-boat Flotilla ; 15 December 1943 – 28 February 1945; 31st U-boat Flotilla ; 1 March – 5 May 1945;
Identification codes:	M 50 883
Commanders:	Oblt.z.S. Wilhelm von Trotha; 14 November 1942 – 11 May 1943; Oblt.z.S. Hans Hellmann; 15 December 1943 – 3 March 1945; Oblt.z.S. Ulrich Hammer; 1 April – 5 May 1945;
Operations:	None
Victories:	None

Last updated March 18, 2024

German submarine U-733 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 13 October 1941 at the Schichau-Werke yard at Danzig, launched on 5 September 1942, and commissioned on 14 November 1942 under the command of Oberleutnant zur See Wilhelm von Trotha.

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-733 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.^[1] 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 AEG GU 460/8–27 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).^[1]

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).^[1] 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-733 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.^[1]

Service history

On 8 April 1943, U-733 collided with Vorpostenboot V 313 outside Gotenhafen port and sank without fatalities. The next week, U-733 was raised and repaired in the Schichau yard. On 15 December 1943, U-733 was re-commissioned under the command of Oblt.z.S. Hans Hellmann. On 5 May 1945, U-733 transferred to Flensburg, were the U-boat was attacked by US aircraft and scuttled after receiving heavy damage.^[2]

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References

1 2 3 4 Gröner 1991, pp. 43–46.
↑ Busch & Röll 1999b, pp. 85, 358, 365.

Bibliography

Busch, Rainer; Röll, Hans-Joachim (1999a). 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 (1999b). 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. Danzig, 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.

External links

Helgason, Guðmundur. "The Type VIIC boat U-733". German U-boats of WWII - uboat.net. Retrieved 23 July 2015.

54°48′00″N9°49′00″E / 54.8000°N 9.8167°E / 54.8000; 9.8167

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[FOOTNOTEGröner199143–46-1] 1 2 3 4 Gröner 1991, pp. 43–46.

[FOOTNOTEBuschRöll1999b85,_358,_365-2] Busch & Röll 1999b, pp. 85, 358, 365.

[1]

[2]

v t e 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-1011 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

v t e Shipwrecks and maritime incidents in April 1943
Shipwrecks	1 Apr: Lubiana 2 Apr: Melbourne Star, U-124 5 Apr: U-167, U-635 6 Apr: Blitar, U-632 7 Apr: USS Aaron Ward, HMNZS Moa, Ro-34, U-644 8 Apr: USS Kanawha, U-733 9 Apr: Isonami 10 Apr: Trieste 11 Apr: HMS Beverley 14 Apr: Van Heemskerk, U-526 15 Apr: Archimede 16 Apr: HMS Pakenham 17 Apr: Naïade, U-175 18 Apr: Empire Bruce, HMS Regent 21 Apr: Flora Alberta, HMS Splendid 22 Apr: USS Grenadier 23 Apr: Patrol Boat No. 39 , U-189, U-191, U-602 24 Apr: El Estero, HMS Sahib, U-710 25 Apr: U-203 26 Apr: Limerick 27 Apr: U-174 28 Apr: Kamakura Maru 29 Apr: U-332, Wollongbar 30 Apr: Leone Pancaldo, U-227 Unknown date: USS Pickerel, U-376
Other incidents	2 Apr: I-16, I-20 4 Apr: Dover Hill 11 Apr: USS Albatross 20 Apr: Aréthuse 30 Apr: Hermes
1942 1943 1944 March 1943 May 1943

v t e Shipwrecks and maritime incidents in May 1945
Shipwrecks	1 May: Argo , TA 43 , U-3006 , U-3009 2 May: Admiral Hipper , USS Thornton, U-8 , U-14 , U-60 , U-61 , U-62 , U-71 , U-72 , U-120 , U-121 , U-137 , U-139 , U-140 , U-141 , U-142 , U-146 , U-148 , U-151 , U-152 , U-316 , U-552 , U-554 , U-612 , U-717 , U-929 , U-1007 , U-1308 , U-2327 , U-2359 , U-2510 , U-2526 , U-2527 , U-2528 , U-2531 , U-3002 , U-3016 , U-3018 , U-3019 , U-3020 , U-3021 , U-3504 , U-3516 , U-3517 , U-3521 , U-3522 3 May: Arcona, Cap Arcona, Deutschland, Emden , USS Lagarto, USS Little, USS LSM(R)-195, Medusa, Nordland , Schlesien , Thielbek, UA , UB , UD-1 , UD-2 , UD-3 , UD-4 , U-48 , U-52 , U-57 , U-58 , U-59 , U-101 , U-328 , U-339 , U-428 , U-446 , U-475 , U-560 , U-704 , U-708 , U-747 , U-748 , U-795 , U-822 , U-828 , U-876 , U-903 , U-922 , U-924 , U-958 , U-1166, U-1170 , U-1192 , U-1196 , U-1201 , U-1205 , U-1210 , U-1227 , U-1275 , U-2330 , U-2332 , U-2355 , U-2371 , U-2501 , U-2503 , U-2504 , U-2508 , U-2512 , U-2519 , U-2520 , U-2521 , U-2524 , U-2533 , U-2534 , U-2535 , U-2536 , U-2539 , U-2543 , U-2545 , U-2546 , U-2548 , U-2552 , U-3001 , U-3005 , U-3010 , U-3011 , U-3012 , U-3013 , U-3014 , U-3023 , U-3024 , U-3025 , U-3026 , U-3027 , U-3028 , U-3029 , U-3031 , U-3032 , U-3037 , U-3038 , U-3039 , U-3040 , U-3507 , U-3509 , U-3511 , U-3513 , U-3518 , U-3525 , U-3530 , U-4705 , U-4712 , Z43 4 May: USS LSM(R)-190, USS LSM(R)-194, USS Luce, USS Morrison, Orion , USS PGM-17, U-30 , U-46 , U-267 , U-393 , U-711 , U-721 , U-792 , U-793 , U-904 , U-1132 , U-1161 , U-1168 , U-1303 , U-1304 , U-2338 , U-2540 , U-3033 , U-3034 , U-4709 , U-4711 5 May: T36 , U-17 , U-38 , U-236 , U-290 , U-349 , U-351 , U-370 , U-397 , U-534 , U-579 , U-733 , U-746 , U-750 , U-794 , U-827 , U-999 , U-1008 , U-1016 , U-1025 , U-1056 , U-1162 , U-1193 , U-1204 , U-1207 , U-1223 , U-1234 , U-1306 , U-1405 , U-2333 , U-2339 , U-2343 , U-2346 , U-2347 , U-2349 , U-2352 , U-2357 , U-2358 , U-2360 , U-2362 , U-2364 , U-2366 , U-2367 , U-2368 , U-2369 , U-2507 , U-2517 , U-2522 , U-2525 , U-2541 , U-2544 , U-2551 , U-3015 , U-3022 , U-3044 , U-3501 , U-3510 , U-3524 , U-3526 , U-3527 , U-3528 , U-3529 , U-4701 , U-4702 , U-4703 , U-4704 , U-4707 , U-4710 6 May: U-853 , U-881 , U-3523 7 May: Avondale Park, Sneland I, U-1407 8 May: U-37 , U-320 , U-382 , U-2365 , U-2538 , U-3030 , U-3503 16 May: Haguro , Hatsutaka , U-287 18 May: USS Longshaw 20 May: U-963 24 May: HM Motor Gun Boat 2007, U-979 25 May: USS Bates, USS LSM-135 28 May: USS Drexler 29 May: Tenryo Maru 31 May: I-361, Uzbekistan
Other incidents	3 May: USS Aaron Ward 4 May: HMS Formidable, USS Sangamon 9 May: USS England, USS Oberrender 11 May: USS Bunker Hill, USS Evans, USS Hugh W. Hadley 19 May: Kashima, HMS Terrapin 20 May: USS Chase, USS Thatcher 25 May: USS Barry, USS Spectacle, William B. Allison 26 May: USS PC-1603 29 May: USS Shubrick 31 May: Hebrides Unknown date: Nymphe, U-1197
1944 1945 1946 April 1945 June 1945

History

Nazi Germany
Name	U-733
Ordered	21 November 1940
Builder	Schichau-Werke, Danzig
Yard number	1524
Laid down	13 October 1941
Launched	5 September 1942
Commissioned	14 November 1942
Decommissioned	15 May 1943
Recommissioned	15 December 1943
Fate	Sank in collision on 8 April 1943 Scuttled on 5 May 1945
General characteristics
Class and type	Type VIIC submarine
Displacement	769 t (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	230 m (750 ft) Crush depth: 250–295 m (820–968 ft)
Complement	4 officers, 40–56 enlisted
Armament	5 × torpedo tubes (four bow, one stern) 14 × 53.3 cm (21 in) torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun (220 rounds) 2 × twin 2 cm (0.79 in) C/30 anti-aircraft guns
Service record
Part of:	8th U-boat Flotilla 14 November 1942 – 11 May 1943 21st U-boat Flotilla 15 December 1943 – 28 February 1945 31st U-boat Flotilla 1 March – 5 May 1945
Identification codes:	M 50 883
Commanders:	Oblt.z.S. Wilhelm von Trotha 14 November 1942 – 11 May 1943 Oblt.z.S. Hans Hellmann 15 December 1943 – 3 March 1945 Oblt.z.S. Ulrich Hammer 1 April – 5 May 1945
Operations:	None
Victories:	None