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SM U-21 (Austria-Hungary)

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52: 506:. Due to demands by the Hungarian government, subcontracts for the class were divided between Hungarian and Austrian firms, and this politically expedient solution worsened technical problems with the design, resulting in numerous modifications and delays for the class in general. 488:. Although the Austro-Hungarian Navy was not happy with the design, which was largely obsolete, it was the only design for which plans were available and which could be begun immediately in domestic shipyards. The Austro-Hungarian Navy unenthusiastically placed orders for 525:
for surface running, and a single 160 shp (120 kW) electric motor for submerged travel. She was capable of 12 knots (22 km/h) while surfaced and 9 knots (17 km/h) while submerged. Although there is no specific notation of a range for
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safely submerged to a depth of 42 metres (138 ft). However, her nose was dented when she hit bottom on another test dive in September, necessitating more repairs. On 29 September, von Seyffertitz steered the boat from the submarine base at
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was an ocean-going submarine that displaced 173 metric tons (170 long tons) surfaced and 210 metric tons (207 long tons) submerged and was designed for a complement of 18. She was 127 feet 2 inches (38.76 m) long with a
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leaked and could not be repaired. After her 18 October return to Cattaro, she sailed for Pola, arriving on 24 October. There, she would undergo another lengthy stay in port for repairs. While
445:. The repairs kept the boat out of action until June 1918. But in July a piston in her diesel engine broke, knocking the submarine out of the rest of the war. At the end of World War I, 538:
class was based, had a range of 1,400 nautical miles (2,600 km) at 10 knots (19 km/h), surfaced, and 23 nautical miles (43 km) at 8 knots (15 km/h) submerged.
1236: 1113: 582:-class boats. During a diving trial in January 1917, the submarine was damaged when it sank too deep, requiring repairs that took place over the next seven months. 1182: 25: 1226: 1073: 1046: 1019: 1106: 1198: 474: 390: 815: 1221: 1099: 1241: 1173: 1157: 1150: 1136: 676: 672: 690: 521:
of 9 feet (2.7 m). For propulsion, she featured a single shaft, a single 450 bhp (340 kW)
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would not be a short one, they moved to bolster their U-boat fleet by seizing the plans for the Danish
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was towed to Pola, where she remained until the end of the war. She was ceded to Italy as a
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in September 1916. After suffering damage during a diving trial in January 1917,
694: 560: 493: 415: 323: 35: 963: 937: 821:(in Hungarian). Imperial and Royal Navy Association. p. 20. Archived from 636: 1083: 1056: 1029: 352: 968:
German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net
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German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net
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German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net
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coast in October 1917, but experienced the failure of the seal on her main
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1,400 nautical miles (2,600 km) at 10 knots (19 km/h) surfaced
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was just over 127 feet (39 m) long and was armed with two bow
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23 nautical miles (43 km) at 8 knots (15 km/h) submerged
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out of Pola on 1 June for Cattaro, making stops en route at
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instead had to turn back the following day when the main
400:), and was largely obsolete by the beginning of the war. 655:
was under repair, von Seyffertitz was transferred to
600:, von Seyffertitz was a first-time U-boat commander. 548:
located in the front and carried a complement of two
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was one of two boats of the class to be built at the
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and scrapped in 1920. Like all of her sister boats,
1004:Conway's All the World's Fighting Ships 1906–1921 667:Robert DĂĽrrigl was assigned the new commander of 616:, where she arrived on 1 October. On 4 October, 1068:. Annapolis, Maryland: Naval Institute Press. 1041:. Annapolis, Maryland: Naval Institute Press. 624:, but had returned to Cattaro by mid October. 596:Hugo von Seyffertitz. A 31-year-old native of 1107: 1037:Gibson, R. H.; Prendergast, Maurice (2003) . 1002:Gardiner, Robert; Gray, Randal, eds. (1985). 931: 929: 700:On 16 July, while conducting patrols off the 544:was armed with two 45 cm (17.7 in) 430:underwent seven months of repairs before her 8: 715:s diesel engine broke and DĂĽrrial put in at 372: 16:Austro-Hungarian Navy's U-20-class submarine 631:departed from Cattaro to begin their first 1114: 1100: 1092: 849: 847: 845: 843: 810: 808: 806: 804: 802: 800: 798: 772: 770: 768: 766: 764: 1237:World War I submarines of Austria-Hungary 919: 917: 898: 896: 894: 892: 890: 880: 878: 876: 788: 786: 784: 782: 762: 760: 758: 756: 754: 752: 750: 748: 746: 744: 578:on 15 August 1916, the first of the four 964:"WWI U-boat commanders: Robert DĂĽrrigl" 740: 369:Kaiserliche und Königliche Kriegsmarine 620:set out for a patrol off the coast of 20: 681:for four months in 1917. DĂĽrrial led 437:The U-boat conducted patrols off the 200:210 t (210 long tons), submerged 48: 7: 635:deployment. Slated to sail into the 210:127 ft 2 in (38.76 m) 197:173 t (170 long tons), surfaced 1039:The German Submarine War, 1914–1918 627:On 15 October, von Seyffertitz and 480:, three of which had been built at 422:began in mid 1915 and the boat was 144:Reichsfreiherr Hugo von Seyffertitz 671:on 24 March 1918. The 26-year-old 590:on 15 August under the command of 396:(three of which had been built in 14: 1199:List of Austro-Hungarian U-boats 559:and an 8 mm (0.31 in) 265:9 knots (17 km/h) submerged 262:12 knots (22 km/h) surfaced 50: 24: 987:Gibson and Prendergast, p. 279. 552:. She was also equipped with a 465:When it became apparent to the 385:was based on submarines of the 141:29 June 1916 – 24 February 1917 1066:A Naval History of World War I 603:Ten days after commissioning, 517:of 13 feet (4.0 m) and a 359:built for and operated by the 300:2 Ă— 45 cm (17.7 in) 156:Ladislaus Csicsery von Csicser 147:15 August 1917 – 24 March 1918 1: 322:1 Ă— 8 mm (0.31 in) 123:Ceded to Italy, scrapped 1920 1227:U-boats commissioned in 1917 250:, 160 shp (120 kW) 243:, 450 bhp (340 kW) 675:had served as commander of 159:28 August – 31 October 1918 1258: 731:had no wartime successes. 457:had no wartime successes. 1194: 1168: 1132: 1064:Halpern, Paul G. (1994). 173: 153:24 March – 28 August 1918 127: 43: 23: 554:66 mm (2.6 in) 449:was ceded to Italy as a 315:66 mm (2.6 in) 461:Design and construction 218:13 ft (4.0 m) 174:General characteristics 34:loads a torpedo during 856:"WWI U-boats: KUK U21" 534:class, upon which the 453:and scrapped in 1920. 373: 368: 226:9 ft (2.7 m) 1222:U-20-class submarines 1012:Naval Institute Press 962:Helgason, GuĂ°mundur. 936:Helgason, GuĂ°mundur. 854:Helgason, GuĂ°mundur. 593:Linienschiffsleutnant 467:Austro-Hungarian Navy 361:Austro-Hungarian Navy 665:Linienschiffleutnant 1242:Ships built in Pola 1008:Annapolis, Maryland 693:for repairs to the 482:Whitehead & Co. 374:K.u.K. Kriegsmarine 828:on 11 October 2021 816:"TengeralattjárĂłk" 496:on 27 March 1915. 418:. Construction on 1207: 1206: 1126:-class submarines 1075:978-0-87021-266-6 1048:978-1-59114-314-7 1021:978-0-87021-907-8 923:Gardiner, p. 341. 902:Gardiner, p. 344. 884:Gardiner, p. 354. 776:Gardiner, p. 343. 387:Royal Danish Navy 381:. The design for 331: 330: 1249: 1116: 1109: 1102: 1093: 1087: 1060: 1033: 988: 985: 979: 978: 976: 974: 959: 953: 952: 950: 948: 933: 924: 921: 912: 911:Halpern, p. 383. 909: 903: 900: 885: 882: 871: 870: 868: 866: 851: 838: 837: 835: 833: 827: 820: 812: 793: 792:Halpern, p. 382. 790: 777: 774: 714: 478:class submarines 434:in August 1917. 376: 186:-class submarine 58: 55: 54: 53: 28: 21: 1257: 1256: 1252: 1251: 1250: 1248: 1247: 1246: 1212: 1211: 1208: 1203: 1190: 1164: 1128: 1120: 1090: 1076: 1063: 1049: 1036: 1022: 1001: 997: 992: 991: 986: 982: 972: 970: 961: 960: 956: 946: 944: 935: 934: 927: 922: 915: 910: 906: 901: 888: 883: 874: 864: 862: 853: 852: 841: 831: 829: 825: 818: 814: 813: 796: 791: 780: 775: 742: 737: 712: 569: 471:First World War 463: 398:Austria-Hungary 379:First World War 304:(both in front) 57:Austria-Hungary 56: 51: 49: 39: 17: 12: 11: 5: 1255: 1253: 1245: 1244: 1239: 1234: 1229: 1224: 1214: 1213: 1205: 1204: 1202: 1201: 1195: 1192: 1191: 1189: 1188: 1179: 1169: 1166: 1165: 1163: 1162: 1155: 1148: 1141: 1133: 1130: 1129: 1121: 1119: 1118: 1111: 1104: 1096: 1089: 1088: 1074: 1061: 1047: 1034: 1020: 998: 996: 993: 990: 989: 980: 954: 925: 913: 904: 886: 872: 839: 794: 778: 739: 738: 736: 733: 725:war reparation 719:. On 25 July, 568: 567:Service career 565: 504:Pola Navy Yard 492:and her three 462: 459: 451:war reparation 329: 328: 327: 326: 320: 311: 305: 296: 292: 291: 288: 284: 283: 282: 281: 278: 273: 269: 268: 267: 266: 263: 258: 254: 253: 252: 251: 248:electric motor 244: 237: 232: 228: 227: 224: 220: 219: 216: 212: 211: 208: 204: 203: 202: 201: 198: 193: 189: 188: 180: 176: 175: 171: 170: 167: 163: 162: 161: 160: 157: 154: 151: 150:Robert DĂĽrrigl 148: 145: 142: 139: 134: 130: 129: 128:Service record 125: 124: 121: 117: 116: 115:15 August 1917 113: 109: 108: 107:15 August 1916 105: 101: 100: 97: 93: 92: 86:Pola Navy Yard 83: 79: 78: 75: 71: 70: 64: 60: 59: 46: 45: 41: 40: 29: 15: 13: 10: 9: 6: 4: 3: 2: 1254: 1243: 1240: 1238: 1235: 1233: 1230: 1228: 1225: 1223: 1220: 1219: 1217: 1210: 1200: 1197: 1196: 1193: 1187: 1185: 1181:Followed by: 1180: 1178: 1177: 1172:Preceded by: 1171: 1170: 1167: 1161: 1160: 1156: 1154: 1153: 1149: 1147: 1146: 1142: 1140: 1139: 1135: 1134: 1131: 1127: 1125: 1117: 1112: 1110: 1105: 1103: 1098: 1097: 1094: 1085: 1081: 1077: 1071: 1067: 1062: 1058: 1054: 1050: 1044: 1040: 1035: 1031: 1027: 1023: 1017: 1013: 1009: 1005: 1000: 999: 994: 984: 981: 969: 965: 958: 955: 943: 939: 932: 930: 926: 920: 918: 914: 908: 905: 899: 897: 895: 893: 891: 887: 881: 879: 877: 873: 861: 857: 850: 848: 846: 844: 840: 824: 817: 811: 809: 807: 805: 803: 801: 799: 795: 789: 787: 785: 783: 779: 773: 771: 769: 767: 765: 763: 761: 759: 757: 755: 753: 751: 749: 747: 745: 741: 734: 732: 730: 726: 722: 718: 711: 707: 703: 698: 696: 692: 688: 684: 680: 679: 674: 670: 666: 662: 660: 659: 654: 650: 649:conning tower 646: 642: 638: 634: 633:Mediterranean 630: 625: 623: 619: 615: 611: 606: 601: 599: 595: 594: 589: 585: 581: 577: 573: 566: 564: 562: 558: 555: 551: 547: 546:torpedo tubes 543: 539: 537: 533: 529: 524: 523:diesel engine 520: 516: 511: 507: 505: 501: 497: 495: 491: 487: 483: 479: 477: 472: 468: 460: 458: 456: 452: 448: 444: 440: 435: 433: 432:commissioning 429: 425: 421: 417: 413: 409: 408:torpedo tubes 405: 401: 399: 395: 393: 388: 384: 380: 377:) during the 375: 370: 366: 362: 358: 354: 351: 349: 344: 343: 338: 337: 325: 321: 319: 316: 312: 310: 306: 303: 302:torpedo tubes 299: 298: 297: 294: 293: 289: 286: 285: 279: 276: 275: 274: 271: 270: 264: 261: 260: 259: 256: 255: 249: 245: 242: 241:diesel engine 238: 235: 234: 233: 230: 229: 225: 222: 221: 217: 214: 213: 209: 206: 205: 199: 196: 195: 194: 191: 190: 187: 185: 181: 178: 177: 172: 168: 165: 164: 158: 155: 152: 149: 146: 143: 140: 137: 136: 135: 132: 131: 126: 122: 119: 118: 114: 111: 110: 106: 103: 102: 98: 95: 94: 91: 87: 84: 81: 80: 77:27 March 1915 76: 73: 72: 69: 65: 62: 61: 47: 42: 37: 33: 27: 22: 19: 1209: 1183: 1175: 1158: 1151: 1144: 1143: 1137: 1123: 1065: 1038: 1003: 995:Bibliography 983: 971:. Retrieved 967: 957: 945:. Retrieved 941: 907: 863:. Retrieved 859: 830:. Retrieved 823:the original 728: 720: 709: 699: 682: 677: 668: 664: 663: 657: 652: 647:seal on the 640: 628: 626: 617: 604: 602: 591: 588:commissioned 583: 579: 571: 570: 541: 540: 535: 531: 527: 509: 508: 499: 498: 494:sister boats 489: 475: 464: 454: 446: 436: 427: 419: 403: 402: 391: 382: 347: 341: 340: 335: 333: 332: 192:Displacement 183: 112:Commissioned 67: 31: 18: 865:29 November 695:gyrocompass 561:machine gun 416:machine gun 324:machine gun 138:Josef Holub 133:Commanders: 36:World War I 1232:1916 ships 1216:Categories 973:22 January 947:22 January 832:2 February 735:References 637:Ionian Sea 287:Complement 231:Propulsion 166:Victories: 704:coast, a 550:torpedoes 532:Havmanden 476:Havmanden 469:that the 392:Havmanden 353:submarine 309:torpedoes 236:1 Ă— shaft 96:Laid down 1174:SM  1084:28411665 1057:52924732 1030:12119866 717:Djenovic 702:Albanian 691:Novigrad 673:Galician 576:launched 557:deck gun 439:Albanian 424:launched 414:, and a 412:deck gun 318:deck gun 295:Armament 104:Launched 99:Mid 1915 622:Albania 614:Cattaro 82:Builder 74:Ordered 44:History 1082:  1072:  1055:  1045:  1028:  1018:  706:piston 610:Brioni 598:Brixen 530:, the 365:German 357:U-boat 350:-class 345:was a 207:Length 1186:class 826:(PDF) 819:(PDF) 713:' 645:hatch 519:draft 486:Fiume 443:hatch 394:class 342:U-XXI 272:Range 257:Speed 223:Draft 1184:U-27 1176:U-14 1159:U-23 1152:U-22 1145:U-21 1138:U-20 1124:U-20 1080:OCLC 1070:ISBN 1053:OCLC 1043:ISBN 1026:OCLC 1016:ISBN 975:2009 949:2009 867:2008 834:2009 729:U-21 721:U-21 710:U-21 689:and 687:Arbe 683:U-21 678:U-10 669:U-21 658:U-47 653:U-21 641:U-21 629:U-21 618:U-21 605:U-21 586:was 584:U-21 580:U-20 574:was 572:U-21 542:U-21 536:U-20 528:U-21 515:beam 510:U-21 500:U-21 490:U-21 455:U-21 447:U-21 428:U-21 420:U-21 410:, a 404:U-21 383:U-21 348:U-20 336:U-21 313:1 Ă— 246:1 Ă— 239:1 Ă— 215:Beam 184:U-20 179:Type 169:None 120:Fate 90:Pola 68:U-21 63:Name 32:U-21 708:in 612:to 484:in 389:'s 371:or 355:or 339:or 334:SM 66:SM 30:SM 1218:: 1078:. 1051:. 1024:. 1014:. 1010:: 1006:. 966:. 940:. 928:^ 916:^ 889:^ 875:^ 858:. 842:^ 797:^ 781:^ 743:^ 697:. 661:. 639:, 563:. 367:: 307:2 290:18 88:, 1115:e 1108:t 1101:v 1086:. 1059:. 1032:. 977:. 951:. 869:. 836:. 363:( 38:.

Index

SM U-21 loads a torpedo during World War I.
World War I
Pola Navy Yard
Pola
U-20-class submarine
diesel engine
electric motor
torpedo tubes
torpedoes
66 mm (2.6 in)
deck gun
machine gun
U-20-class
submarine
U-boat
Austro-Hungarian Navy
German
First World War
Royal Danish Navy
Havmanden class
Austria-Hungary
torpedo tubes
deck gun
machine gun
launched
commissioning
Albanian
hatch
war reparation
Austro-Hungarian Navy

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