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Coastal motor boat

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189: 479: 654: 858:'s Experimental Works at Feltham adapted their radio control system, enabling two DCB craft to be controlled from one aircraft and proving in the 1918 trials that a flotilla of up to eight DCBs could be controlled in close formation. At the conclusion of extensive post war trials CMB9/DCB1 was converted back to her original condition, remaining in service until 1950. She has been restored in her role as CMB9 and is based at 41: 849:
in 1917, the first CMB so converted and in so doing became DCB1. The DCB role was and still is in part classified, completely autonomous, unmanned and radio controlled via aircraft, therefore can considered to be the first autonomous drone vessel. Following the success of the Royal Flying Corps drone
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firing pistol and a long steel ram, entering the water tail-first. A trip-wire between the torpedo and the ram head would start the torpedo motors once pulled taut during release. The CMB would then turn hard over and get out of its path. There is no record of a CMB ever being hit by its own torpedo,
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produced an enlarged 60-foot (18 m) overall version. This allowed a heavier payload, and now two torpedoes could be carried. A mixed warload of a single torpedo and four depth charges could also be carried, the depth charges released from individual cradles over the sides, rather than a stern
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These boats were expected to have a high speed, making use of the lightweight and powerful petrol engines then available. The speed of the boat when fully loaded was to be at least 30 knots (56 km/h) and sufficient fuel was to be carried to give a considerable radius of action.
128:, who had experience in small fast boats, though nearly half were built by eight other boat builders under subcontract. The boat builders were Tom Bunn of Rotherhithe, Taylor & Bates of Chertsey, Camper & Nicholson of Gosport, Wills & Packham of Sittingbourne, 661:
Twelve 72 ft long CMBs were ordered in early 1918 for minelaying (7 magnetic mines) or torpedo work (6 torpedoes). Five were cancelled; of the remainder, 3 survived the Second World War, with CMB 103 MT, built by Camper and Nicholsons in 1920, preserved as a
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Speeds from 35–41 knots (40–47 mph; 65–76 km/h) were possible, depending on the various petrol engines fitted. At least two unexplained losses due to fires in port are thought to have been caused by a build-up of petrol vapour igniting.
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was accepted by the Admiralty for trials. A number of these boats were built and had a distinguished service history, but in hindsight they were considered to be too small to be ideal, particularly in how their payload was limited to a single
881:(BMPT) at Marchwood, is the sole surviving 55-foot CMB. Built in 1941, the penultimate 55-foot built, her design was based on that of the CMBs of 1917 with two V12 engines. Her post-war history is incomplete, but she was registered as the 316:
Several companies were approached, but only Thornycroft considered it possible to meet such a requirement. In January 1916, twelve boats were ordered, all of which were completed by August 1916. Further boats were built, to a total of 39.
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The hull of the other remaining example, CMB9, is identical to that of CMB4, for many years thought to be the sole survivor of the type. Her crew consisted of Archibald Dayrell Reed and Lieutenant Harold Drew. CMB 9 was converted to a
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supported with aircraft managed to damage one battleship and sink a depot ship. There were casualties as the mission came under heavy fire. For piloting the boats there Lt. Agar was awarded a
719:. Coastal Motor Boats were initially used for secret duties to move agents in and out of Russia from a base in Finland. But in June 1919, the commander of the force, Lieutenant 893:. She was acquired by the Council around 1990. Some restoration after this was carried out at Priddy's Hard, then she was transported by road to BMPT Marchwood in March 2000. 1097: 846: 1500: 699: 140:
of Lowestoft. Engines were not proper maritime internal combustion engines (as these were in short supply) but adapted aircraft engines from firms such as
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gave tentative approval to the idea and, in the summer of 1915, produced a Staff Requirement requesting designs for a Coastal Motor Boat for service in the
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but in one instance the firing pistol was triggered prematurely and the crew had a tense 20 minutes close to the enemy whilst reloading it.
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that small motor boats carrying a torpedo might be capable of travelling over the protective minefields and attacking ships of the
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Operation Kronstadt: The True Story of Honor, Espionage, and the Rescue of Britain's Greatest Spy, the Man with a Hundred Faces
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and operated on the Belgian coast. On 7 April 1917, the 3rd CMB Division attacked a group of German destroyers anchored at
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on 23 April 1918 to block the port, Coastal Motor Boats and Motor Launches were fitted out to deploy a smoke screen.
1490: 83: 178:, Tom Bunn, Taylor & Bates, Camper and Nicholsons, J W Brooke, Frank Maynard, Salter Bros, Wills & Packham 786: 141: 1427: 764: 295: 1495: 867: 806: 757: 695: 687: 310: 114: 753: 301:
powered by a 120 hp (89 kW) Thornycroft petrol engine and could reach 35 knots (65 km/h).
1355: 749: 478: 1132: 826: 729: 694:. As a result, one destroyer was sunk and one very seriously damaged. For these actions Beckett was 79: 45: 32: 1322: 1302: 1282: 838: 1384: 1327: 1307: 1287: 968: 133: 1147: 1109: 1008: 145: 1029: 117:, was to not exceed the weight of the 30-foot (9.1 m) long motor boat then carried in the 1262: 1195: 1078: 741: 298: 683: 667: 129: 863: 653: 324:, but instead was carried in a rear-facing trough. On firing it was pushed backwards by a 1356:"Capabilities of distantly controlled boats. Reports of trials at Dover 28 - 31 May 1918" 818: 734: 706: 483: 1173: 1148:"31189: 18 February 1919, Zeebrugge and Ostend Raids, Naval Despatch dated 9 May 1918" 40: 1484: 855: 720: 137: 75: 1475: 942: 756:(Flotilla commander in the 55-ft Coastal Motor Boat 31) received Victoria Crosses. 642: 321: 262: 102: 17: 109:. Secondary armament would have been provided by light machine guns, such as the 829:. When these works closed it was restored and can now be seen in Boathouse 4 at 785:) to join a British naval unit supporting the anti-Bolshevik governments of the 770: 663: 604:
Twin screws & twin 650 hp (480 kW) Thornycroft RY12 petrol engines
71: 64: 28: 886: 266: 194: 106: 60: 1217:"The Hornets of Sea: The World War One Coastal Motor Boats of the Royal Navy" 1413: 874: 859: 810: 778: 760:(captain of CMB31), Edward Bodley (CMB 72) and Francis Yates received DSOs. 724: 691: 258: 110: 87: 27:
This article is about WWI British Royal Navy boats. For coastal patrol, see
1410:"The Preservation of Thornycroft Coastal Motor Boat 331 at Fort Gilkicker" 727:. Agar, in Coastal Motor Boat 4, entered the harbour and sank the cruiser 921:
British "18 inch" torpedoes were 17.72 in (45.0 cm) in diameter
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Mahogany plank on frame construction, single-step planing round-form hull
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citing "British Vessels Lost at Sea, 1914-1918", published by HMSO, 1919
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Barrie Griffin (April 2008). "The Thornycroft 55' Coastal Motor Boat".
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The restriction on weight meant the torpedo could not be fired from a
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In December 1916, the 3rd Coastal Motor Boat Division proceeded to
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750–900 hp (560–670 kW) total power depending on engines
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had designed and built a 25 ft (7.6 m) speedboat called
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with details of these boats and the action. Agar’s VC is at the
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plank on frame construction, single-step planing round-form hull
645:. The last survivor, MTB 331, is of this group, built in 1941. 74:, following a suggestion from three junior officers of the 943:"Torpedoes of the United Kingdom/Britain Pre-World War II" 1430:. British Military Powerboat Trust (BMPT). Archived from 866:
events in Bristol. The boat is listed on the register of
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In January 1919 a force of 12 CMBs was dispatched to the
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The design was so successful that more were built during
52:. View from the stern showing the torpedo launching ramp. 1412:. Hampshire County Museums Service. 1991. Archived from 817:
was, for many years, at the Vosper Thornycroft works on
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was a small high-speed British torpedo boat used by the
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An Offensive Need: The Birth of the Coastal Motor Boat
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Larger versions of the 40-footer were ordered in 1916
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Sixteen Coastal Motor Boats were lost during the war
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in which Augustus Agar won his VC for the attack on
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Coastal Forces: Vessels of the Royal Navy from 1865
1054: 1052: 1050: 113:. The weight of a fully loaded boat, complete with 1060:Conway's All The World's Fighting Ships 1906-1921 97:They were to be armed in a variety of ways, with 1258:The Oxford Illustrated History of the Royal Navy 723:, took two CMBs in a raid on Bolshevik ships in 717:operated against Soviet Red forces in the Baltic 444:1 18" torpedo plus 4 depth charges, 4 Lewis guns 1331:(Supplement). 11 November 1919. p. 13745. 1311:(Supplement). 11 November 1919. p. 13743. 1020: 1018: 241:Single screw, various choices of petrol engine 1291:(Supplement). 21 October 1919. p. 12979. 1255:Hill, J. R.; Ranft, Bryan (17 October 2002). 1042:sinking of the Russian Cruiser 'Oleg' in 1919 8: 1341:"The Royal Navy on the Caspian, 1918–1919". 1098:Historic Warships News Sheet: December 2011 1428:"MTB 331 home site and restoration photos" 1174:"British Minor Warship Losses - 1914–1918" 620:Twin 18" torpedoes, depth charges or mines 136:of Rowhedge, Frank Maynard of Chiswick, 1261:. Oxford University Press. p. 330. 1133:"Royal Navy (RN) Officers 1939–1945 - B" 813:naval base in 1919 and sank the cruiser 1009:"WW1 numbers and losses of MTB classes" 934: 914: 304:A 40 ft (12 m) boat based on 67:and up to end of the Second World War. 1464:. National Maritime Museum, Greenwich. 468: 336: 155: 1501:Motor torpedo boats of the Royal Navy 476: 7: 1373:. Casemate Publishers. p. 254. 1345:, 7/8 1919-20. pp87-99 and 218-240* 204:39 +2 not taken into service as CMB 121:of a light cruiser, i.e. 4.5 tons. 1073:Air Commodore F. R. Banks (1978). 877:County Council and on-loan to the 25: 1026:"A naval operation in the Baltic" 969:"Royal Navy Ships of World War 1" 748:to accompany his Victoria Cross. 459:John I. Thornycroft & Company 31:. For other coastal defence, see 949:. Tony DiGiulian. 7 October 2019 903:Coastal Forces of the Royal Navy 879:British Military Powerboat Trust 737:for his part in this operation. 682:under the command of Lieutenant 477: 187: 1215:Mills, Steve (5 October 2019). 854:aircraft trials in March 1917, 424:34–42 kn (63–78 km/h) 1506:Ship classes of the Royal Navy 995:Marine Modelling International 795:Democratic Republic of Georgia 791:Azerbaijan Democratic Republic 82:at anchor in their bases, the 1: 1451:Fast Fighting Ships 1870-1945 1146:Keyes, Roger (1 March 2013). 833:where it is on loan from the 668:The Historic Dockyard Chatham 835:Imperial War Museum, Duxford 831:Portsmouth Historic Dockyard 752:(Coastal Motor Boat 88) and 1194:. London, UK: Arrow Books. 746:Distinguished Service Order 700:Distinguished Service Cross 333:55 foot Coastal Motor Boats 152:40-foot Coastal Motor Boats 50:Imperial War Museum Duxford 1522: 862:and took part in the 2014 762: 649:70-foot Coastal Motor Boat 385:60 ft (18 m) o/a 233:45 ft (14 m) o/a 124:The CMBs were designed by 26: 1112:. National Historic Ships 773:(travelling by rail from 588:11.5 ft (3.5 m) 563: 535:55 foot CMBT (1941 class) 526: 471: 368: 339: 224: 158: 48:(1916) on display at the 1190:Ferguson, Harry (2010). 765:British Caspian Flotilla 257:Single 18" torpedo, 2-4 115:18-inch (450 mm) torpedo 1389:National Historic Ships 1077:. Airlife. p. 29. 870:, certificate no 2430. 868:National Historic Ships 758:Russell Hamilton McBean 733:. Agar was awarded the 696:mentioned in Despatches 688:HM Coastal Motor Boat 4 612:40 knots (74 km/h) 564:General characteristics 401:3 ft (0.91 m) 393:11 ft (3.4 m) 369:General characteristics 225:General characteristics 76:Harwich destroyer force 754:Claude Congreve Dobson 658: 596:4 ft (1.2 m) 580:60 ft (18 m) 53: 1371:The Dawn of the Drone 1369:Mills, Steve (2019). 1152:www.naval-history.net 847:Distance Control Boat 750:Gordon Charles Steele 656: 43: 1244:. Vol. 8. 1969. 1062:. 1985. p. 100. 715:In 1919 the British 698:and was awarded the 80:Imperial German Navy 46:Coastal Motor Boat 4 33:coastal defence ship 1460:M P Cocker (2006). 1449:Harald Fox (1978). 839:Imperial War Museum 787:Republic of Armenia 294:. She was a single- 134:Rowhedge Iron Works 72:the First World War 18:Coastal Motor Boats 1416:on 2 January 2005. 1328:The London Gazette 1308:The London Gazette 1288:The London Gazette 1032:on 28 October 2007 873:MTB 331, owned by 742:a larger operation 659: 657:CMB 103 at Chatham 57:Coastal Motor Boat 54: 1491:Fast attack craft 1434:on 15 March 2008. 1268:978-0-19-860527-0 1201:978-0-09951-465-7 1176:. 2 August 2011. 973:NAVAL-HISTORY.NET 639: 638: 452: 451: 284: 283: 16:(Redirected from 1513: 1465: 1454: 1436: 1435: 1424: 1418: 1417: 1406: 1400: 1399: 1397: 1395: 1381: 1375: 1374: 1366: 1360: 1359: 1352: 1346: 1339: 1333: 1332: 1319: 1313: 1312: 1299: 1293: 1292: 1279: 1273: 1272: 1252: 1246: 1245: 1238: 1232: 1231: 1229: 1227: 1212: 1206: 1205: 1187: 1181: 1180: 1170: 1164: 1163: 1161: 1159: 1143: 1137: 1136: 1129: 1123: 1121: 1119: 1117: 1106: 1100: 1095: 1089: 1088: 1070: 1064: 1063: 1056: 1045: 1044: 1039: 1037: 1028:. Archived from 1022: 1013: 1012: 1005: 999: 998: 990: 984: 983: 981: 979: 965: 959: 958: 956: 954: 939: 922: 919: 889:, then later at 684:W. N. T. Beckett 486: 481: 469: 440:2 18" torpedoes 337: 193: 191: 190: 156: 21: 1521: 1520: 1516: 1515: 1514: 1512: 1511: 1510: 1481: 1480: 1472: 1459: 1448: 1445: 1443:Further reading 1440: 1439: 1426: 1425: 1421: 1408: 1407: 1403: 1393: 1391: 1383: 1382: 1378: 1368: 1367: 1363: 1354: 1353: 1349: 1340: 1336: 1321: 1320: 1316: 1301: 1300: 1296: 1281: 1280: 1276: 1269: 1254: 1253: 1249: 1240: 1239: 1235: 1225: 1223: 1214: 1213: 1209: 1202: 1189: 1188: 1184: 1172: 1171: 1167: 1157: 1155: 1145: 1144: 1140: 1131: 1130: 1126: 1115: 1113: 1108: 1107: 1103: 1096: 1092: 1085: 1075:I Kept No Diary 1072: 1071: 1067: 1058: 1057: 1048: 1035: 1033: 1024: 1023: 1016: 1007: 1006: 1002: 992: 991: 987: 977: 975: 967: 966: 962: 952: 950: 941: 940: 936: 931: 926: 925: 920: 916: 911: 899: 864:Remembrance Day 852:β€˜Aerial Target' 803: 767: 676: 674:Service history 651: 482: 335: 311:18-inch torpedo 188: 186: 154: 130:Salter Brothers 65:First World War 36: 23: 22: 15: 12: 11: 5: 1519: 1517: 1509: 1508: 1503: 1498: 1496:Military boats 1493: 1483: 1482: 1479: 1478: 1471: 1470:External links 1468: 1467: 1466: 1456: 1455: 1444: 1441: 1438: 1437: 1419: 1401: 1376: 1361: 1347: 1334: 1314: 1294: 1274: 1267: 1247: 1242:History of WWI 1233: 1207: 1200: 1182: 1165: 1154:. Gordon Smith 1138: 1124: 1101: 1090: 1083: 1065: 1046: 1014: 1000: 985: 960: 933: 932: 930: 927: 924: 923: 913: 912: 910: 907: 906: 905: 898: 895: 802: 799: 763:Main article: 735:Victoria Cross 707:Zeebrugge Raid 675: 672: 650: 647: 637: 636: 633: 632: 626: 622: 621: 618: 614: 613: 610: 606: 605: 602: 598: 597: 594: 590: 589: 586: 582: 581: 578: 574: 573: 570: 566: 565: 561: 560: 557: 553: 552: 549: 545: 544: 541: 537: 536: 533: 529: 528: 527:Class overview 524: 523: 520: 516: 515: 510: 506: 505: 502: 498: 497: 492: 488: 487: 484:United Kingdom 474: 473: 450: 449: 446: 445: 438: 434: 433: 430: 426: 425: 422: 418: 417: 416: 415: 412: 407: 403: 402: 399: 395: 394: 391: 387: 386: 383: 379: 378: 375: 371: 370: 366: 365: 362: 358: 357: 354: 350: 349: 346: 342: 341: 340:Class overview 334: 331: 282: 281: 278: 277: 274: 270: 269: 255: 251: 250: 247: 243: 242: 239: 235: 234: 231: 227: 226: 222: 221: 218: 214: 213: 210: 206: 205: 202: 198: 197: 184: 180: 179: 173: 169: 168: 165: 161: 160: 159:Class overview 153: 150: 105:or for laying 24: 14: 13: 10: 9: 6: 4: 3: 2: 1518: 1507: 1504: 1502: 1499: 1497: 1494: 1492: 1489: 1488: 1486: 1477: 1474: 1473: 1469: 1463: 1458: 1457: 1452: 1447: 1446: 1442: 1433: 1429: 1423: 1420: 1415: 1411: 1405: 1402: 1390: 1386: 1380: 1377: 1372: 1365: 1362: 1357: 1351: 1348: 1344: 1338: 1335: 1330: 1329: 1324: 1318: 1315: 1310: 1309: 1304: 1298: 1295: 1290: 1289: 1284: 1278: 1275: 1270: 1264: 1260: 1259: 1251: 1248: 1243: 1237: 1234: 1222: 1218: 1211: 1208: 1203: 1197: 1193: 1186: 1183: 1179: 1175: 1169: 1166: 1153: 1149: 1142: 1139: 1134: 1128: 1125: 1111: 1105: 1102: 1099: 1094: 1091: 1086: 1084:0-9504543-9-7 1080: 1076: 1069: 1066: 1061: 1055: 1053: 1051: 1047: 1043: 1031: 1027: 1021: 1019: 1015: 1010: 1004: 1001: 996: 989: 986: 974: 970: 964: 961: 948: 944: 938: 935: 928: 918: 915: 908: 904: 901: 900: 896: 894: 892: 888: 884: 880: 876: 871: 869: 865: 861: 857: 853: 848: 842: 840: 836: 832: 828: 824: 820: 816: 812: 808: 800: 798: 796: 792: 788: 784: 780: 776: 772: 766: 761: 759: 755: 751: 747: 743: 738: 736: 732: 731: 726: 722: 721:Augustus Agar 718: 713: 710: 708: 703: 701: 697: 693: 689: 685: 681: 673: 671: 669: 665: 655: 648: 646: 644: 635: 634: 630: 627: 624: 623: 619: 616: 615: 611: 608: 607: 603: 600: 599: 595: 592: 591: 587: 584: 583: 579: 576: 575: 571: 568: 567: 562: 558: 555: 554: 550: 547: 546: 542: 539: 538: 534: 531: 530: 525: 521: 518: 517: 514: 511: 508: 507: 503: 500: 499: 496: 493: 490: 489: 485: 480: 475: 470: 467: 463: 460: 455: 448: 447: 443: 439: 436: 435: 431: 428: 427: 423: 420: 419: 413: 410: 409: 408: 405: 404: 400: 397: 396: 392: 389: 388: 384: 381: 380: 376: 373: 372: 367: 363: 360: 359: 355: 352: 351: 347: 344: 343: 338: 332: 330: 327: 323: 318: 314: 312: 307: 302: 300: 297: 293: 289: 280: 279: 275: 272: 271: 268: 264: 263:depth charges 260: 256: 253: 252: 248: 245: 244: 240: 237: 236: 232: 229: 228: 223: 219: 216: 215: 211: 208: 207: 203: 200: 199: 196: 185: 182: 181: 177: 174: 171: 170: 166: 163: 162: 157: 151: 149: 147: 143: 139: 135: 131: 127: 122: 120: 116: 112: 108: 104: 103:depth charges 100: 95: 91: 89: 85: 81: 77: 73: 68: 66: 62: 58: 51: 47: 42: 38: 34: 30: 19: 1461: 1450: 1432:the original 1422: 1414:the original 1404: 1392:. Retrieved 1388: 1379: 1370: 1364: 1350: 1343:Naval Review 1342: 1337: 1326: 1317: 1306: 1297: 1286: 1277: 1257: 1250: 1241: 1236: 1224:. Retrieved 1220: 1210: 1191: 1185: 1177: 1168: 1156:. Retrieved 1151: 1141: 1127: 1114:. Retrieved 1104: 1093: 1074: 1068: 1059: 1041: 1034:. Retrieved 1030:the original 1003: 994: 988: 976:. Retrieved 972: 963: 951:. Retrieved 947:Navweaps.com 946: 937: 917: 882: 872: 843: 819:Platt's Eyot 814: 805:The hull of 804: 768: 739: 728: 714: 711: 704: 677: 660: 643:World War II 640: 569:Displacement 494: 464: 456: 453: 441: 374:Displacement 322:torpedo tube 319: 315: 305: 303: 291: 285: 138:J. W. Brooks 132:of Oxford, 123: 96: 92: 69: 56: 55: 37: 1394:3 September 1323:"No. 31638" 1303:"No. 31638" 1283:"No. 31613" 1221:History Hit 841:in London. 771:Caspian Sea 740:In August, 705:During the 686:commanding 664:museum ship 513:Thornycroft 348:55 foot CMB 288:Thornycroft 176:Thornycroft 167:40 foot CMB 126:Thornycroft 29:patrol boat 1485:Categories 929:References 887:Teignmouth 601:Propulsion 543:Royal Navy 504:Royal Navy 406:Propulsion 356:Royal Navy 306:Miranda IV 299:hydroplane 292:Miranda IV 259:Lewis guns 246:Complement 238:Propulsion 195:Royal Navy 61:Royal Navy 1110:"CMB 103" 978:27 August 875:Hampshire 860:Avonmouth 856:A. M. Low 811:Kronstadt 801:Survivors 781:coast to 779:Black Sea 725:Kronstadt 692:Zeebrugge 556:Preserved 548:Completed 540:Operators 457:In 1917, 361:Completed 353:Operators 286:In 1910, 220:1 (CMB 4) 217:Preserved 209:Cancelled 201:Completed 183:Operators 111:Lewis gun 99:torpedoes 88:North Sea 84:Admiralty 1226:23 March 1036:28 March 897:See also 827:Kingston 793:and the 629:Mahogany 617:Armament 519:Launched 501:Operator 437:Armament 414:2 shafts 254:Armament 172:Builders 1158:9 April 1116:9 April 953:9 April 891:Bristol 821:on the 777:on the 702:(DSC). 680:Dunkirk 593:Draught 572:17 tons 559:MTB 331 509:Builder 495:MTB 331 472:History 398:Draught 377:11 tons 326:cordite 142:Sunbeam 70:During 63:in the 1385:"CMB9" 1265:  1198:  1081:  883:Jonrey 823:Thames 775:Batumi 577:Length 462:ramp. 382:Length 230:Length 192:  146:Napier 119:davits 909:Notes 825:near 807:CMB 4 625:Notes 609:Speed 421:Speed 273:Notes 267:mines 107:mines 1396:2020 1263:ISBN 1228:2021 1196:ISBN 1160:2022 1118:2022 1079:ISBN 1038:2008 980:2022 955:2022 815:Oleg 783:Baku 730:Oleg 585:Beam 532:Name 522:1941 491:Name 429:Crew 390:Beam 345:Name 296:step 164:Name 144:and 885:at 432:3-5 265:or 249:2-3 44:HM 1487:: 1387:. 1325:. 1305:. 1285:. 1219:. 1150:. 1049:^ 1040:. 1017:^ 971:. 945:. 797:. 789:, 670:. 551:14 442:or 364:88 313:. 261:, 212:16 148:. 101:, 90:. 1453:. 1398:. 1358:. 1271:. 1230:. 1204:. 1162:. 1135:. 1122:. 1120:. 1087:. 1011:. 997:. 982:. 957:. 35:. 20:)

Index

Coastal Motor Boats
patrol boat
coastal defence ship

Coastal Motor Boat 4
Imperial War Museum Duxford
Royal Navy
First World War
the First World War
Harwich destroyer force
Imperial German Navy
Admiralty
North Sea
torpedoes
depth charges
mines
Lewis gun
18-inch (450 mm) torpedo
davits
Thornycroft
Salter Brothers
Rowhedge Iron Works
J. W. Brooks
Sunbeam
Napier
Thornycroft
Royal Navy
Lewis guns
depth charges
mines

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