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Draft (hull)

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602: 254: 511: 503: 450: 341: 74: 274: 176: 33: 827:, which can submerge to different depths at sea, specifying the current distance from the water surface to the bottom of the submarine's keel. It is used in navigation to avoid underwater obstacles and hitting the ocean floor, and as a standard point on the submarine for depth measurements. Submarines usually also have a specified draft used while operating on the surface, for navigating in harbors and at docks. 896:
when in full load condition is the "draft load". ... TRIM. The arithmetic sum of the drafts forward and aft above and below the mean water-line. The angle of trim is the angle between the plane of flotation and the mean water-line plane. A vessel "trims by the head" or "trims by the stern" when the vessel inclines forward or aft so that her plane of flotation is not coincident with her mean water-line plane.
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The trim of a ship is the difference between the forward and aft drafts relative to the designed waterline. When the aft draft relative to the designed water line (DWL) is greater the vessel is deemed to have a positive trim, or to be trimmed by the stern, and it has a negative trim, or is trimmed by
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The mean draft is typically calculated from the averaging of the stern and bow drafts, with correction for water level variation and value of the position of forward (F) with respect to the average perpendicular numerical value (given in the ship's drawings or stability manual)) An alternative visual
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available. The more heavily a vessel is loaded, the deeper it sinks into the water, and the greater its draft (also referred to as its displacement). After construction, the shipyard creates a table showing how much water the vessel displaces based on its draft and the density of the water (salt or
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When measured to the lowest projecting portion of the vessel, it is called the "draft, extreme"; when measured at the bow, it is called "draft, forward"; and when measured at the stern, the "draft, aft"; the average of the draft, forward, and the draft, aft is the "draft, mean", and the mean draft
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When measured to the lowest projecting portion of the vessel, it is called the "draft, extreme"; when measured at the bow, it is called "draft, forward"; and when measured at the stern, the "draft, aft"; the average of the draft, forward, and the draft, aft is the "draft, mean", and the mean draft
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of the hull and the center of gravity. However, a "light" ship may have an excessively high stability which can cause uncomfortable rolling of the ship. A fully laden ship (with a large draft) can have either a high or low stability, depending on the height of the
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In commercial ship operations, the ship will usually quote the mean draft as the vessel's draft. However, in navigational situations, the maximum draft, usually the aft draft, will be known on the bridge and will be shared with the
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Draft is a significant factor limiting navigable waterways, especially for large vessels. This includes many shallow coastal waters and reefs, but also some major shipping lanes, therefore restriction on the maximum draft (the
648:; the Imperial system is as stated above (markings 6-inches high, spaced at 12-inch intervals, where the bottom of each marking is the draft in feet); in metric marking, the bottom of each draft mark is the draft in 633:). The numbers and markings were large and clear; for instance, on U.S. naval vessels, the numbers were, historically, as a standard, 6-inches tall, with spacing of 12-inches bottom to bottom, vertically. 688:), and may ballast further to reduce windage or for better directional stability or seakeeping, or to distribute load along the hull to reduce hogging and sagging stresses. To achieve this they use 696:
to stabilize the ship, following the unloading of cargo. The draft of a large ship has little direct link with its stability because stability depends mainly on the relative positions of the
881: 315:, or other reference point. Draft varies according to the loaded condition of the ship. A deeper draft means the ship will have greater vertical depth below the waterline. Draft is used in 421:
fresh). The draft can also be used to determine the weight of cargo on board by calculating the total displacement of water, accounting for the content of the ship's
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Large ships experience a draft increase to heel effect where the ship's beam angles on one side during an alteration of course (sometimes known as turning effect).
323:) to ensure the ship can navigate safely, without grounding. Navigators can determine their draught by calculation or by visual observation (of the ship's painted 803:
to navigate through shallower water. This makes it possible for these boats to access smaller ports, to travel along rivers and even to 'beach' the boat. A
629:. The number and its associated marking indicate the distance from the marking to the bottom lowest fixed reference point of the vessel (e.g., its 1048:
International Maritime Dictionary: An Encyclopedic Dictionary of Useful Maritime Terms and Phrases, Together with Equivalents in French and German
712:, which causes a local pressure reduction under the vessel. This in effect causes a ship to 'vertically sink 'down' leading to a reduction in 1199: 732:, a distance from the seabed or riverbed to the water level) is sometimes established (in particular, all ports set up draft limits). 807:
may increase ultimate stability in, depending on the hull form, as the center of gravity can be lower. A broad beamed boat like a
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carriers, are some of the ships that have too deep a draft when laden, for either the Strait of Malacca or the Suez Canal.
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of any part of the vessel, including appendages such as rudders, propellers and drop keels if deployed. The related term
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Variation due to movable appendages, such as centreboards, daggerboards, drop keels, leeboards, and retractable rudders
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Graphical representation of the waterline of a ship (blue line), absent a lower projecting keel or propeller, with the
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The draft of a ship can be affected by multiple factors, besides the variations caused by changes in displacement:
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the bow, when the forward draft relative to DWL is the greater. In such a case it may be referred to as being
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The draft of a ship can be increased by longitudinal motion in shallow water, a hydrodynamic effect known as
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These are markings and numbers located on both sides of a vessel, as close as possible to the bow and stern
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Piozet, Charles and the Div. of Personnel Supervision with assistance of the Bur. of Ships (March 2023) .
1412: 1628: 1185: 740:—do have a draft limit (and an "air draft" limit for passing under bridges) but are usually limited by 106: 1333: 1155: 1084: 1022: 988: 927: 780: 426: 775:. The Strait only allows ships to have 0.4 m (1.31 ft) more draft than the Suez Canal. 601: 538:
approximation is that given by reading the draught at the waterline, at or very near to amidships.
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Draft determines the minimum depth of water a ship or boat can safely navigate in relation to the
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are able to transit the Suez Canal when unladen or partially laden, but not when fully laden.
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can provide high initial stability with a small draft, but the width of the boat increases.
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calculations, where the draft is calculated with the available depth of water (from
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ship, is the deepest draft able to transit the very busy but relatively shallow
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Larger ships need to keep the propeller immersed when they are light (without
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Projection of non-retractable rudders, propellers or thrusters below the hull
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below the light-load line and calibrated to reflect the draft of the ship.
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These hull markings constitute a "banded" scale, and may be accompanied by
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and each mark is one decimeter high, spaced at intervals of 2 decimeters.
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The difference between the forward and aft drafts of a ship is termed its
405:, or other reference point". That is, the draft or draught is the maximum 1338: 761: 1557: 824: 820: 768: 753: 697: 649: 531: 474: in this section. Unsourced material may be challenged and removed. 365: in this section. Unsourced material may be challenged and removed. 279: 510: 1582: 1552: 1300: 851: 836: 808: 626: 502: 422: 410: 402: 394: 308: 300: 1177: 449: 340: 204:. Statements consisting only of original research should be removed. 73: 1597: 1547: 1542: 1537: 1532: 784: 776: 273: 413:
is the maximum height of any part of the vessel above the water.
1587: 1562: 1527: 1323: 757: 733: 668: 882:"Nomenclature of Naval Vessels: Glossary of Shipbuilding Terms" 609: 265: ; for other dimensions used to describe a ship, see also 1576: 952:"Draft Surveys: Methodology, Calculations, and common errors" 685: 622: 579:
Variation as a result of a ship moving in shallow waters, or
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A ship's draft/draught is the "depth of the vessel below the
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Variations in water density due to temperature and salinity
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Canals are not the only draft-limited shipping lanes. A
752:. However, ships can be longer, wider and higher in the 330: 1045: 1005: 973: 1111: 1072: 283:, an example of the Imperial system of such markings. 875: 873: 871: 869: 867: 613:
Load line mark and draft marks on the side of a ship
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Imperial system in Roman numeration of the bow scale
98:. Unsourced material may be challenged and removed. 1050:(2 ed.). Van Nostrand Reinhold. p. 239. 736:class ships—the largest ships able to transit the 705:, which is affected by the distribution of cargo. 864: 593:when in full load condition is the "draft load". 1610: 1079:Gilardoni, Eduardo O.; Presedo, Juan P. (2017). 1078: 1017:Gilardoni, Eduardo O.; Presedo, Juan P. (2017). 1016: 983:Gilardoni, Eduardo O.; Presedo, Juan P. (2017). 982: 1131:Turpin, Edward A.; McEwen, William A. (1980). 1046:RenĂ© de baron Kerchove (1961). "Draft Gauge". 917: 915: 913: 911: 909: 907: 905: 534:) is measured at the perpendicular of the bow. 397:measured vertically to the lowest part of the 299:is a determined depth of the vessel below the 1193: 1112:Hayler, William B.; Keever, John M. (2003). 1039: 902: 61:Learn how and when to remove these messages 1200: 1186: 663:is used on larger ships. It consists of a 439: 1355:Panama Canal/Universal Measurement System 490:Learn how and when to remove this message 381:Learn how and when to remove this message 238:Learn how and when to remove this message 220:Learn how and when to remove this message 158:Learn how and when to remove this message 958: 608: 600: 509: 501: 272: 252: 1149: 964: 921: 14: 1611: 1400: 1207: 1181: 261:(lower image) indicated as dimension 250:Depth of a vessel below its waterline 969:. Sixth: Elsevier. pp. 143–144. 967:Ship Stability for Masters and Mates 472:adding citations to reliable sources 443: 363:adding citations to reliable sources 334: 331:Introduction to specific terminology 169: 96:adding citations to reliable sources 67: 26: 277:Draft markings on the stern of the 24: 1133:Merchant Marine Officers' Handbook 1105: 25: 1640: 1173: 1114:American Merchant Seaman's Manual 790: 42:This article has multiple issues. 448: 339: 174: 72: 31: 674: 459:needs additional citations for 350:needs additional citations for 83:needs additional citations for 50:or discuss these issues on the 944: 679: 596: 321:Electronic navigational charts 13: 1: 1228:Length between perpendiculars 857: 814: 558: 303:, measured vertically to its 1081:Navigation in Shallow Waters 1019:Navigation in Shallow Waters 985:Navigation in Shallow Waters 965:Derrett, D.R. (2006). "12". 722: 640:markings. The scale may use 7: 1413:Twenty-foot equivalent unit 1116:. Cornell Maritime Prress. 830: 605:Draft marks on a ship's bow 200:the claims made and adding 10: 1645: 1360:Thames measurement tonnage 1152:Ship Squat and Interaction 924:Ship Squat and Interaction 781:Ultra Large Crude Carriers 756:, the limiting factor for 525:perpendicular of the stern 1518: 1487: 1451: 1434:Builder's Old Measurement 1426: 1393: 1368: 1347: 1334:Compensated gross tonnage 1316: 1309: 1293: 1280:Load line (Plimsoll Line) 1257: 1241: 1215: 1156:Witherby Publishing Group 1085:Witherby Publishing Group 1023:Witherby Publishing Group 989:Witherby Publishing Group 928:Witherby Publishing Group 1083:. Livingston, Scotland: 1021:. Livingston, Scotland: 987:. Livingston, Scotland: 1510:Metacentric height (GM) 1233:Length at the waterline 1150:Barrass, C. B. (2009). 922:Barrass, C. B. (2009). 638:international load line 625:, and then also, often 440:Ship draft measurements 1376:Gross register tonnage 614: 606: 515: 507: 284: 270: 1469:Standard displacement 1417:Intermodal containers 760:ships is draft. Some 612: 604: 523:) is measured at the 513: 505: 427:Archimedes' principle 276: 256: 1619:Nautical terminology 1381:Net register tonnage 1285:Under keel clearance 991:. pp. 140–141. 748:, for fitting into 714:under keel clearance 657:internal draft gauge 468:improve this article 418:under keel clearance 359:improve this article 317:under keel clearance 92:improve this article 1479:Normal displacement 1464:Loaded displacement 530:The draft forward ( 1474:Light displacement 1408:Deadweight tonnage 954:. 19 October 2020. 847:Naval architecture 692:distributed among 615: 607: 516: 508: 285: 271: 185:possibly contains 1629:Ship measurements 1606: 1605: 1567:§ Neopanamax 1548:Handymax/Supramax 1447: 1446: 1389: 1388: 1209:Ship measurements 1165:978-1-905331-60-4 1094:978-1-85609-667-6 1057:978-0-442-02062-0 1032:978-1-85609-667-6 998:978-1-85609-667-6 937:978-1-905331-60-4 897: 842:Hull (watercraft) 773:Strait of Malacca 703:center of gravity 567:Variation by trim 500: 499: 492: 391: 390: 383: 267:ship measurements 248: 247: 240: 230: 229: 222: 187:original research 168: 167: 160: 142: 107:"Draft" hull 65: 16:(Redirected from 1636: 1398: 1397: 1314: 1313: 1202: 1195: 1188: 1179: 1178: 1169: 1146: 1127: 1099: 1098: 1076: 1070: 1069: 1043: 1037: 1036: 1014: 1003: 1002: 980: 971: 970: 962: 956: 955: 948: 942: 941: 919: 900: 899: 894: 891: 889: 877: 544:down-by-the-head 506:Metric bow scale 495: 488: 484: 481: 475: 452: 444: 386: 379: 375: 372: 366: 343: 335: 243: 236: 225: 218: 214: 211: 205: 202:inline citations 178: 177: 170: 163: 156: 152: 149: 143: 141: 100: 76: 68: 57: 35: 34: 27: 21: 1644: 1643: 1639: 1638: 1637: 1635: 1634: 1633: 1609: 1608: 1607: 1602: 1514: 1483: 1443: 1422: 1385: 1364: 1343: 1305: 1289: 1253: 1237: 1211: 1206: 1176: 1166: 1143: 1124: 1108: 1106:Further reading 1103: 1102: 1095: 1077: 1073: 1058: 1044: 1040: 1033: 1015: 1006: 999: 981: 974: 963: 959: 950: 949: 945: 938: 920: 903: 887: 885: 878: 865: 860: 833: 817: 793: 744:, or sometimes 725: 690:sailing ballast 682: 677: 661:draft indicator 599: 561: 519:The draft aft ( 496: 485: 479: 476: 465: 453: 442: 387: 376: 370: 367: 356: 344: 333: 251: 244: 233: 232: 231: 226: 215: 209: 206: 191: 179: 175: 164: 153: 147: 144: 101: 99: 89: 77: 36: 32: 23: 22: 15: 12: 11: 5: 1642: 1632: 1631: 1626: 1621: 1604: 1603: 1601: 1600: 1595: 1590: 1585: 1580: 1574: 1569: 1560: 1555: 1550: 1545: 1540: 1535: 1530: 1524: 1522: 1516: 1515: 1513: 1512: 1507: 1502: 1497: 1495:Inclining test 1491: 1489: 1485: 1484: 1482: 1481: 1476: 1471: 1466: 1461: 1455: 1453: 1449: 1448: 1445: 1444: 1442: 1441: 1439:Moorsom System 1436: 1430: 1428: 1424: 1423: 1421: 1420: 1410: 1404: 1402: 1395: 1391: 1390: 1387: 1386: 1384: 1383: 1378: 1372: 1370: 1366: 1365: 1363: 1362: 1357: 1351: 1349: 1345: 1344: 1342: 1341: 1336: 1331: 1326: 1320: 1318: 1311: 1307: 1306: 1304: 1303: 1297: 1295: 1291: 1290: 1288: 1287: 1282: 1277: 1272: 1267: 1261: 1259: 1255: 1254: 1252: 1251: 1245: 1243: 1239: 1238: 1236: 1235: 1230: 1225: 1223:Length overall 1219: 1217: 1213: 1212: 1205: 1204: 1197: 1190: 1182: 1175: 1174:External links 1172: 1171: 1170: 1164: 1147: 1141: 1128: 1122: 1107: 1104: 1101: 1100: 1093: 1087:. p. 35. 1071: 1056: 1038: 1031: 1025:. p. 67. 1004: 997: 972: 957: 943: 936: 901: 884:(2nd ed.) 862: 861: 859: 856: 855: 854: 849: 844: 839: 832: 829: 819:A term called 816: 813: 801:pleasure boats 792: 791:Pleasure boats 789: 746:length overall 724: 721: 681: 678: 676: 673: 667:attached to a 665:pressure gauge 642:Imperial units 598: 595: 590: 589: 586: 583: 577: 574: 568: 560: 557: 548: 547: 539: 535: 528: 498: 497: 456: 454: 447: 441: 438: 389: 388: 347: 345: 338: 332: 329: 307:'s lowest—its 249: 246: 245: 228: 227: 182: 180: 173: 166: 165: 80: 78: 71: 66: 40: 39: 37: 30: 9: 6: 4: 3: 2: 1641: 1630: 1627: 1625: 1622: 1620: 1617: 1616: 1614: 1599: 1596: 1594: 1593:VLCC and ULCC 1591: 1589: 1586: 1584: 1581: 1578: 1575: 1573: 1570: 1568: 1564: 1561: 1559: 1556: 1554: 1551: 1549: 1546: 1544: 1541: 1539: 1536: 1534: 1531: 1529: 1526: 1525: 1523: 1521: 1517: 1511: 1508: 1506: 1505:Angle of loll 1503: 1501: 1498: 1496: 1493: 1492: 1490: 1486: 1480: 1477: 1475: 1472: 1470: 1467: 1465: 1462: 1460: 1457: 1456: 1454: 1450: 1440: 1437: 1435: 1432: 1431: 1429: 1425: 1418: 1414: 1411: 1409: 1406: 1405: 1403: 1399: 1396: 1392: 1382: 1379: 1377: 1374: 1373: 1371: 1367: 1361: 1358: 1356: 1353: 1352: 1350: 1346: 1340: 1337: 1335: 1332: 1330: 1329:Gross tonnage 1327: 1325: 1322: 1321: 1319: 1315: 1312: 1308: 1302: 1299: 1298: 1296: 1292: 1286: 1283: 1281: 1278: 1276: 1273: 1271: 1270:Moulded depth 1268: 1266: 1263: 1262: 1260: 1256: 1250: 1247: 1246: 1244: 1240: 1234: 1231: 1229: 1226: 1224: 1221: 1220: 1218: 1214: 1210: 1203: 1198: 1196: 1191: 1189: 1184: 1183: 1180: 1167: 1161: 1157: 1154:. Edinburgh: 1153: 1148: 1144: 1142:0-87033-056-X 1138: 1134: 1129: 1125: 1123:0-87033-549-9 1119: 1115: 1110: 1109: 1096: 1090: 1086: 1082: 1075: 1067: 1063: 1059: 1053: 1049: 1042: 1034: 1028: 1024: 1020: 1013: 1011: 1009: 1000: 994: 990: 986: 979: 977: 968: 961: 953: 947: 939: 933: 929: 926:. Edinburgh: 925: 918: 916: 914: 912: 910: 908: 906: 898: 883: 876: 874: 872: 870: 868: 863: 853: 850: 848: 845: 843: 840: 838: 835: 834: 828: 826: 822: 812: 810: 806: 802: 798: 788: 786: 782: 778: 774: 770: 765: 763: 759: 755: 751: 747: 743: 739: 735: 731: 720: 717: 715: 711: 706: 704: 699: 695: 694:ballast tanks 691: 687: 672: 670: 666: 662: 658: 653: 651: 647: 643: 639: 634: 632: 628: 624: 620: 611: 603: 594: 587: 584: 582: 578: 575: 573: 570:Variation by 569: 566: 565: 564: 556: 554: 545: 540: 536: 533: 529: 526: 522: 518: 517: 512: 504: 494: 491: 483: 473: 469: 463: 462: 457:This section 455: 451: 446: 445: 437: 435: 430: 428: 424: 419: 414: 412: 408: 404: 400: 396: 385: 382: 374: 364: 360: 354: 353: 348:This section 346: 342: 337: 336: 328: 326: 322: 318: 314: 310: 306: 302: 298: 294: 290: 282: 281: 275: 268: 264: 260: 255: 242: 239: 224: 221: 213: 203: 199: 195: 189: 188: 183:This article 181: 172: 171: 162: 159: 151: 140: 137: 133: 130: 126: 123: 119: 116: 112: 109: â€“  108: 104: 103:Find sources: 97: 93: 87: 86: 81:This article 79: 75: 70: 69: 64: 62: 55: 54: 49: 48: 43: 38: 29: 28: 19: 1459:Displacement 1264: 1151: 1132: 1113: 1080: 1074: 1047: 1041: 1018: 984: 966: 960: 946: 923: 893: 886:. Retrieved 823:is used for 818: 804: 796: 794: 766: 762:supertankers 738:Panama Canal 729: 726: 718: 707: 683: 675:Implications 660: 656: 654: 646:metric units 635: 616: 591: 562: 549: 543: 486: 477: 466:Please help 461:verification 458: 433: 431: 425:, and using 415: 392: 377: 368: 357:Please help 352:verification 349: 292: 288: 286: 278: 262: 258: 234: 216: 207: 184: 154: 145: 135: 128: 121: 114: 102: 90:Please help 85:verification 82: 58: 51: 45: 44:Please help 41: 18:Draft (ship) 1579:(Qatar-max) 1348:Specialized 1339:Net tonnage 805:large draft 797:small draft 730:draft limit 680:Large ships 597:Draft marks 1624:Navigation 1613:Categories 1558:Malaccamax 1066:1039382382 858:References 825:submarines 821:keel depth 815:Submarines 783:and a few 769:Malaccamax 754:Suez Canal 698:metacenter 650:decimeters 559:Variations 480:March 2024 403:propellers 371:March 2024 325:load lines 309:propellers 280:Cutty Sark 210:March 2024 194:improve it 118:newspapers 47:improve it 1583:Seawaymax 1553:Handysize 1488:Stability 1317:Worldwide 1301:Air draft 1275:Freeboard 852:Waterline 837:Air draft 809:catamaran 723:Waterways 627:amidships 411:air draft 395:waterline 301:waterline 198:verifying 53:talk page 1598:Yamalmax 1543:Chinamax 1538:Capesize 1533:Baltimax 1394:Capacity 888:26 March 831:See also 785:Chinamax 777:Capesize 148:May 2022 1588:Suezmax 1572:PĂ©niche 1563:Panamax 1528:Aframax 1427:Archaic 1401:Current 1369:Archaic 1324:Tonnage 1242:Breadth 799:allows 758:Suezmax 734:Panamax 669:seacock 423:bunkers 293:draught 192:Please 132:scholar 1520:Limits 1452:Weight 1310:Volume 1294:Height 1216:Length 1162:  1139:  1120:  1091:  1064:  1054:  1029:  995:  934:  134:  127:  120:  113:  105:  1577:Q-Max 1265:Draft 1258:Depth 750:locks 710:squat 686:cargo 623:stern 581:squat 553:pilot 521:stern 407:depth 311:, or 295:of a 289:draft 259:draft 139:JSTOR 125:books 1565:and 1500:List 1249:Beam 1160:ISBN 1137:ISBN 1118:ISBN 1089:ISBN 1062:OCLC 1052:ISBN 1027:ISBN 993:ISBN 932:ISBN 890:2024 742:beam 631:keel 621:and 572:list 434:trim 399:hull 313:keel 305:hull 297:ship 287:The 111:news 659:or 655:An 644:or 619:bow 555:. 532:bow 470:by 429:. 361:by 327:). 291:or 196:by 94:by 1615:: 1158:. 1060:. 1007:^ 975:^ 930:. 904:^ 892:. 866:^ 795:A 779:, 716:. 436:. 401:, 56:. 1419:) 1415:( 1201:e 1194:t 1187:v 1168:. 1145:. 1126:. 1097:. 1068:. 1035:. 1001:. 940:. 546:. 527:. 493:) 487:( 482:) 478:( 464:. 384:) 378:( 373:) 369:( 355:. 269:. 263:d 241:) 235:( 223:) 217:( 212:) 208:( 190:. 161:) 155:( 150:) 146:( 136:· 129:· 122:· 115:· 88:. 63:) 59:( 20:)

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Draft (ship)
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verification
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"Draft" hull
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ship measurements

Cutty Sark
ship
waterline
hull
propellers
keel

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