Knowledge (XXG)

Oar

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a distance of about 450 millimetres (18 in) or to drill an 18-millimetre (0.71 in) hole inside the handle for a distance of about 150 millimetres (5.9 in) and add about 12 oz of lead secured by epoxy resin glue. For a 7-foot (2.1 m) oar the balance point is about 12 inches outboard of the rowlock. Often surplus wood is removed from the blade's width and thickness and at the neck between the blade and the shaft to further reduce outboard weight. As the rower is expending less energy accelerating the (now-reduced) mass of the oar back-and-forth, and will experience less fatigue constantly exerting downward force on the handle (vs. an unbalanced version) -- this type of oar is more efficient and thus preferable for long-range rowing.
244: 315: 27: 284: 61:, or a thole. The oar is placed in the pivot point with a short portion inside the vessel, and a much larger portion outside. The rower pulls on the short end of the oar, while the long end is in the water. By contrast, paddles are held in both hands by the paddler, and are not attached to the vessel. 200:
This is a normal, usually wooden oar to which weight has been added at the inboard end so that the blade end is noticeably lighter and easier for a rower to operate without fatigue. The two methods of adding weight are to either have a much larger section in the oar immediately next to the handle for
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Oars have traditionally been made of wood. The form is a long shaft (or loom) with a flat blade on the end. Where the oar connects to the boat there is a "collar" (or button), often made of leather, which stops the oar slipping past the rowlock. Oars usually have a handle about 150mm long, which may
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The sport of competitive rowing has developed a tradition of using an oar as a memento of significant race wins. A 'trophy oar' is not presented at the end of the race as a more familiar precious metal cup might be, but rather given by the club, school or university that the winning crew or rower
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A trophy oar is a competition oar that has been painted in the club colours and has then had the details of the race signwritten on the face of the blade. The most common format has the coat of arms or crest of the club or school positioned in the centre, with the crew names and the race details
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lever. The oar is fixed in the oarlock, the rower pulls on the handle, and the blade moves in the opposite direction to propel the boat. The blade is further from the oarlock than the rower's hands. So, the heavy force of a short rowing motion becomes a smaller force over a greater distance.
180:, planted in the water. The rower pulls on the handle and the boat moves along with them. The "Class II" perspective is important to competitive rowing. Effective rowers learn to lever the boat past the end of the blade, rather than pulling the blade through the water. The 191:
of the oar depends on the length of the oar from the oarlock to the blade, compared to the length from the oarlock to the rower's hand(s). The further away from the oarlock the blade is, the more difficult it is to row and the more distance each stroke will move.
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Both the Class I and Class II perspectives can be used to calculate the forces on the rower, boat, and water, with equivalent results. The calculations are simpler for the Class I perspective. The
259:. While rowing, the oars are supported by metal frames attached to the side of the boat called riggers, while the oar fits into the oarlocks at the ends of each rigger. Classic oars were made of 83:, or by the mechanical work of rowers, or by paddlers. It is common for an oar propelled vessel to also have the option to be powered by sail, both in antiquity (for instance the 255:
are long (250–300 cm) poles with one flat end about 50 cm long and 25 cm wide, called the blade. The part of the oar the oarsman holds while rowing is called the
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for example, as well as Yale and Harvard) and their colleges have long histories of using the trophy oar and many examples are on display in club houses around the world.
229:, in the great ship of Ptolemy the oars of the upper tier were over 50 feet (15 m) in length with handles leaded so as to equalize the weight inboard and outboard. 659: 569: 2417: 2158: 1754: 122: 2373: 1882: 553: 2205: 1656: 440: 652: 336:
Oars have been used to describe various animals with characteristics that closely resemble the said rowing implement. The members of the
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of the vessel, reach towards the stern, and insert the blade of their oar in the water. As they lean back, towards the vessel's
2524: 2402: 1793: 831: 645: 577: 2015: 1545: 805: 2010: 1550: 1023: 111:, in modern China. In 1999, an oar measuring 63.4 cm (2 ft) in length, dating from 4000 BC, was unearthed in 976: 72:, the blade of their oars pivots in the oarlock, and the end in the water moves towards the stern, providing forward 873: 2514: 2278: 2079: 2519: 1990: 1899: 2273: 1365: 910: 2390: 2300: 1472: 1239: 1058: 991: 723: 513: 181: 2478: 2352: 1958: 1849: 1837: 1533: 1274: 1113: 750: 684: 668: 217:
were propelled by very long oars that might have several oarsmen per oar. These oars could be more than a
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This article is about the implement used for water-borne propulsion. For other uses, see
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Scientific and Common Names of the Reptiles and Amphibians of North America – Explained
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Chinese Maritime Activities and Socioeconomic Development, c. 2100 B.C.-1900 A.D.
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The oars used for transport come in a variety of sizes. The oars used in small
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be a material sleeve or alternatively an ovoid shape carved to fit the hands.
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or rafts can be less than 2 metres long. In classical times
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because their body shape is similar to that of an oar. The
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A pair of carbon fibre sculling oars used for sport rowing
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Trophy oars of the seven founding member clubs of the
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For thousands of years vessels were powered either by
529:...using oars as simple levers of the second order... 172:
From an observer on the shore, the oar is instead a
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Stark (15 April 2008). 325:The Norwegian municipalities of 267:material, the most common being 263:, but modern oars are made from 233:Oars used for competitive rowing 176:lever. Here, the fulcrum is the 45:The difference between oars and 2403:Evolutionary origin of religion 352:is derived from the Greek root 356:, which roughly translates to 1: 2016:Art of the Middle Paleolithic 1546:British megalith architecture 57:point for the oar, either an 2011:Art of the Upper Paleolithic 1551:Nordic megalith architecture 411:Westport: Greenwood Press. 2541: 2159:British Isles and Brittany 2080:Gwion Gwion rock paintings 634:, 1775 – 1783 British Navy 471:. Retrieved on 2008-08-13. 236: 221:metres long. According to 64:Rowers generally face the 18: 1844: 1827: 1479: 1466: 928: 745: 732: 675: 488:"Basic Physics of Rowing" 298:Many older universities ( 130:Athletes of the sport of 2391:Evolutionary musicology 1794:Oldest extant buildings 1721:Archaeological features 1240:Prepared-core technique 554:Encyclopædia Britannica 514:World Rowing Federation 467:. (February 10, 1999). 205:Oars used for transport 182:World Rowing Federation 30:Traditional wooden oars 2525:Water sports equipment 2353:Unchambered long cairn 2201:Mound Builders culture 1534:Neolithic architecture 669:Prehistoric technology 541:Warre, Edmond (1911). 322: 295:arranged around this. 291: 248: 135: 97:early Neolithic period 31: 2028:List of Stone Age art 1230:Microblade technology 1178:Langdale axe industry 776:Ard / plough 317: 286: 275:Oars used as trophies 246: 129: 87:) and more recently. 29: 2435:Prehistoric medicine 2430:Prehistoric counting 2413:Prehistoric religion 2408:Paleolithic religion 2386:Behavioral modernity 1743:Causewayed enclosure 1635:Abri de la Madeleine 759:Neolithic Revolution 407:Deng, Gang. (1997). 189:mechanical advantage 21:OAR (disambiguation) 2474:Prehistoric warfare 1220:Magdalenian culture 1183:Levallois technique 1114:Earliest toolmaking 580:on October 22, 2013 574:National Geographic 432:Archaeology of Asia 113:Ishikawa Prefecture 2425:Origin of language 2418:Spiritual drug use 2328:Rectangular dolmen 2230:Dartmoor kistvaens 2043:Carved stone balls 1755:Circular enclosure 1714:Other architecture 1657:Alp pile dwellings 1245:Solutrean industry 1156:Gravettian culture 806:Secondary products 374:Oar (sport rowing) 338:Family Regalecidae 323: 292: 253:competitive rowing 249: 239:Oar (sport rowing) 162:frame of reference 136: 32: 2515:Marine propulsion 2502: 2501: 2498: 2497: 2494: 2493: 2447:Prehistoric music 2396:music archaeology 2053:Cup and ring mark 1878:Clothing/textiles 1823: 1822: 1819: 1818: 1462: 1461: 1458: 1457: 1265:Yubetsu technique 1250:Striking platform 1215:Lithic technology 1100: 1099: 1085:Game drive system 1004:Projectile points 896:Mortar and pestle 492:Physics of Rowing 442:978-1-4051-5303-4 251:The oars used in 127: 2532: 2520:Rowing equipment 2462:Divje Babe flute 2369:Archaeoastronomy 2112:Petrosomatoglyph 1846: 1829: 1678:Water management 1481: 1468: 1371:Denticulate tool 1193:Lithic reduction 926: 747: 734: 662: 655: 648: 639: 619: 618: 616: 615: 596: 590: 589: 587: 585: 576:. 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931: 930: 927: 924: 922: 918: 912: 909: 907: 904: 902: 899: 897: 894: 892: 889: 887: 884: 880: 877: 875: 872: 871: 870: 867: 865: 862: 860: 859:Grinding slab 857: 855: 852: 848: 845: 844: 843: 840: 838: 835: 833: 830: 829: 827: 823: 817: 814: 812: 809: 807: 804: 802: 799: 797: 794: 792: 791:Domestication 789: 787: 786:Digging stick 784: 782: 779: 777: 774: 770: 767: 765: 764:Founder crops 762: 761: 760: 757: 756: 754: 752: 748: 744: 740: 735: 731: 725: 722: 718: 715: 714: 713: 710: 706: 705:New Stone Age 703: 701: 698: 696: 693: 691: 688: 686: 683: 682: 681: 678: 677: 674: 670: 663: 658: 656: 651: 649: 644: 643: 640: 633: 632:Oar positions 630: 629: 625: 609: 605: 601: 595: 592: 579: 575: 571: 564: 561: 556: 555: 550: 545: 537: 534: 530: 519: 515: 509: 506: 493: 489: 486:Dudhia, Anu. 482: 480: 478: 474: 470: 466: 465: 459: 456: 444: 438: 434: 433: 425: 422: 418: 417:0-313-29212-4 414: 410: 404: 401: 394: 390: 387: 385: 382: 380: 377: 375: 372: 371: 367: 365: 363: 359: 355: 351: 347: 343: 339: 334: 332: 328: 321: 316: 309: 307: 305: 301: 296: 290: 289:Remenham Club 285: 281: 280:represented. 274: 272: 270: 266: 262: 258: 254: 245: 240: 232: 230: 228: 224: 220: 216: 212: 204: 202: 195: 193: 190: 185: 183: 179: 175: 170: 167: 163: 159: 155: 147: 145: 138: 133: 116: 114: 110: 106: 102: 98: 90: 88: 86: 82: 77: 75: 71: 67: 62: 60: 56: 52: 48: 43: 41: 37: 28: 22: 2279:wedge-shaped 2264:Funeral pyre 2257:Great dolmen 2213:Chamber tomb 2194:Round barrow 2149:Stone circle 2021:Blombos Cave 1949:Grooved ware 1873:Chalcolithic 1777:Thornborough 1695:Flush toilet 1630:Blombos Cave 1625:Rock shelter 1581:Quiggly hole 1473:Architecture 1448:illustration 1341: 1090:Buffalo jump 911:Storage pits 874:Aşıklı Höyük 864:Ground stone 700:Subdivisions 612:. Retrieved 610:. ebeltz.net 607: 600:Beltz, Ellin 594: 582:. Retrieved 578:the original 573: 563: 552: 536: 528: 521:. Retrieved 508: 496:. Retrieved 491: 462: 458: 446:. Retrieved 431: 424: 408: 403: 384:Steering oar 357: 353: 350:Eretmochelys 348:'s genus of 335: 324: 297: 293: 278: 269:carbon fibre 250: 208: 199: 196:Balanced oar 186: 177: 173: 171: 165: 151: 142: 139:Construction 94: 78: 63: 44: 35: 33: 2301:unchambered 2296:Long barrow 2286:Grave goods 2242:Court cairn 2237:Clava cairn 2189:Bowl barrow 2127:Rock cupule 2070:Golden hats 2063:Hill figure 1964:Unstan ware 1944:Cord-marked 1809:Sweet Track 1731:Burnt mound 1652:Stilt house 1640:Sibudu Cave 1433:Tally stick 1401:Quern-stone 1386:Hammerstone 1376:Fire plough 1347:Pesse canoe 1305:Bannerstone 1275:Other tools 1188:Lithic core 1136:Aurignacian 1024:Bare Island 906:Quern-stone 544:"Oar"  2509:Categories 2440:trepanning 2333:Ring cairn 2291:Jar burial 2274:transepted 2206:U.S. sites 2107:Petroglyph 2033:Bird stone 1991:wine press 1664:Stone roof 1647:Roundhouse 1539:long house 1516:Stonehenge 1484:Ceremonial 1428:Stone tool 1255:Tool stone 1225:Metallurgy 1129:Mousterian 1106:Toolmaking 1044:Cumberland 1017:Transverse 987:Schöningen 879:Qesem cave 847:Earth oven 801:Irrigation 712:Technology 680:Prehistory 614:2007-02-06 523:17 October 498:17 October 395:References 310:In culture 223:Callixenus 40:propulsion 2484:symbolism 2348:Tor cairn 2306:Grønsalen 2247:Cremation 2139:Sculpture 2117:Pictogram 2102:Petroform 1922:amber use 1890:Cosmetics 1700:Reservoir 1685:Check dam 1615:Pueblitos 1610:Pit-house 1593:Longhouse 1527:Dwellings 1396:Microlith 1327:Bow drill 1322:Bone tool 1315:prismatic 1124:Acheulean 1039:Cresswell 1012:Arrowhead 938:Boomerang 854:Granaries 816:Terracing 695:Stone Age 448:5 October 320:Enonkoski 304:Cambridge 265:synthetic 227:Athenaeus 152:Oars are 115:, Japan. 2122:Rock art 2085:painting 2058:Geoglyph 1883:timeline 1863:Beadwork 1603:Mehrgarh 1598:Mudbrick 1506:megalith 1381:Fire-saw 1203:debitage 1198:analysis 1166:Hand axe 1146:Cupstone 724:Glossary 685:Timeline 419:, p. 22. 379:Sculling 368:See also 362:flippers 215:warships 211:dinghies 174:Class II 156:. Which 109:Zhejiang 103:site at 2479:Symbols 2090:pigment 1976:Weaving 1939:Cardium 1934:Pottery 1929:Mirrors 1917:Jewelry 1858:Baskets 1838:culture 1690:Cistern 1496:Pyramid 1438:Weapons 1416:Scraper 1406:Racloir 1366:Cleaver 1354:Chopper 1260:Uniface 1171:Grooves 1161:Hafting 1119:Oldowan 1078:Systems 1029:Cascade 992:woomera 982:harpoon 955:history 921:Hunting 901:Pottery 842:Cooking 751:Farming 717:history 690:Outline 584:2 March 551:(ed.). 342:oarfish 166:Class I 148:Physics 91:History 59:oarlock 47:paddles 2457:flutes 2252:Dolmen 2176:Burial 1986:winery 1959:Linear 1789:Midden 1767:Cursus 1760:Goseck 1620:Pueblo 1571:Dugout 1556:Burdei 1235:Mining 1059:Lamoka 1054:Folsom 1034:Clovis 891:Metate 869:Hearth 837:Basket 811:Sickle 439:  415:  389:Paddle 354:eretmo 300:Oxford 257:handle 154:levers 132:rowing 85:galley 74:thrust 51:rowing 2374:sites 2318:Mummy 2038:Cairn 1954:Jōmon 1905:shoes 1900:Hides 1772:Henge 1726:Broch 1588:Jacal 1443:Wheel 1391:Knife 1337:Canoe 1332:Burin 1310:Blade 1208:flake 1069:Plano 977:baton 967:Spear 933:Arrow 886:Manos 739:Tools 547:. In 331:Herøy 327:Fedje 219:dozen 178:blade 105:Yuyao 81:sails 66:stern 55:pivot 2467:gudi 2225:Cist 2154:list 1981:Wine 1910:Ötzi 1895:Glue 1868:Beds 1836:and 1834:Arts 1705:Well 1561:Cave 1491:Kiva 1421:side 1411:Rope 1359:tool 1293:bone 1283:Adze 1049:Eden 962:Nets 832:Fire 796:Goad 781:Celt 586:2017 525:2021 500:2021 450:2012 437:ISBN 413:ISBN 329:and 302:and 261:wood 1576:Hut 1511:row 1342:Oar 1300:Axe 1288:Awl 358:oar 70:bow 36:oar 34:An 2511:: 606:. 602:. 572:. 527:. 516:. 490:. 476:^ 364:. 271:. 107:, 76:. 661:e 654:t 647:v 617:. 588:. 502:. 452:. 23:.

Index

OAR (disambiguation)

propulsion
paddles
rowing
pivot
oarlock
stern
bow
thrust
sails
galley
early Neolithic period
Hemudu culture
Yuyao
Zhejiang
Ishikawa Prefecture
rowing
levers
class of lever
frame of reference
World Rowing Federation
mechanical advantage
dinghies
warships
dozen
Callixenus
Athenaeus
Oar (sport rowing)

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