Textbooks on swimming technique say that the palm 5hou 瓢 d mQve along Sshaped curve in order to get large thrust and high eficiency . It is also said that propening force is produced mainly by 且 ift acting on palm . This report shows how ] ift and drag con 面 butes to propelling force in crawl strokes from an eugineer } ng point of view . It is fundamenta1 且 y based on three −dimensional wing theory fbr 晝 arge aspect ratio wing . Modifications tO that theory are done, because palm , whose hydrodynamic force is considered , has a small aspect ratio . The positions of shoulder , elbow and wrist are cQnsidered to be given, and the target Qf this report is to find the best direction of pa 亘 m to get maximum thrust at every insし ance . The results show むhat drag pays more important role than conside 陀 d be 董 bre, Guide to wrist twist and bend is a [ so given .
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