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boat tails
Think canoe,kayak.And your correct,America's Cup yachts use an International Canoe Hull.Catamarans,bingo! Also Yale racing sculls,sweeps.Torpedoes,submarines.The last 15% of a hull can be chopped off without alot of form drag increase and the skin-friction drag reduction is significant,since water is over 800 times more dense than air and much more viscous.Remove the tail from a wing and drag goes up 900 %.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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