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Look at this chart from Cervelo.com and compare the square crossection at the top to the half-oval (fourth item down). 40 times the drag of a 3:1 airfoil as opposed to 6 times for the half-oval. That's a 40/6 = 6.67 times improvement.
Last edited by Patrick; 10-14-2011 at 09:55 PM..
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