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Old 04-16-2011, 05:58 PM   #100 (permalink)
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plan-taper = 12 % drag reduction

I gleaned an article about Volvo's 3CC concept coupe from the Feb.2005 Popular Science,p. 17.
This car has a roofline of generous plan-taper which Volvo credits with a 12 % drag reduction.
Since my cover has this taper and gave a 13% mpg improvement,the article helps explain the difference between Ford's 10 % straight-sided aero-shell of 1988.
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