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Old 12-03-2008, 08:45 PM   #3 (permalink)
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Join Date: Dec 2007
Location: Upstate SC
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Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
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90 day: 55.14 mpg (US)
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The Cd would go up because you'd have quadrupled the size of the recirculation eddy trailing the car.

When I first built my prototype boattail, it was cut off at the point where the back edge of my hatch glazing is now, then later I added a tail cone to complete the boattail (see pics in my Photobucket site). I got a noticeable increase in coasting performance when I went from the partial to the full boattail. There's a reason you don't see subsonic aircraft flying around with kammbacked boattails, its called increased drag.

Last edited by basjoos; 12-03-2008 at 08:53 PM..
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