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Old 03-13-2009, 02:25 PM   #5 (permalink)
Piwoslaw
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Join Date: Oct 2008
Location: Warsaw, Poland
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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Quote:
Originally Posted by wyatt View Post
You will see a difference, but it's not because the Cd or Crr is different, it's because the Cs (coefficient of skin friction) isn't taken into accuont with coast down tests.
Say that instead of starting at 95 km/h you start at 120 m/h. For a certain time you will be going faster than 95, so the air drag on the surface of car will be greater. This friction will cause the surface to become hotter, creating a "warmth bubble" of hot, rarified air around the car. In the right conditions, this "bubble" will have zero resistance on the car, letting you coast indefinitely.
Just kidding ;P
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e·co·mod·ding: the art of turning vehicles into what they should be

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