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Old 09-04-2009, 10:23 AM   #6 (permalink)
Aero Wannabe
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Join Date: Dec 2007
Location: NW Colo
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TDi - '04 VW Golf
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The proper angle has to do with the relationship between the roof of the car and the Kammback and that doesn't change whether loaded or not. The fact that it is bowing up in the middle suggests that you have created an airplane wing and you DO have attached flow. As others have suggested you are creating lift, but also reducing the size of your trailing wake. Are you driving to set a land speed record or driving for economy? Driven conservatively, gravity will keep your tires in contact with the road
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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