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Old 12-28-2012, 06:29 PM   #7 (permalink)
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top half

Originally Posted by theycallmeebryan View Post
Shouldn't the top half of the hitch aero box conform to a taper from the roof line (From top down view), instead of the rear fender panel? The top half of the box should look like a miniature version of the silhouette of your car. That is, if you are trying to go for maximum aerodynamic efficiency.
In the plan view layout you want to take advantage of any body camber already present in the host vehicle and then project from there with a contiguous contour extending back using the 'Template' or Mair's boat tail profile.
If the top portion is deleted you'll pay some in extra drag,but 'practicalities' may demand that you stray from the ideal.The missing link should create a locked-vortex of which the outer flow field will skip over.
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