Quote:
Originally Posted by winkosmosis
Yeah and at the rear the smoke stream always follows a nice smooth gradual curve downward and rearward. Put a brick in the wind tunnel and you'll see the same thing. Works great for advertising materials!
![](http://cdn-www.greencar.com/images/5-facts-vehicle-aerodynamics/wind-tunnel.jpg)
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You realize of course that the sharp-edged brick would have fully separated flow and Cd 0.85,yes?