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from what i've seen it' can't be that expensive in comparison to running a wind tunnel. i didn't see to many high tech things involved.
it reminds me of a construction site i saw a while ago. the site was right next to a road and shielded with tall fences covered with some fabric to protect the cars passing right next to it. as a car passed you could see the air push the fabric against the fence. it was as if the car was enclosed in an invisible bubble of air.
would be great if you could see the whole picture like with this technique
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