[M_a_t_t]

I am curious as well, but I think it wouldn't be accurate because of "dispersion" (not sure if thats the best description) since it will accelerate in all directions once it leaves the blower and therefore the velocity against the car would be considerable less just a few feet away from the blower. Since you have to consider the car from front to back I don't think this would provide accurate results. Consider side mirror testing. Since you have to have the windshield and fender to have realistic flow, then by the time the air reaches the mirror you would be 2-3 ft away already.

Just thoughts from the arm chair though. Would be awesome to see a comparison.