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Phil, thanks for your input.
I'm surprised by the 5% max blockage as the A2 wind tunnel clearly is smaller than 200 square feet, yet they do testing for cars.
Anyway, even with the smallish 120 square feet tunnel I had in mind, 100kw ac engines apparengly go for more than $5k each. So it would turn out a bit expensive for a toy.
Cd, even if I was in the states I would certainly not pay for wind tunnel time. Their cousin tunnel, the AeroDyn wind tunnel, with pretty much the same dimensions charges $1590/hour.
I guess I'd be better off designing a camera rig that could be easily adapted between cars to film tufts testing.
Tufts are nice, but they don't tell you what the drag is with or without the aeromod you're testing.
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