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Answer was already there. Miniature full size truck is 100mmx150mm=15000mm2=0.015m2
with that 5% rule I get cross sectional area of 300000mm2=0.3m2=3.3 square feet.
In cross sectional dimensions this means 450mmx665mm
That was good tip to make that tunnel portable. There is only one problem you should be able to put that car you are measuring on the side of your car. Otherwise your cars aerodynamics would influence to the cars you are measuring?
Can then some verify that same cross sectional rules apply to water tunnels?
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