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Cd
From the drag force equation,knowing the frontal area of the test model or vehicle, the local air density,air velocity/Reynolds number in the tunnel,any buoancy or wall correction factors of the tunnel itself,and the actual drag force measured with the scales,sting,or load cells,the coefficient of aerodynamic drag falls out of the equation.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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