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crazytrain said:
What does that number mean, anyway? It has been a few years since I dropped physics as a major.
F_drag=c_d*speed^2

F_drag is the drag force.

This is a good approximation for speeds well below the speed of sound.
 

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one needs to add an area and density to that equation to get drag force

Drag = Cd x rho/2 x Area x Velocity^2
the area is frontal cross section area for automobiles, its the wing planform for airplanes :) ;
rho is .002377 for sea level, .002 for normal warm days.
density is slugs per cubic foot, velocity in feet per second, area in square feet.


Can you tell I are an inguneer :eek:
Take a picture from the front with a big yardstick to get the cross sectional area. I'll try to do that this weekend and post the number here.
 
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