Quote:
Originally Posted by Patrick
I don't know where this equation came from, but the H+W+H x L portion seems to be calculating the surface area of the car. If so, shouldn't there be another W for the bottom of the car? Or is that just ignored for the equation?
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Patrick, this equation is from Daugherty's Fluid Mechanics text.
The 'mirror image' surface below ground is ignored.
The 'bottom' surface of the vehicle is ignored ( it will be a component of the pressure drag ).
Only the above the belly perimeter ( sides and top ) along with length are used in the surface area.