The cd value is the aerodynamic drag coefficient. It is used as a comparative value to assess the aerodynamic efficiency of the shape of a body. Since this value is a 'coefficient', it is dimensionless. It is calculated from the force measured as a constant speed and the projected surface (frontal area) of the object being measured. The lower the cd value, the more smoothly the vehicle passes through the surrounding air. (See also:
aerodynamic drag.)
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