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Answer:
Simply put, the coefficient of drag (Cd) is a way to quantify the various factors that affect, and result in, drag on an aerodynamic object.
See the link below for an excellent discussion of drag coefficient on the NASA website.
An airplane has 4 forces acting upon it and one of them is Drag, a force in the opposite direction of flight. Aeronautical engineers study the forces on a wing but found it easier to use non-dimensional measuresments. Drag is measure in Force (lbs). But Drag Coefficient is a value of force/force. This allows the engineer to produce charts for the numerous airfoil wing designs and have a Drag Coeffecient Chart that can be used for various sizes of wing applications.
First answer by Custermen.
Last edit by Custermen.
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