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Aerodynamic coefficients plays an important role in performance analysis as well as design of aeroplanes.Coefficient of lift is defined as Lift divided by dynamic pressure, L/{q_\infty }S where as drag coefficient is defined as Drag divided by dynamic pressure, D/{q_\infty }S .
Coefficient of lift,maximum or {C_{L,\max }} is the determining factor for stalling velocity of aircraft.The higher is the {C_{L,\max }} the lower is the stalling velocity.{V_{stall}} = \sqrt {\frac{{2W}}{{{\rho _\infty }S{C_{L,\max }}}}}
Therefore,aerodynamic coefficients are important engineering quantities for determining the stalling velocity by {C_{L,\max }} and maximum velocity by {C_{D,\min }} .
Lift to drag ratio is the measure of aerodynamic efficiency of aircraft .It is given as \frac{L}{D} = \frac{{{q_\infty }S{C_L}}}{{{q_\infty }S{C_D}}} = \frac{{{C_L}}}{{{C_D}}}
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