In many relations the ratio of aerodynamic coefficients in level flight decides the quality of the particular flight condition. The graph below shows the variation of the coefficients and ratios with velocity in level flight at sea level for a hypothetical aircraft.
The parameter values for the aircraft are
Weight : 22,500 lb ,
Altitude : sea level
Span :55 ft.
Planform area : 480 ft2,
Span efficiency : 0.90,
Cd0 = 0.021;
The maximum values for the different ratios occur at different speeds