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Change of Aspect Ratio with Incidence
By Equation (8.38), we have:
, CL
a = “o + ПЖ.
Also the induced drag coefficient, by Equation (8.8), is:
 |
C2
 |
 |
Hence, if the aspect ratio is reduced to JR and if the ‘primes’ refer to the new aerofoil with the same incidence, we have:
Thus for a given lift curve, decrease of aspect ratio increases both the geometrical incidence and the induced drag coefficient.
