Calculation of Induced Drag
For a wing with an elliptical lift distribution, induced drag is calculated as follows:
where
- and
Thus
Hence
Where:
- is the aspect ratio,
- is the induced drag coefficient (see Lifting-line theory),
- is the lift coefficient,
- is the induced drag,
- is the wing span efficiency value by which the induced drag exceeds that of an elliptical lift distribution, typically 0.85 to 0.95,
- is the lift,
- is the gross wing area: the product of the wing span and the Mean Aerodynamic Chord.
- is the true airspeed,
- is the equivalent airspeed,
- is the air density and
- is 1.225 kg/m³, the air density at sea level, ISA conditions.
Read more about this topic: Lift-induced Drag
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