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General Aviation Aircraft Design by Snorri Gudmundsson

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Since LW = qSrefCLW, solving for CLW yields:

image (i)

The minimum lift-induced drag is generated when the HT generates no (or negligible) balancing force. This happens when the weight is precisely at the aerodynamic center. In that case, the lift-induced drag (using the simplified drag model) is given by:

image (ii)

On the other hand, when balancing force is required, Equation (i) can be used to calculate the higher lift-induced drag, i.e.:

image (iii)

The ...

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