Discussion
If \(c_l\) is doubled while \(c_d\) rises from \(0.008\) to \(0.020\), the lift-to-drag ratio changes from 100 to
Answer: C
The new ratio is \(1.6/0.020 = 80\). Lift has doubled but drag has risen by a factor of two and a half, so the ratio falls despite the extra lift, which is why maximum lift-to-drag occurs at a particular moderate incidence.
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