In Dr. Ing. Ferdinando Gale's book, Aerodynamics Of Radioguided Sailplanes,
(and in Theory of wing sections), the formula on p. 69 states that :Cdi=Cl
squared/pi x ARw for AR of infinite aspect ratio, and Cln/pi
x{(1/ARn)-(1/ARw)} for data obtained from a smaller aspect ratio than the
actual wing. Yet on p. 74 and the excercise on B-3 prob. B-9, the formula is
stated as 2x these fromulas. As this coefficient is needed in order to
obtain the over all drag of the airframe, which is the proper formula? Or am
I just missing something obvious?
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