JOURNEY IN AERONAUTICAL
RESEARCH: A Career at NASA Langley Research Center
Monographs in
Aerospace History, Number 12
FIGURE 9.5. Amplitude and phase angle
of the circulatory lift of elliptical wings resulting from a
sinusoidal change in angle of attack, represented as the vector 
as functions
of 
b/V, where is the frequency in radians per
second, b is the wingspan, and V is the airspeed.
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