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Fig. 20. The average lift and drag coefficients generated during fling for an entire
fling half-stroke following a clap half-stoke and for an entire fling
half-stroke started from rest as a function of the Reynolds number
(Re). Force coefficients were averaged during wing rotation and a
subsequent translation of about 3.5 chord lengths. Average lift coefficients
increase slightly with decreasing Re. Average drag coefficients
increase significantly as the Re is lowered. Force coefficients are
higher for fling half-strokes that follow clap half-strokes as the wings move
back through their wakes. This `wake capture' effect decreases with decreasing
Re.
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