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Fig. 11. Drag coefficients are plotted as functions of time for a two-winged fling
half-stroke. The letters i–vi along the x axis correspond to
the times the streamlined plots labelled i–vi in
Fig. 7A,C were drawn. The
angles of attack during pure translation were set to 45°. Reynolds number
(Re) was varied by changing the translational velocity of the wing
from 0.00375 to 0.06 m s–1. The first large peak corresponds
to drag generated during wing rotation. The second smaller peak corresponds to
drag forces generated during translational acceleration. Drag coefficients
increase with decreasing Re. This inverse relationship is
particularly significant during the initial wing rotation.
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