Fig. 16. Lift coefficients as functions of time for a two-winged clap and fling stroke. The letters i–viii along the x axis correspond to the times the streamlined plots labelled i–viii in Fig. 15A,C were drawn. The angle of attack during pure translation was set to 45°. The Reynolds number (Re) was varied by changing the translational velocity of the wing from 0.00375 to 0.06 m s^–1. In general, lift coefficients were larger at higher Re during the initial upstroke. Lift coefficients, however, were smaller at higher Re during fling and subsequent translation. For Re=64 and higher, lift coefficients peak during translational acceleration and rotation. Lift coefficients drop when the leading edge vortices separate from the wings (vii–viii). For Re=32 and below, lift coefficients also peak during translational acceleration and rotation. Lift coefficients are relatively constant during translation in the first half-stroke (i–iii). Lift coefficients are transiently augmented during translation after fling (vi–viii).