Fig. 12. Drag coefficients plotted as functions of time for a one-winged fling half-stroke. The letters i–vi along the x axis correspond to the times the streamlined plots labelled i–vi in Fig. 7B 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 peak corresponds to the drag forces generated during translational acceleration. Note that the drag forces per wing generated during rotation in the one-winged case are significantly smaller than those generated per wing in the two-winged case (see Fig. 11). In general, drag coefficients increase with decreasing Re.