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.