Here we study the flapping of a dragonfly’s wing section where the frequency of the wing flapping is about 25–30 HZ. We have translational and rotational velocities in a single stroke. In this article we investigate dragonfly’s 2D sections and we want to study the effect of the corrugations during unsteady flight at low Reynolds number. We find that in contrast to the published results for steady flow over the wings, where the corrugation seems to have improved the performance over a profiled wing-section, here a simple flat plate seems to perform better than the corrugated one. However, the corrugated wing-sections have a better aerodynamic performance than the traditional profiled wing-sections. The flow Reynolds number in this study is 8000.

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