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The effects of chordwise wing optimization of single-winged samara in autorotation

Single-winged rotating aerial vehicles such as monocopters have recently gained popularity, due to the development of small and powerful mechanical actuators and lightweight electronic sensors. Even though monocopters have to rely on their single wings for the total lift generation, few have looked into an efficient wing design for monocopters. In this paper, a chordwise optimization of wing design for single-winged samara in autorotative flight is presented. The resulting wing design has been tested in a numerical simulation and verified in a vertical wind tunnel, as well as with drop tests in a high-speed camera-based motion capture system. The wing is further equipped with an actuator to change angle of attack during flight, which has an effect of softening the landing at the end of the autorotation.