A Study on the Passive Pitching and Lift Generation in Crane-Fly\u27s Flight

In this study, we evaluated the lift force generated by the crane-fly\u27s flapping wing with the passive pitching using the dynamically scaled model. Since the wing and the surrounding fluid interact with each other, the dynamic similarity between the model and actual crane-fly flights was measured using not only the Reynolds and Strouhal numbers but also the mass and Cauchy numbers. Although there existed the defference between the mass number due to the constant acceleration of the gravity, but the lift coefficient similated by our model indicated that the flapping wing with the passive pitching produces the enough lift force to supprt the crane-fly\u27s weight