The experiments on the aeroelastic characteristics of the flight feathers on the pigeon wing were conducted in a small low-turbulence wind tunnel. The test feather was mounted on an airfoil-shaped supporter, and it was subjected to the uniform smooth air flow. The time-dependent amplitudes of the flight feather were measured with the optical displacement detector system. It was found that the flow-induced self-excited oscillation of the flight feather occurs at the value above the critical Reynolds number. The bending characteristics of the flight feather in the smooth wind were also examined. With respect to the structure of the flight feather, the pigeon feathers were observed microscopically using the scanning electron microscope.
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