Abstract
In general, flexible plastic wings are the primary components of small lightweight aircrafts such as unmanned aerial vehicles (UAVs). One of the authors has shown that the torsional oscillation of a plastic wing occurs in a certain range of its attack angle, which causes a rise in lift of the wing. However, the conditions under which the wing exhibits the high-lift characteristics remain unclear. To find out the conditions, the aerodynamics characteristics of the wing are experimentally investigated by changing its rigidity and aspect ratio under various flow speeds in the wind tunnel. The experimental results reveal that the aerodynamic characteristics of flexible wing are dominated by the two dimensionless parameters which are derived from the equation governing the torsional oscillation of the wing.
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