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Fig. 6. Driven oscillations of artificial flexible and rigid wings. A mechanical lever attached to a servomotor and driven at 50 Hz (A) oscillated a flexible paper plate and a rigid plate made of balsa wood of the same dimensions and weight. Recordings from an anemometer placed near the paper plate (B) and balsa wood plate (C) show that the flexible plate has several frequency peaks for the driving frequency of 50 Hz, whereas the balsa wood plate has only a single peak at exactly 50 Hz.





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