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The polymath thought that if a screw-like structure can rotate fast enough, it will 'drill' into the air and fly.
Leonardo based the design of the flapping wing on birds' wings and a faulty hypothesis.
Leonardo's creative legacy also includes several projects related to bridges. This unusual swing bridge allowed for undisturbed water traffic.
The mechanical wing is one of the masterpieces among Leonardo's sketches related to aviation.
A medieval glider constructed by Abbas Ibn Firnas.