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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.
The aim of this extraordinarily complex study was to mimic the different phases of the flight of birds.
Leonardo's creative legacy also includes several projects related to bridges. This unusual swing bridge allowed for undisturbed water traffic.
A medieval glider constructed by Abbas Ibn Firnas.