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Once he realised the inadequacy of human power, he turned his attention to the flight of birds. Thus then, within a short time, he discovered that birds rely less on beating their wings than on the exploitation of air currents and winds. He examined how birds, when struck by air currents, manage to keep their balance by moving their wings and tails. He also made anatomical studies of bird wings, learning how they were able to use their wings as brakes. Eventually his investigations led to a decision to substitute sail-flight projects for flapping-wing machines.
Leonardo sketched several types of flying machines: helical wing, beating wings, parachute, and bat’s wings. Though real life trial and error Da Vinci learned the difficulty of realising his great dream of flying in a machine powered by human propulsion, and turned his talents toward the problem of gliding flight.