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Several ornithopters use light, powerful motors to stay aloft. Leonardo Da Vinci first proposed a design for human-powered ornithopter in which the human would serve as the engine with a series of pedals and cranks. Although Leonardo Da Vinci never built his ornithopter, it would have been far too heavy to fly. A design that could create lift, as well as a flapping motion may be enough to make an working ornithopter to carry a human possible.