Bird flight inspired Leonardo da Vinci’s flapping-wing flying-machine design.
Leonardo studied birds closely while investigating human flight. His ornithopter concepts used wings that would flap through mechanical action, imitating the movement of a bird’s wings. The word ornithopter comes from Greek roots meaning bird and wing.
Leonardo’s notebooks contain drawings of wing structures, joints, and force-producing mechanisms. He recognized that a flying machine needed to account for lift, balance, and the changing shape of a wing during a stroke. Some of his designs were intended to be powered by a person using pedals, levers, or other mechanical linkages.
Leonardo did not build a successful powered ornithopter. Human muscles cannot produce enough sustained power for a machine of the required size using the materials available to him. His work nevertheless connected careful observation of animal anatomy with engineering, helping establish the study of biological flight as a source of technological ideas.