Leonardo da Vinci’s ornithopter design used wing-like structures to imitate a bird’s flight.
An ornithopter is an aircraft designed to fly by flapping its wings, rather than by using fixed wings or a helicopter rotor. Leonardo studied birds extensively and produced several sketches of flapping-wing machines during the late fifteenth and early sixteenth centuries. Some designs placed a human pilot inside a frame connected to broad wings.
Leonardo understood that birds combine wing movement with control of balance, but human muscles cannot provide enough sustained power for a large, heavy machine of this kind. His ornithopter concepts therefore remained designs rather than proven aircraft. They are still historically significant because they apply close observation of nature to an engineering problem.
The word ornithopter comes from Greek roots meaning “bird” and “wing.” Modern experimental ornithopters use engines or other mechanical power, and small radio-controlled versions have flown. They should not be confused with Leonardo’s glider studies, which relied on fixed wings and rising air rather than flapping.