Leonardo da Vinci designed an ornithopter, an aircraft intended to fly by flapping wings like a bird.
Leonardo studied birds extensively and filled his notebooks with observations about wing shape, balance, air resistance, and movement. His proposed machine used a human pilot’s muscular effort to operate large wings, although the design could not realistically generate enough power for sustained flight.
An ornithopter is different from a helicopter or a conventional airplane. Helicopters produce lift with rotating blades, while airplanes use fixed wings and forward motion. Leonardo’s sketches belong to the long history of attempts to imitate animal flight mechanically.
Leonardo did not build a successful powered ornithopter. His work was nevertheless important because it treated flight as a problem of anatomy, mechanics, and aerodynamics rather than pure imagination. Modern ornithopters exist as small experimental aircraft and models, but they do not validate the practical feasibility of Leonardo’s human-powered concept.