Leonardo da Vinci designed an ornithopter, a wing-powered aircraft modeled on a bird’s flight.
Leonardo studied birds, bats, and the movement of their wings while developing flying-machine sketches in the late fifteenth and early sixteenth centuries. His ornithopter designs generally placed a human pilot in a frame with large wings moved by pedals, levers, or other mechanical linkages.
The word ornithopter comes from Greek roots meaning bird and wing. Unlike a glider, which remains airborne with fixed wings, an ornithopter seeks lift through flapping wings. Leonardo understood that human muscles alone would not easily match the power-to-weight ratio of birds, but he continued investigating wing shape, balance, and air resistance.
No Leonardo ornithopter achieved powered flight. Later aircraft designers increasingly adopted fixed wings, propellers, and engines. Leonardo’s work remains important because it treated flight as a subject for observation, measurement, and mechanical experimentation rather than mythology.