What was Leonardo da Vinci’s flying-screw design intended to do?

Leonardo da Vinci’s flying-screw design was intended to rise vertically.

Leonardo sketched the aerial screw in the 1480s, probably around 1489, in a manuscript now associated with the Codex Atlanticus. The design showed a large helical surface wrapped around a central mast. Leonardo reasoned that if the screw were rapidly rotated, the helical surface would press against the air and lift the machine.

The idea is often described as a helicopter ancestor, but it was not a working helicopter. Leonardo’s drawing did not provide a practical engine, lightweight materials, or a complete control system. The proposed frame was also far too heavy for the human-powered mechanism suggested by the sketch. Modern rotorcraft use powered rotor blades rather than a single fabric-covered spiral.

The aerial screw nevertheless became one of Leonardo’s best-known inventions. Its importance lies in identifying vertical lift as a separate aviation problem, centuries before powered helicopters became feasible. It should not be confused with Leonardo’s ornithopter studies, which sought lift through flapping wings.