What type of flight did Leonardo da Vinci’s aerial screw seek to achieve?

Leonardo da Vinci’s aerial screw sought to achieve vertical flight.

Leonardo drew the aerial screw in a manuscript dating from about 1489. The design showed a large helical surface wrapped around a central mast. He reasoned that if the screw rotated quickly enough, its spiral surface might press against the air and lift the machine upward.

The sketch is frequently compared with a modern helicopter rotor, but the mechanisms are not the same. Leonardo’s concept lacked an engine, a practical rotor system, and a demonstrated method for producing enough power. The proposed frame was also too heavy for the materials and technology available in his time.

The aerial screw is therefore best understood as a theoretical flight machine. It is an influential example of Leonardo applying observations of screws, air, and mechanical motion to the problem of human flight.