flapping_wind_machine.jpgaerial_screw.jpg
The aerial screw was built by Leonardo da Vinci. In the later
years people said that it was the first ever drawing of the first
helicopter. He used paper as the propellers. He also used house hold item just to simulate actual flight. He couldn't sustain the srew in the air butthat was the first drawing of an acutal air mobeal.( on the right side)

This is another design of the fighting machine. Though his
time period he tried to master the perfect flying invention this one used the pull system to simulate a flying part he later realized that in able for it to work it need it to be metal for it be stable because eventually it wouldn't be able to hold an actual persons weight. It would eventually break and crumble.(on the left side)