His drawing for the Helicopter is said to have inspired Igor Sigorsky to invent the modern Helicopter and is also said to have inspired the invention of the screw propellor found on almost all boats. Leonardo da Vinci’s helicopter is a world renowned example of his ability to think centuries ahead of his time. It is the first known drawing of any helicopter-like machine. The ancient Chinese had designs for lighter than air flight, such as hot air balloons and even some wild firework powered machines (some of which are believed to have been tested resulting in the death of the pilot) but nothing similar to a helicopter.
The design was drawn in 1493, 450 years earlier than an actual helicopter would take to the air.