A sketch by Leonardo da Vinci of a flying machine known as the "helical air screw" or the "airscrew". It was designed to compress air to obtain flight, similar to modern helicopters.

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Helical Air Screw or Helicopter, Leonardo Da Vinci

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Size: 5246px × 3628px
Location:
Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
Model Released: No

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