Which concept sketched in the 1480s is considered the direct precursor to the modern helicopter?
Answer
Helical Airscrew
The Helical Airscrew, featuring a single, screw-shaped blade, is universally recognized as the direct precursor to the modern helicopter.
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Thousands of Pages of Inventions, Ideas and Flying Machines | PBS
I made all of Da Vinci's Inventions! - YouTube
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