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Helicopter flying machine, Leonardo da Vinci

Helicopter concepts by Leonardo da Vinci.

Prototype Helicopter Leonardo Da Vinci

from BBC News

The history of the future in 10 images

Da Vincis helicopter sketch

Leonardo da Vinci Exhibit | Air Screw ~ Leonardo da Vinci was fascinated with the form of the spiral. His helicopter takes the form of an aerial screw, following the example of a device earlier brought to Europe from Asia in the form of a children's toy. Unfortunately, humans alone cannot generate enough lift to raise this heavy machine off the ground.

an early helicopter model based on drawings by Leonardo da Vinci

Leonardo Da Vincis Stempunk helicopter - Worth1000 Contests

Prevalent in the major works of Leonardo Da Vinci and underlying many of his design compositions, is the phi relationship (also known as the Golden Ratio or the Golden Mean), a ratio of approximately 1:1.618, found in nature and creation, and inherent in the Fibonacci sequence. The Golden Rectangle, the Golden Triangle, and the Golden Pyramid, all based on the Golden Ratio are all appear prominent in the work of Leonardo Da Vinci. He referred to the Golden Ratio as the "divine proportion".

Da Vinci's helicopter by Rafael Kage, via Flickr

davinci-aerialscrew - Google Search