When did leonardo da vinci…?
Helicopter: The first studies on helicopters were well in advance of the first airplanes. Leonardo da Vinci is credited with having first thought of a machine for vertical flight, the “airscrew,” the design for which, dated 1493, was only discovered in the 19th century. http://www.aviastar.org/helicopters_eng/… Leonardo’s parachute design consists of sealed linen cloth held open by a pyramid of wooden poles, about seven metres long. The original design was scribbled by Da Vinci in a notebook in 1483. http://www.juliantrubin.com/bigten/davin…
