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Two french inventors invented a toy with a fixed rotary wing that was similar to a helicopter
THE FIRST DESIGN OF the HELICOPTER WAS DESIGNED BY Leonardo DA VINCI
The basic idea of a helicopter flight through rotating horizontal wings goes back at least 1,500 years, through a simple invention known as the Chinese top" that still survives today in various forms. This is a toy with a rotor blade mounted on a stick, and spinning the stick between the palms of the hands or by pulling a string wound around it causes it to soar into the air. The toy eventually made its way from China to Europe, where it appeared in paintings dating as far back as 1463. Not long after that, in 1483, Leonardo da Vinci illustrated a more sophisticated "rotary-wing" toy in his famous notebooks. However, building a rotary-wing aircraft that was any more than a toy was beyond the technology of the time, and remained so for centuries
leonardo da vinci worked on sketches of the screw- like machine
The evolution of helicopters
Otto
wright brothers
Samuel
Igor Sikorsky and Vought-Sikorsky September 14, 1939
the helicopter was the first to use a single main rotor and tail rotor design. While piloted by Igor the first attempt lasted only for a few seconds. The first free flight took place on May 13, 1940. The innovative 28-foot diameter, three-blade rotor allowed for variable pitch of the blades with a blade speed of 250 to 300 mph.The concepts demonstrated in the VS-300 provided the basis for the first production helicopters and became the standard for helicopter manufacturing across the world.
IGOR
REFERENCE
http://connecticuthistory.org/worlds-first-helicopter-today-in-history/
http://www.da-vinci-inventions.com/aerial-screw.aspx
http://terpconnect.umd.edu/~leishman/Aero/history.html