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Helicopter Theory - Early History
Early helicopter concepts from ancient China to da Vinci and prototype machines of the 19th century.
http://www.aerospaceweb.org/design/helicopter/history.shtml
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Helicopter - Britannica
Aircraft with one or more power-driven horizontal propellers or rotors that enable it to take off and land vertically, to move in any direction, or to remain stationary.
http://www.britannica.com/technology/helicopter
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A History of Helicopters - WSJ
The idea of vertical flight can be traced back to China in approximately 400 B.C., when feathers attached to the end of a stick were rapidly spun between hands and cast into the air. See how much has changed since then.
http://www.wsj.com/articles/SB10001424127887323335404578445232111215150
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A Brief History In Helicopters - Heli Mart
Read About The History Of Helicopters & How They Have Helped Shape The Field Of Search & Rescue. Information On Helicopter Components Helimart.
http://helimart.com/helicopter-resources/history-in-helicopters.html
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History Of Bell Helicopters
History of the helicopter from bell helicopters.
http://www.bellhelicopter.com/History.html
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History of Helicopters
The first successful rotorcraft (Helicopters) was a gyroplane, designed by Sr. Juan de La Cierva in Spain and flown on 17th of January, 1923.
http://www.scientistsandfriends.com/helicopters.html
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Helicopters - 1930/1945
History of Helicopters from the beginning until now.
http://www.helis.com/pioneers/1930.php
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History of the Helicopter and Igor Sikorsky
Chronicle of the evolution of rotary wing aircraft - helicopter pioneers and inventors profiled.
http://inventors.about.com/od/hstartinventions/a/helicopter.htm
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The History of Helicopters
It has often been said regarding new inventions and advances in technical fields that there is very little that is actually new. What is meant by that, of course, is that somewhere, sometime, along civilization's march of progress, an idea considered a modern day original had already been thought of.
http://www.aviastar.org/history/
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The World's First Helicopter
On September 14, 1939, the VS-300, the world's first practical helicopter, took flight at Stratford, Connecticut. Designed by Igor Sikorsky and built by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation, the helicopter was this first to incorporate a single main rotor and tail rotor design.
http://connecticuthistory.org/worlds-first-helicopter-today-in-history/
