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Development of Helicopter Concepts


Click picture to select page


Date Picture Page..
1783 Click to view page
Counter rotating feathers
1786 Click to view page
Scientific paper on rotating wings
1809 Click to view page
Foundations of modern aerodynamics
1843 Click to view page
Paper: Aerial Carriage
1860 Click to view page
Steam models called Helicopteres
1874 Click to view page
Sideward thrusting tail rotor