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| Keywords: HE2G8.jpg In 1907 the French inventor Paul Cornu made a helicopter that used two 20-foot 6-meter counter-rotating rotors driven by a 24-hp 18-kW Antoinette engine It lifted its inventor to about five feet 1 5 meters and remained aloft one minute http //www centennialofflight gov/essay/Rotary/early_20th_century/HE2G8 htm <br />Transferred from http //en wikipedia org en wikipedia ca 1907 author PD-USGOV PD-USGov original upload log page en wikipedia HE2G8 jpg 2007-01-04 21 14 Signaleer 504×157× 27573 bytes <nowiki>In 1907 the French inventor Paul Cornu made a helicopter that used two 20-foot 6-meter counter-rotating rotors driven by a 24-hp 18-kW Antoinette engine It lifted its inventor to about five feet 1 5 meters and remained aloft one minute Source </nowiki> Black and white photographs of France Paul Cornu helicopters Tandem-rotor helicopters Antoinette 8V | ||||
