Rotor helikopter: Perbedaan antara revisi
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* [http://www.b-domke.de/AviationImages/Rotorhead.html Helicopter Rotorhead Close-up Image Gallery]
* [http://www.google.com/patents?id=PYReAAAAEBAJ&pg=PA1&source=gbs_selected_pages&cad=2#v=onepage&q=&f=false "Helicopter Aircraft"]. US Patent 2,368,698, for flybar invention, by Arthur Young
* [http://www.michaelyon-online.com/the-kopp-etchells-effect.htm "The Kopp-Etchells Effect"] {{Webarchive|url=https://web.archive.org/web/20090820040127/http://www.michaelyon-online.com/the-kopp-etchells-effect.htm |date=2009-08-20 }}. Dispatch by Michael Yon, war correspondent
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