homemade helicopter
grabcad
On February 23, 2013, my friends and I observed an impressive homemade helicopter showcased in a YouTube video by Max Bracic (http://www.youtube.com/watch?v=hIJkuGfxK_8). He also shared another perspective of the same helicopter (http://www.youtube.com/watch?v=4x6pwHKuNQA) on his channel. Afterward, we watched an interview with the creator, where he discussed the technical specifications of his remarkable invention. The homemade helicopter had a weight of 114 kg and a take-off weight of 200 kg. It was powered by a snowmobile "Buran" engine, producing 28 hp. The gear ratio between the engine and rotor was 10:1. The impressive rotor diameter was 6 meters, allowing it to reach speeds of up to 80 km/h. The helicopter could lift to a height of 10 meters. Additional information in Russian is available at this link (http://publ.lib.ru/ARCHIVES/M/''Modelist-konstruktor''/_''Modelist-konstruktor''_1997_.html), where you can access the file (mk1997_11.djvu) using WinDjView for further exploration.
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