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Igor Sikorsky is generally credited for spearheading the development of helicopters, but the man who envisioned the first vertical-flight machine was Leonardo da Vinci, more than five centuries before a helicopter was set in motion. Gennai Yanagiasawa however, a 75 year old Japanese helicopter developer, is credited for constructing the world's smallest helicopter, a machine weighing only 75 kilograms, without a tail and with counter rotating blades to ensure stability. He plans to take ... Read »