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In summary, the requirements to win the Sikorsky prize include a flight duration of 60 seconds and reaching an altitude of 3 meters (9.8 ft). Many have attempted to fly human powered helicopters both before and after the creation of the Sikorsky Prize. None have met all of the prize's requirements. Very few aircraft in the history of aviation have succeeded in leaving the ground under official witnessing. The first one was the ''Da Vinci III'' in 1989 , designed and built by students at Cal Poly San Luis Obispo in California, USA. It flew for 7.1 seconds and reached a height of 8 inches (20 cm). The second was the ''Yuri I'' in 1994 , designed and built by students at Nihon University in Japan. It flew for 19.46 seconds and reached an altitude of 20 cm. SEE ALSO External links
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