The First Certified Human Powered hover. 

The Leonardo da Vinci series of helicopters were built at CALPOLY San Luis Obispo starting in 1981 and ending in 1989. They were all 2 bladed, tip driven machines. 

Leonardo I was a 50 foot radius rotor with a 30 foot per second tip speed and large cord airfoils. 

Leonardo II had a radius of 50 and 70 feet and was designed for a 50 foot per minute tip speed. 

Leonardo III was a 50 foot radius machine with a 50 foot per minute tip speed. It was much refined and flew for record in Dec. of 1989.

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