The original footage of flight testing and flight demonstration for the Nolan brothers, Jack and Herb Nolan, and their pendulum style twin engine coaxial helicopter design. The little helicopter was to be marketed by Eagles Perch as the 51 HJ. It was later sold on to Pheonix Rotor Craft and marketed as the Phoenix Skyblazer though little has come of it to date. See more on this and other homebuilt helicopters here: http://www.redbackaviation.com/catego...