Dating tunnel info
His whirling arm was 5 feet long and attained tip speeds between 10 and 20 feet per second.Armed with test data from the arm, Cayley built a small glider that is believed to have been the first successful heavier-than-air vehicle in history.The manifestly complex relationship between drag, model shape, model orientation, and air velocity defied the simple theory propounded earlier by Newton and made ground testing of aircraft all the more important to the infant science of flight.
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Although Cayley performed many aerodynamic experiments and designed precocious airplane models, his major contribution to flight was one of design philosophy.
Before Cayley, would-be aeronauts believed that the propulsion system should generate both lift and forward motion at the same time, as birds and helicopters do.
Both approaches were employed in the early days of aeronautics.
First, relatively steady natural wind sources were searched out.
Robins mounted various blunt shapes-pyramids, oblong plates, etc.