11/30/2006. The VZ-2A research aircraft was built under a joint US Army-US Navy contract to investigate the tilt-wing concept. First flights were made: August 13, 1957 (vertical), January 7, 1958 (horizontal) and July 15, 1958 (transition and vica versa).
In November 1960 NASA began an engineering evaluation. In May 1961
Boeing Vertol (Vertol was purchased by Boeing in 1960) received a
contract to improve stability and control, thereafter test flying
was resumed. The programme ended in 1965 after a total of more
than 450 flights. View also photo