Vertical Challenge: The Hiller Aircraft Story Chronicles the most innovative and least remembered of the helicopter industry's pioneering companies. Founded by Stanley Hiller, Jr., Hiller Aircraft produced conventional and ramjet helicopters, flying platforms, and other fascination flying machines.
![Vertical Challenge: The Hiller Aircraft Story [Paperback]](/itemImage/2/6/1/7/2_341181.jpg "Vertical Challenge: The Hiller Aircraft Story [Paperback]")