Download or read book Vertical Challenge written by Jay Spenser and published by . This book was released on 2003-04-17 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.