The Rise and Fall of the Hiller X-18

In the late 1950s, the pioneering X-18 "Propelloplane" marked an ambitious foray into tiltwing and V/STOL technology for the U.S. Air Force. Built from assorted aircraft parts, including contra-rotating propellers and powerful turboprop and turbojet engines, the X-18 embarked on 20 test flights that uncovered significant challenges, such as sensitivity to wind gusts and

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