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Hiller nicknamed their X-18 the Propelloplane for public relations purposes.
Preliminary testing occurred at Moffett Field Naval Air Station, CA.
The first flight (hop) was on 11/20/1959 followed by the first real flight on 11/24/1959 with Hiller test pilots George Bright and Bruce Jones.
Further test flights were held at Edwards AFB, ultimately recording 20 flights.
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A number of problems plagued the X-18 including being susceptible to wind gusts when the wing rotated, acting like a sail.