Uploaded July 2022 | Updated September 2026, 3 weeks ago

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The Hiller X-18, nicknamed Propelloplane, was an experimental cargo transport aircraft that served as a testbed for tiltwing and V/STOL (vertical/short takeoff and landing) technology.

SOURCE:
Wikipedia, en.wikipedia.org/wiki/Hiller_X-18, License: CC BY-SA 3.0 (creativecommons.org/licenses/by-sa/3.0/) - the text has been remixed and shortened

MEDIA:
Images in the Public Domain.

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