X-18

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By NASA - https://www.nasa.gov/sites/default/files/thumbnails/image/lrc_20180319_lbfdpromo_ne1207_0.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=68018117

Presenting the Three Greatest X-Planes Ever Built

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By en-wiki, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1032075

Meet the World’s First Tiltwing Design Airplane

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Stories From X-18

Hiller X-18

Hiller X-18 Can Only Be Described in 2 Words

By en-wiki, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1032075

The Experimental Cold War Aircraft That Inspired America’s V-22 Osprey Tiltrotor

These Prototype Planes Push the Boundaries of What's Possible

This Experimental Aircraft Helped Inspire the V-22 Osprey Tiltrotor

X Planes: How These 3 Insane Planes Flew Into the History Books

Experimental Fighters: The 3 Greatest X-Planes Ever Built

Wikimedia Commons

X-Planes Secrets: The Three Experimental Fighters That Changed Aviation

By NASA - https://www.nasa.gov/sites/default/files/thumbnails/image/lrc_20180319_lbfdpromo_ne1207_0.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=68018117

Presenting the Three Greatest X-Planes Ever Built

By en-wiki, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1032075

Meet the World’s First Tiltwing Design Airplane