I’ve put scans of a 1968 Popular Science article on the Lockheed AH-56 Cheyenne attack helicopter and a Boeing-Bell brochure on the JVX tiltrotor (which became the V-22) on the APR Patreon dropbox, in the 2016-02 folder.
The Pop Sci article featured cover art by Robert McCall. Just cuz, I tinkered with the cover art, attempting to scrape off the text and restore it to just the painting. Perhaps not a 100% success, but not too bad. The JVX is not *quite* the final V-22 design; a notable difference is the inclusion of a .50 caliber gatling gun in the nose and a rocket launcher hanging off the side the cockpit.
If interested in getting these, please consider signing up for the APR Patreon. The “Extras” are available to all $4 patrons. Quite a pile of high-rez stuff is available now.
Actually, the rocket hanging off the nose isn’t that far from what has been trialed on the MV-22B, specifically the one bailed to Bell-Boeing as the ATTR (Advanced Technology Tilt-Rotor). They did operational testing with it in Yuma.
Production versions, if they went that way, would have them on both sides instead of just one, which was convenient for proof of concept.