Pursuing the same “Holy Grail” the V-22 Osprey is beginning to fulfil nowadays, the always innovative Hughes company played in the 1960-70’s with the elegant, yet complicated, rotor/wing concept. In it, essentially, you used your rotor for vertical/slow flight and stop it to form a sort of wing for forward flight. Cool, isn’t it?. They were not alone.
Superb artwork of the Hughes’ Rotor Wing brochure. Sadly, just a paper dream.