[Yosemitest]

That aircraft for sale on e-bay is real, and was part of the research and experimentation of the military, in its day.
From the listing, it never got out of ground effect.
I guess you've heard of the V-173 "Zimmer Skimmer"?

[Chainmail]

Ah yes - from what I read about it, it could almost takeoff and land vertically. The Grumann XF5U was the attempt to turn that design into a shipboard fighter. It was overcome by prop and transmission headaches and then by the emergence of jet engines and the Japanese surrender. Really wish they had flown it just once but they only taxiid it around and then scrapped ir. Dang shame they didn’t at least preserve it.