The LLTV, or "flying bedstead' was an aircraft designed to simulate the experience of landing on the moon, riding a rocket down in 1/6th G. It was effectively a free flying simulator which used the fly by wire system to make the vehicle move as if it were in lunar gravity, while flying in Earth's gravity.
It's the first example of fly by wire controls, it almost killed Neil Armstrong and, some mad-lad built a copy of it for X-Plane:

https://forums.x-plane.org/index.php?...

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