[nickcano]

That's interesting, I wonder what happens if you take one of the current prototypes and hover off the ledge of a canyon... Will you drop suddenly and go splat, or will you keep altitude? Intuition says the former, but I'd like to know objectively.

[losteric]

If you're flying high enough before going over the cliff, you'd keep hovering... it's no different than a helicopter. These jets can definitely fly that high.

That said, if you're not flying high enough... if it's just the jet pushing air against the ground... you will go splat.