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> solving for stability for a variable size and weight human that’s wriggling around.

Was solved for Segways. Just need the third axis and some kind of special emergency landing solution (goo + inflato-ball??).

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No, it’s more complex than that. A Segway is counting on the fact that it’s sitting on the ground. The force vector on the rider is purely a function of angle. A jet pack has the issue that there is a moveable center of gravity and moveable sources of thrust that feed back into each other. It’s doable, I’m sure, but it’s also much more complicated than a Segway + another direction.

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