Originally Posted by
Ascend Charlie
It wasn't a success because of the limitations of the human arm - raising the "collective" induced movement in other axes, and it was hard to get a pure movement in one axis without disturbing the others. Of course with the natural secondary effects of controls, moving one requires corrections in the others, but the induced movements weren't necessarily in the right direction.
Only half of a FBW solution - rather than just directly controlling the flight surfaces it should have been directing a stabilised flight controller. In other words, an up command needed to also know about increasing anti torque, compensating side drift etc.