On Fri, 17 Oct 2003 18:09:44 -0500, Alan Minyard
wrote:

NASA even built a "zero-G" test rig to try out the landers controls.
It had a lift engine that could be throttled to exactly balance out
the weight of the rig, so the thrusted operated at "zero-G"

Nope. The LLRV/LLTVs balanced out 5/6ths of the weight, so they were
operating at lunar gravity, not zero g. They could simulate the LM's
engines, too, so the landings could be simulated, and there were, no
doubt, times when the normal acceleration was zero g, not 1/6th g.

Mary

--
Mary Shafer Retired aerospace research engineer