Originally Posted by
Pittsextra
Not sure if I'm reading that correctly but you are saying that a rapid lowing of the collective in the cruise whilst holding the cyclic stick stable generates a sustained zero/negative G? (reading below zero G as negative).
Yes, with caveats. It varies by type due to the exact head geometry. It varies a lot according to speed, so at 100 kts not much effect, at 150 kts yes g will go negative. "Sustained"? - well not indefinitely, of course, but probably for long enough to allow Nr to decay to unrecoverable. Eventually g will settle at 1 when the heli reaches terminal velocity with the rotors stopped (height permitting)