Understanding
SAS, I believe that you used a few different words but came up with the same underlying thought.
Joining SA in 1966, the pilot who did the structural demonstration on the S-55, Jim Chudars, was still there, and relayed that one of those maneuvers resulted in a stall that flipped him left and fully inverted*.Thankfully, the modern rotors are a bit more forgiving.
*All of the load factor maneuvers are specified to be done at maximum weight and most adverse CG, not a good place to be upside down in a UH-19!
Thanks,
John Dixson