Originally Posted by
212man
It's also referred to as 'servo transparency'.
I may be wrong, but I thought one reason for the demonstration was that the French Army had lost at least one aircraft during NOE flight in the early days of service.
All I can say is that you had to be a lot more careless to get a Gazelle to stall its jacks than to find retreating blade stall in a Whirlwind - having seen the latter at about 110 kts and about 150 feet, the outcome at low level was potentially just as exciting and dangerous - I'm thankful that the Whirlwind I was in rolled upright from the steep turn, rather than inverted.