Originally Posted by CONF iture
Quite different as Vs1g is the stall speed at 1g.
So how would you demonstrate it in normal law in a certification flight test?
P.S.
The diagram you posted is a schematic illustration that alpha-max is just shy of alpha-CLmax. Alpha-CLmax would define Vs1g for a conventional airplane, but not for a FBW airplane with a flight control system that is designed to prevent achieving and exceeding alpha-CLmax. The difference between alphamax and alpha-CLmax (the safety margin) is the performance penalty that must be paid for having a 'hard' stall protection, and Airbus has never made a secret of that fact.
Conventional aircraft having a stickpusher pay a similar price in performance if the pusher is set to fire before alpha-CLmax.