Originally Posted by
Old Aero Guy
Vref for the 773ER is about 150 kt. It has the wing area disadvantage of being a stretch airplane.
At 251t Flap 20 or 25, its 160 plus, the 300 is more like 150 kt, its 13 t lighter on landing.
As a result of flight testing the A380-800 has come in under its predicted Vref, how do you know what a A380-900 will do ?