Vanja #66 wrote: ↑28 Mar 2018, 14:16
I don't think you'd want your diffuser to stall. It would mess up entire flow under the car, including barge boards and front wing, leading to instability in braking.
I fail to see how it could happen in a predictable manner. When going at high speeds, there is a tendency for the rear to squat, lowering the AoA of the floor and therefore making it even more difficult to stall. Also as you said, it would create massive instability when braking.
Sometimes it seems to me that after the F-Duct, people started thinking that all aerodynamic devices can be predictably stalled to increase top speeds. I remember when Ferrari had their flexing rear wing and there was a lot of people saying that it was an attempt to make the RW stall, when in fact the reduced AoA it created actually made it more difficult for it to stall than normal.