RED BULL EXPERIMENTAL FLOOR
Red Bull followed Ferrari’s lead and added some small vertical turning vanes on the top outer surface of its underfloor. Like Ferrari, it was tested only on Friday by way of an experiment.
These vanes are a little confusing. You want the airflow on the top surface of the floor to be pulled out through the longitudinal and angled slots on the outer edge of the floor, and then you also try to turn that flow over the top surface with these small turning vanes. Yes, they can help prepare the flow direction, but they also block off some of the slots and will reduce the amount of flow that goes through the slots.
I’m sure they will reappear, as both Ferrari and Red Bull get on top of what they want to get from them. But it could also be just initial testing for 2019, when the bargeboard trailing-edge vortices will have much less effect on how the outer floor sealing is achieved.