chuckdanny wrote:I discovered a knew vortex that passes through the inside of the rear wing endplate
Though I agree with the earlier assessment that this is a vortex shed from the near end plate, this is a great shot nonetheless.
The lack of end plate slots on the Red Bull means the vortex is shed straight back and not off to the side like would be the case otherwise.
via Scarbs
Every object moving through a fluid carries a theoretical "Trefftz Plane" behind it. Think of it as the wall of air the car just punched through, and minimizing the size of the "hole" left in that wall means reducing far field drag.
So, because the vortex from the Red Bull is largely "covered" by the rear wing, that means it results in reduced far field drag in comparison to any solution where vortices are shed off to the side. Now, that doesn't mean this solution has less overall drag. I still think Red Bull's slot-less design results in higher induced drag. But, it's an interesting aside.