Thank you for your explanations.godlameroso wrote: ↑29 Jul 2019, 19:07It makes perfect sense if you're trying to aim a vortex in between the engine cover and rear wheel, particularly if you're using the undercut of the engine cover to do so.
The air under the car will always be faster than the air above it because the air below is squeezed into a smaller volume due to the road and floor being so close to each other.
If you look closely these cars already have the ground effect tunnels that they plan for 2021, they use the bargeboards to form vortecies to create the outer wall of the "tunnel" since the floor is flat, the vortecies keep the air from spilling out from under the floor. Ironically you have to spill some air from the side of the floor to create the vortecies which fence in the airflow going underneath the car. If you spill too much air trying to seal the floor you don't get enough flow in the actual floor itself. Conversely if you don't spill enough air to create a consistent vortex along the floor, it spills out of the floor under yaw and you get horrible downforce instabilities.
So one needs to find a right compromise of floor sealing vortecies created by the bargeboards, while allowing and directing enough mass air flow to keep the diffuser sucking.
The RB15 has been fine tuning this compromise since the season started and have started making serious gains because of this. I'm just glad the chassis has enough flexibility to allow development.
I still think those wastegate pipes have something to do with it, because the car's performance has increased with the timing of those pipe modifications.
This is the reason why F1 sometimes drive me crazy...hell, they are doing "just" minor changes, but every weekend.
A little bit of FW-endplate update here, some extension of nose turning vanes there and so on.
RBR as we are familiar with, constant development instead of big updates during the season.