tahadar wrote:like I said, this is not entirely true. Mclaren featured large cut-outs ahead of their rear wheels in pre-season testing to promote more airflow into the diffuser by entering under the sides of the floor. Some teams also feature floor 'curls' for the same reason.
They screwed up their diffuser.
Where are the holes now?
The floor curls you speak of (the small kinda "gurney flaps" upstream the rear tyre) are more about the stagnation point infront of the rear wheel than the floor.
The vortex sheets generated by most of the appendages on an F1 car cannot be compared to that from a LERX on say, an F-16 or MiG-29. The vortices here are much weaker and prone to vortex burst much earlier.
Again - you want to seal off the sides
of the floor. They do strive to try and achieve that.