Blackout wrote:So, to sum up;
FI did this according to piola
The rules demand the A-A bulkhead is at 525mm, but allow the rest of the raised chassis to be as high as 625mm. The step from A-A to raised chassis is not specified in the rules (for this year).
So to gain the space for aero under the raised chassis, teams will step up the chassis behind the A-A bulkhead. This is what Force India have done
There's no CofG reason to the lower A-A bulkhead, its simply to meet the rules. The wishbone mounts, inboard suspension and pedals can largely stay in the same place as last year.
Teams should be able to deal with the aerodynamic inconvenience of the step, a "S" duct would help, but seeing as Ferrari didn't race theirs slotted nose last, I doubt its value.
If you do run an "S" duct, then you'd want the inlet below it, this effectively cuts off the air passing under the nose and the remaining flow can easily reattached to the underside of the chassis, the result will be as the step isnt there and you have a chassis as rasised as last years. The top exit then helps reattach the flow over the step above the nose, which will be further aided by a vanity panel.