The return of ground-effect has made floor designs a key battleground in F1. Here's how teams are trying to derive more and more performance from the floor and the underside of the car:
Whereas once the key to aerodynamic performance lay in wings and other aero surfaces, now more downforce as an overall percentage can be found through exploiting the underside of the car to maximum effect.
Previously the regulations required a flat surface on the step plane, with the diffuser section at the rear offering the ability to add vertical volume. It's not all about creating the maximum volume either, but rather more about controlling the flow through the 'tunnel' that's been created and the pressure distribution that inevitably creates en route.
Note the sculpted finish to the transition region [1 & 2] which works alongside the floor fences, whilst a stepped boat tail section [3] gradually alters the volume from the curved tunnel portion to the diffuser section.
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