P1racenews AI automatic summary:
Is it a cutout, is it a hole? Gary Anderson explains one F1 2026 trend that a number of teams have picked up on
The new 2026 Formula 1 cars feature the return of the “mousehole”, now enlarged and possibly called “the rathole” for increased performance potential, notably seen on the McLaren under the old ground effect regulations.
The slot in the rear floor directs airflow into the diffuser expansion area, similar to past mousehole designs, as showcased on the Mercedes with the aim of enhancing underfloor performance.
Despite the significant opening, its placement after the diffuser expansion start acts to control airflow spillage from the tyre corner, redirecting it for improved underfloor efficiency.
To further optimize airflow in this area, internal splitters and louvres on the floor’s top surface work in tandem to enhance outwash, minimize inwash, and improve underfloor sealing.
Mercedes has even integrated a small wing section above the floor to boost outward airflow, strategically positioned behind the diffuser ramp start to mitigate airflow separation risks.
