Floor & Diffuser

Since 2022, the floor is the most important aerodynamic surface on an F1 car. Wings are for trimming and balancing; the floor is where the car actually grips the road.

The Venturi Principle

Two sculpted tunnels run the length of the floor, converging inward from the side edges to a throat, then expanding toward the diffuser. Bernoulli's principle applies: air accelerating through the narrowing section drops in pressure. Low pressure beneath the car = suction = downforce. No moving parts. No complex mechanisms. Just geometry.

The Diffuser

At the rear, the tunnels feed into an expanding diffuser — a ramp that accelerates the underbody airflow as it exits. This creates a low-pressure "anchor" that pulls air through the tunnels from front to rear, amplifying the suction effect throughout. The taller the diffuser exit, the more air it can process.

Ride Height Sensitivity

Ground effect is brutally sensitive to ride height. Lower the car = more downforce, but also increasing risk of "stall" — where the underbody flow completely separates, causing sudden catastrophic downforce loss. Teams walk a 2-3mm tightrope, using progressively stiffer springs and active suspension systems to maintain consistent ride height under varying fuel loads and G-forces.

The Wake Advantage

Unlike wing-generated downforce, venturi tunnels don't significantly disrupt the air behind the car. The 2022 switch means a following car loses only 4-18% of its downforce (compared to 35-50% before) — making wheel-to-wheel racing genuinely more feasible.