F1 Glossary · cars
Venturi Tunnels
Venturi tunnels are shaped channels under an F1 car that use airflow to create powerful suction, pulling the car toward the track.
Venturi tunnels are long, sculpted channels running along the underside of a modern Formula 1 car. By narrowing the space through which air flows beneath the chassis, these tunnels force the air to accelerate. According to Bernoulli’s principle, as the air speeds up, its pressure drops, creating a vacuum-like effect that sucks the car toward the asphalt. This phenomenon is known as "ground effect" aerodynamics.
Why They Matter in a Race
These tunnels are the primary source of downforce for the current generation of cars introduced in 2022. Unlike traditional front and rear wings, which create significant "dirty air" (turbulent wake) for the car behind, Venturi tunnels produce "cleaner" downforce. This allows drivers to follow each other more closely through high-speed corners without losing as much grip, theoretically leading to more frequent overtaking opportunities and tighter racing across the grid.
Recent Examples and Challenges
The reintroduction of Venturi tunnels in 2022 fundamentally shifted the competitive order. The Red Bull Racing RB18 and RB19 are the most successful examples of this technology; their floor designs managed the pressure distribution so effectively that they maintained high downforce across a wide range of ride heights and speeds.
Conversely, many teams initially struggled with "porpoising." This occurs when the suction from the tunnels becomes so strong that the car is pulled too close to the ground, causing the airflow to stall. The car suddenly loses downforce, rises up, and then the cycle repeats, causing a violent bouncing motion. This was a defining technical hurdle for teams like Mercedes-AMG during the 2022 season.
Common Viewer Confusion
Fans often confuse Venturi tunnels with a simple flat floor. While older F1 cars used flat floors with a rear diffuser to generate some suction, modern Venturi tunnels are highly complex, three-dimensional arched structures. They start near the front wheels and expand toward the rear. Additionally, while they generate downforce, they are not "active" parts; they rely entirely on the car's movement and proximity to the track surface to function.
Common questions
- What is the Venturi effect?
- It is a fluid dynamics principle where fluid or air pressure decreases when it flows through a constricted section of a channel. In F1, the space between the car's floor and the track acts as that constriction.
- Why were these tunnels reintroduced in 2022?
- The FIA reintroduced them to reduce the turbulent wake produced by over-body wings. By generating downforce underneath the car, the air left behind is less disrupted, allowing cars to race closer together.
- Do Venturi tunnels work at low speeds?
- They are significantly less effective at low speeds because the suction depends on the velocity of the air moving under the car. Their impact becomes exponentially more powerful as the car's speed increases.