Ground effect in F1 is an aerodynamic concept that essentially “sucks” a Formula 1 car to the track by using the shape of its underside. In simple terms, ground effect F1 explained means the car’s underfloor is designed to create a low-pressure area underneath, pressing the car downwards.
This phenomenon lets Formula 1 ground effect cars generate immense downforce (vertical force pushing the car to the road) with minimal drag, dramatically improving cornering speeds. In this article, we’ll explain how ground effect works, explore its history in F1, and discuss how recent rules (2022–2025) have reintroduced ground-effect aerodynamics to improve racing.
How Does Ground Effect Work in F1?
Ground effect works by turning a race car’s floor into an upside-down wing (or tunnel) that accelerates airflow underneath the car. As the air flows through the narrow gap under the car, it speeds up and its pressure drops (a result of the Venturi effect, related to Bernoulli’s principle).
With low pressure beneath the car and higher pressure above, the higher-pressure air on top pushes the car downward. In other words, the car is sucked towards the track, generating a tremendous amount of downforce. This downforce increases tire grip and allows the car to corner much faster.
In a traditional setup, F1 cars relied heavily on wings and over-body aerodynamic elements to produce downforce. Ground effect, by contrast, generates most of the downforce under the car. Modern F1 cars feature specially shaped venturi tunnels in their underbody – these tunnels start with a narrow inlet and expand toward the rear, accelerating the airflow and creating that all-important low-pressure zone.
The result is a powerful suction effect holding the car to the asphalt. One big advantage is that this method produces less turbulent air (“dirty air”) behind the car compared to large wings, meaning a following car can maintain more downforce when chasing (which improves overtaking opportunities).
More from the Singapore GP
Catch up with Total Motorsport's latest Singapore GP coverage, including Max Verstappen's victory at Marina Bay, Ferrari's costly strategy gamble, the full race classification, and the updated 2026 Formula 1 Drivers' and Constructors' Championship standings.
However, ground effect aerodynamics also come with challenges. The amount of downforce it produces is highly sensitive to ride height (the distance between the car’s floor and the track). If the car bottoms out (gets too close to the ground), the airflow can stall, suddenly causing a loss of downforce.
On the other hand, if the car is run too high, the ground effect is weakened. This sensitivity means engineers must keep the car’s ride height and suspension very tightly controlled to maximize the effect. Early ground effect cars were famously set up with extremely stiff suspensions to prevent the aerodynamic platform from moving. This yields great performance, but a very stiff car can be uncomfortable and tricky to drive over bumps.
Ground Effect in Formula 1 History
Ground effect isn’t new to Formula 1 – it first appeared in the late 1970s and revolutionised F1 car design. The pioneer was Colin Chapman of Team Lotus. Chapman’s Lotus 78 “wing car” debuted in 1977, featuring side pods shaped like inverted wings to create low pressure under the car. It wasn’t until 1978, with the Lotus 79, that ground effect showed its full potential.
Mario Andretti drove the Lotus 79 to the 1978 World Championship, as the car dominated thanks to its unparalleled cornering ability. The Lotus ground effect cars used sliding side skirts along the bottom edges of the sidepods to seal the gap between the car floor and the track. By sealing in the low-pressure area under the car, these skirts prevented high-pressure air from leaking underneath, maximizing the suction effect.
With Lotus’s success, every F1 team quickly jumped on the ground effect bandwagon. By 1979–1980, virtually all Formula 1 cars were “ground effect cars,” featuring sculpted underfloors and side skirts. This sparked an aerodynamic arms race in the sport – teams experimented with wider sidepod tunnels and even moved components around to enhance ground effect.
For instance, designers shifted cockpits and driver seating positions forward to make more room for larger venturi tunnels in the sidepods. Downforce levels skyrocketed as engineers learned to exploit ground effect, and lap times tumbled.
However, these gains came with serious safety concerns. Ground effect cars needed very stiff suspension and minimal ground clearance, which made the ride extremely harsh and could cause the car to porpoise (bounce up and down) if the airflow under the floor was disrupted. If a car hit a bump or a side skirt malfunctioned, it could suddenly lose most of its downforce – a frightening scenario for a driver at high speed.
Several scary incidents occurred when ground effect cars lost grip unexpectedly. Additionally, teams were pushing the limits of design in dangerous ways (for example, some cars in the early 1980s had the driver’s legs positioned far forward in the chassis to accommodate bigger tunnels, reducing crash protection).
By the early 1980s, the governing body (FIA) decided to intervene for safety. First, movable or sliding skirts were banned for 1981, making it harder to perfectly seal the floor. Then, for 1983, ground effect was effectively outlawed – new rules mandated flat floors with no underbody tunnels, and a minimum ride height was imposed.
This ended F1’s first ground effect era. Cars from 1983 onward had to rely on wings and conventional aerodynamics again, as the sport prioritized safety over the extreme cornering performance of ground effect. Downforce levels dropped and teams refocused on over-car aero devices for the coming decades.
An interesting footnote from the first ground effect era: other creative concepts emerged, like Gordon Murray’s Brabham BT46B “fan car” in 1978. This Brabham used a rear-mounted fan to suck air from under the car, artificially creating ground effect suction. It won the only race it entered, but was promptly banned as well.
Return of Ground Effect: 2022 Rule Changes
After nearly 40 years, ground effect made a comeback in Formula 1 with the major aerodynamic rule changes of 2022. Leading up to 2022, F1 cars had a problem: they produced so much turbulent air (dirty air) with their wings and bargeboards that cars struggled to follow each other closely, hurting overtaking.
The new 2022 regulations were designed to combat this by shifting the emphasis towards underbody aerodynamics (ground effect) and simplifying many overbody aero parts. By having cars generate more downforce with their floors and less with complex winglets, the hope was that the wake turbulence would be reduced, allowing for closer racing.
The 2022 cars featured bold new venturi tunnel floors – essentially long channels sculpted under the car to create the Venturi effect we described earlier. Unlike the 1970s cars, modern F1 does not allow movable side skirts, so teams instead use careful aerodynamic design to seal the floor.
For example, the floor edges and diffuser shape are tuned to create vortex currents that act like an “air skirt,” helping keep low-pressure air trapped under the car. The front wing and nose were also reshaped in 2022 to send airflow smoothly into the tunnels. In essence, Formula 1 returned to true ground effect cars in 2022, but with a more controlled, high-tech approach suitable for modern safety standards.
Despite extensive simulation and testing, teams and drivers encountered an old nemesis at the start of 2022: porpoising. Porpoising is the violent bouncing of the car at high speeds due to the ground effect loading and unloading. Here’s what happens: as the car accelerates, the ground effect sucks it toward the track, increasing downforce – until the car gets so low that the airflow stalls and downforce suddenly drops, causing the car to bounce upward.
Then the airflow reattaches, sucking the car down again, and this cycle repeats rapidly. The result is a car bobbing up and down like a porpoise in water. Many teams struggled with this phenomenon in the early races. Notably, Mercedes suffered severe porpoising in 2022; their drivers (George Russell and Lewis Hamilton) complained of extreme discomfort. Hamilton even experienced back pain after one race (Baku 2022) due to the continuous pounding of the car bottoming out, and Russell warned that the oscillations could be a safety issue.
Teams scrambled to reduce porpoising by adjusting setups, strengthening the floor, and even adding reinforcement stays to the floor edges. Mid-season, the FIA stepped in with a technical directive to set a limit on allowed vertical oscillations and to prevent teams from running excessively flexible floors. By the end of 2022, most teams had tamed the bouncing to a manageable level through a combination of minor car updates and compromises in setup.
For 2023, the FIA introduced tweaks to the rules to further combat porpoising and improve safety. The floor edges were raised by 15 mm, and the diffuser throat (the height of the venturi tunnel exit) was also raised slightly. These changes made it harder to seal the floor as tightly, which reduced the maximum ground effect downforce but ensured the cars wouldn’t run so close to the ground that they bounce uncontrollably. The result in 2023 was a notable reduction in porpoising across the grid. The racing improved as well – drivers could follow a bit closer than in the past, fulfilling part of the 2022 rules’ promise.
In 2025, Formula 1 continues to refine the ground effect formula. The 2025 aerodynamic rules build upon the 2022 overhaul with further adjustments aimed at balancing performance and close racing. For example, minor revisions to floor design and diffuser geometry are being implemented to enhance stability in high-speed corners, and front wing tweaks are planned to reduce the outwash (turbulent air) generated.
By this point, all F1 teams have a much better grasp on ground effect aerodynamics, and every car on the grid is designed around underfloor tunnels as the primary source of downforce. Ground effect is now firmly entrenched as a cornerstone of aerodynamics in Formula 1 once again. Engineers are continually innovating to find the optimal way to use the car’s floor for performance, while the FIA monitors and adjusts the rules to keep the playing field fair and the cars safe.
Looking ahead, the next major rule change is expected in 2026, when the FIA plans to dial back some ground effect influence by requiring partially flat floors and allowing more active aerodynamics on the wings. This is somewhat reminiscent of the early ’80s ban – illustrating how F1 technology often comes full circle. But until then, ground effect remains central to F1 car design.
Ground Effect vs Traditional Downforce
“Downforce” simply refers to the vertical force pressing a car into the ground, and it can be generated by various aerodynamic features. Ground effect is one method of creating downforce, whereas the other common method is using wings and spoilers (aerofoils) on the car’s body. What’s the difference between ground effect downforce and wing-generated downforce? The biggest difference is efficiency and side-effects:
- Efficiency (Lift-to-Drag Ratio): Ground effect produces a lot of downforce for relatively little drag. Because it uses the car’s underside (which is largely hidden from the airstream), it doesn’t “cost” as much in terms of air resistance. In contrast, a big rear wing or front wing can also create huge downforce, but these act directly in the airflow and add significant drag (slowing the car on straights). Ground effect is often termed “free downforce” because it’s aerodynamically efficient – it lets the car corner faster without as large a hit to straight-line speed.
- Dirty Air (Turbulence): Downforce from wings tends to create strong vortices and turbulent wake behind the car (think of the wake of an airplane). This dirty air makes life difficult for a car following closely – the chasing car loses downforce as it enters the turbulent flow, causing understeer and overheating tires. Ground effect, on the other hand, pushes air out at the rear in a more controlled manner (much of the air is directed upwards through the diffuser in a vertical plume). The turbulence generated is less disruptive to a car behind. That’s why F1’s return to ground effect in 2022 was aimed at reducing the downforce loss for trailing cars, thereby improving overtaking.
- Ride Height Sensitivity: As mentioned, ground effect downforce is very sensitive to ride height. A small change in gap under the car can cause a large change in downforce (even a sudden stall if too low). Wing downforce is comparatively more stable with respect to ride height – a wing will keep working as long as air flows over it, until you’re at extreme angles. This means ground effect cars require stiffer suspension or active systems to maintain an optimal ride height, whereas cars focusing on wings can allow a bit more suspension movement without losing all downforce. In the 2022–2023 cars, we saw teams struggle to find this balance: if they ran the car very low for maximum ground effect, they risked bottoming out and bouncing; if they raised it for comfort, they lost performance. Engineers continue to fine-tune things like suspension stiffness and use of skid blocks to protect the floor while extracting maximum downforce.
- Overall Downforce Package: Modern F1 cars actually use both ground effect and wings. The ground effect floor is now the biggest contributor to downforce, but the front and rear wings, plus other aero devices (like the beam wing and diffusers), still add significant downforce. The key is that, by making the floor do more of the work, designers can simplify wings (reducing elements, adding curved endplates, etc.) to cut down turbulent air. The combination of a ground effect floor with efficient wings gives the best of both worlds: plenty of total downforce and a cleaner wake. In fact, teams like Red Bull have excelled in this area – under the guidance of aero guru Adrian Newey, Red Bull maximised floor-generated downforce on their 2022 car (RB18) and beyond, allowing them to run slightly smaller wings for less drag, resulting in a very quick and well-balanced car.
Ground effect is not a different kind of force – it’s still generating downforce – but it’s a smarter way of doing so compared to just adding bigger wings. It has redefined how teams approach aerodynamic design in F1, making underbody design as critical as the wings on top of the car.
