Agile Formula 1 cars are the expression of a regulatory revolution that has touched every aspect of modern single-seaters. While most of the attention is understandably focused on power units and the new generation of movable aerodynamics on the wings, there are other important changes that affect extremely sensitive areas in defining overall performance.
Audi, with its filming day on Friday in Barcelona, was the first Formula 1 team to offer an initial glimpse of what the new agile cars will look like. These are the machines that, from this season onward, will replace the ground-effect cars that dominated the grid between 2022 and 2025.
When describing the scale of the changes, it is entirely appropriate to speak of a regulatory revolution. Chief designers have been able to carry over very little from the 2025 cars, as the new rules have impacted every area of the single-seater. The RS26, seen in the first spy images, clearly shows how dimensions have changed in terms of length, width, and weight, while the new Pirelli tyres are noticeably narrower.
At the same time, a fierce controversy has erupted around Mercedes’ power unit solution, which would allow the Brixworth-built V6 to increase its compression ratio under operating conditions while still respecting the ambient-temperature checks that impose a maximum value of 16:1. The potential power gain for Mercedes is estimated at more than ten horsepower, translating into an advantage of around two and a half tenths of a second per lap.
This is effectively equivalent to a major aerodynamic upgrade. It is therefore no surprise that Ferrari, Honda, and Audi are pushing back strongly, with the Technical Commission scheduled for January 22 expected to address what the FIA intends to do after having already deemed the solution developed by Hywel Thomas’ engineers to be legal.
Many more points of attention will emerge as the season progresses, because the regulatory changes affect every part of the car. The inability of the MGU-K to guarantee electric energy for an entire lap due to recharging limitations has forced the rule-makers to introduce debatable solutions that have significantly complicated the work of the engineers.
It is worth remembering that this regulatory chaos was decided by the leadership of the automotive manufacturers who wanted to play a leading role in Formula 1 during this cycle. At the time, they were still strongly influenced by the idea of ecological transition and mandatory electrification, which is now proving far more complex than expected, despite the pressure of Europe’s aggressive political strategies.
Car buyers are increasingly disoriented and resistant to imposed solutions. The result is a European automotive industry in deep crisis, which in turn facilitates the rapid expansion of Chinese manufacturers across global markets thanks to highly competitive prices and extremely advanced technologies.
Setting political considerations aside and returning to technical matters, other interesting aspects emerge. In an effort to limit downforce loss when a car is following another closely, thereby promoting overtaking, and to achieve excellent aerodynamic efficiency that allows teams to make better use of limited electric energy, the FIA has introduced movable wings at both the front and rear. At the same time, ground effect has been removed, with a flat floor making its return.
Among the secondary details that have so far received little attention are further elements that will make it more difficult to recover certain levels of downforce. For years, the cascade of profiles and small winglets integrated into the rear brake duct played a fundamental role in shaping airflow and generating downforce in a strategic area of the car, one that is heavily affected by turbulence generated by the rotating wheel.
With the 2026 regulations, the FIA has chosen to intervene precisely in this delicate area. The flap cascade also contributes to more efficient air extraction from the diffuser, helps clean up aerodynamic losses, and generates vertical load. This is therefore a genuine performance-generating zone. Under the new rules, the flaps positioned below the wheel centreline must be attached to the diffuser, while those mounted above remain part of the brake duct assembly.
This may seem like a minor change, but it is expected to have a noticeable impact, at least in the early stages of agile car development. The aerodynamic elements attached to the diffuser will no longer follow the vertical oscillations of the wheel, as they did in the past, while this movement will continue for the components that remain part of the brake duct.
The result will be the generation of instabilities that teams are currently evaluating through extensive wind tunnel work. It is another area that is difficult to spot from the outside, but one that will be particularly interesting to monitor and analyse throughout the season.
Leave a Reply