For the 2026 Formula 1 season, the Aerodynamic Test Period (ATP) will play a decisive role in car development. At this point in the year, all teams have already outlined most of their upgrade plans for nearly the entire season. However, without having run on track yet, only a portion of updates can be fully scheduled. Teams must also remain ready to react to unforeseen problems, especially given that the new regulations are largely untested.
F1 2026: rules on tools teams can use for development
Aerodynamic development is strictly controlled through the ATP system. The FIA divides the year into six periods, each with a fixed number of weeks, during which teams are allocated a specific number of hours in the wind tunnel. This allocation forms the foundation of research and development, allowing teams to plan work based on the runs they can execute.
Typically, each ATP period lasts eight weeks, though exceptions exist. At the end of each cycle, production planning is crucial to bring finished components to the track as soon as possible. The number of wind tunnel hours available is based on the previous season’s Constructors’ Championship standings. Ferrari, having finished fourth in 2025, holds a small advantage over their direct rivals for 2026.
Each period provides 400 hours of wind tunnel “occupancy.” The FIA also applies a “C coefficient,” which reduces this time according to last year’s ranking. The last-placed team in 2025, Alpine, will receive 115% of these 400 hours, while McLaren, who won the Constructors’ Championship, will be limited to just 70%. Similar restrictions apply to CFD (computational fluid dynamics) simulations, limiting both the number of new geometries testable—referred to as 3D New Restricted Aerodynamic Test Geometries—and computational power. Teams start with a base of 2,000 geometries, with percentages adjusted based on last year’s standings. Last-placed teams can test more geometries, while McLaren is capped at 1,400.
Pre-season tests at the end of January set the development path
The first ATP period begins on January 1, giving teams the final tranche of wind tunnel simulations to test their concepts. Pre-season testing is scheduled in Barcelona from January 26 to 30, marking the cars’ first on-track appearance. From this moment, teams will race to identify weaknesses and areas for improvement, benchmarking themselves against competitors in every aspect.
Time on track will be precious. Any reliability issue translates into a major problem, potentially affecting early development. Teams will follow detailed programs for every lap, aiming to gather as much data as possible. Early and accurate development decisions can deliver a significant competitive advantage.
By the Bahrain tests at the end of February, teams will have a clear understanding of their cars’ performance, laying the groundwork for further upgrades. The first ATP period concludes on March 1. The second and third periods follow the same “C coefficient” rules. Everything changes with the fourth ATP period, which starts on July 1, 2026.
June 30: a key deadline for team development strategy
According to FIA regulations, June 30—the end of the third ATP period—represents a critical point in the season. If a team predicts strong performance placing them among the top ranks by this date, they know that starting July 1 their allocated wind tunnel and CFD hours will be reduced. As a result, teams plan to use extra resources and complete as many upgrades as possible in the first half of the year.
This approach is particularly relevant for Ferrari and Red Bull, less so for McLaren or Mercedes, who do not face this scenario. Continuous development throughout the season requires consistent strategy and careful timing of upgrades.
Teams must prepare a strategic plan, ready to react to on-track findings. They begin with a “Plan A” aligned with ATP deadlines, then switch to secondary plans based on evolving conditions. If initial test data does not correlate with CFD and wind tunnel results, development may be paused to recalibrate. The objective is to improve correlation between simulation and on-track performance, even if it means “losing” an ATP period.
Therefore, the pre-season tests in Barcelona are crucial. Each team must predict their Constructors’ Championship position by June 30 based on early test data. Although this data may appear unclear to the public, it provides teams with a precise performance baseline. Should the real standings deviate from predictions, teams must reallocate resources for the second half of the season, effectively rewriting their ATP development plans to recover lost ground.
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