It is by no means a coincidence that McLaren is once again fighting for the world championship. The difficult start to the 2026 Formula 1 season was linked to several issues, which have now been resolved. Then, in Miami, the first upgrade package arrived and the British car was completely transformed. Throughout the weekend, the MCL40 ran at Mercedes-level performance, sending a very clear message: the intention is to win again.
The floor inlet: Ferrari-inspired approach
The first major update concerns the floor inlet. The vertical vanes (fences) allowed by the regulations have changed shape, adopting a philosophy visibly inspired by Ferrari. The base of these elements is now flat and split horizontally in the middle. This configuration creates true flow channels, helping accelerate the air towards the lower part of the floor.
This represents a radical shift in approach, requiring a complete reshaping of all inlet vanes at the entrance of the Venturi channels. These are crucial elements for generating the vortex structures needed to increase downforce along the floor.
In addition, the outermost endplates produce an out-wash effect (diverting airflow outward) and work in perfect synergy with two horizontal profiles located in the bargeboard area.
Reprofiled bargeboards for airflow management
The bargeboard area, always a zone of different interpretations among teams, receives the second upgrade. In the new technical specification, the second vertical element abandons its previous triangular design in favor of a curved shape, enhanced by a small flap at its tip.
The leading edge of the first “shutter-like” elements has also been sharpened to better control the airflow directed toward the body of the car. On modern F1 cars, bargeboards must point inward to limit out-wash, which would otherwise disturb the aerodynamics of the following car.
Redesigning these elements modifies the pressure difference between both sides and alters the vortex detaching from them. The two lower profiles, featuring a narrow chord, instead help increase lateral extraction. Since the floor cannot be freely shaped in this area, these elements take responsibility for managing lateral airflow expansion.
McLaren: the introduction of the “mouse-hole” and anti-turbulence endplates
The area that likely provided McLaren with the greatest aerodynamic gain is the rear section, thanks to the introduction of the so-called “mouse-hole” (absent on the launch car). This small opening at the base of the diffuser ramp allows clean air to be fed directly into the diffuser, energizing the flow and delaying separation of the air stream.
The benefits are significant: the team can use more aggressive diffuser angles and achieve a far more stable aerodynamic platform across different driving conditions, a vital factor given the car’s natural dynamics.
At the same time, a micro-aerodynamic refinement has been carried out on the floor just ahead of the rear tyre, with adjustments designed to integrate the new mouse-hole.
Several slots can be seen here, connecting the upper and lower surfaces of the floor, with the essential goal of controlling the turbulent chaos generated by the rotating tyre. In the area next to the opening, the rear portion of the floor has also been shaped to generate a strong up-wash (airflow directed upwards). This creates a local high-pressure zone that not only adds extra downforce but also helps shield the turbulence created by the tyre.
Rear wing modifications
On the rear wing, Woking engineers have reshaped the vertical endplate, introducing small folds (an evolution of a concept already partially used in the previous specification). Although it may appear minor, this refinement affects the interaction between the tyre and the diffuser.
The main objective for every team is to maximise diffuser performance by using the low-pressure zone behind the tyre to improve airflow expansion. However, air tends to separate as it flows around the tyre, creating a barrier.
These new geometries help delay flow separation as it passes around the wheel, increasing rear expansion potential. By generating a micro-vortex, the airflow remains attached over a much wider range of conditions, including higher yaw angles.
McLaren and the FTM exhaust detail: Woking’s innovation
The final technical detail once again borrows an idea from Ferrari. Many teams have tried to replicate the now well-known FTM appendage developed in Maranello, carefully exploiting regulatory volumes.
Comparing Ferrari, Red Bull, and McLaren visually, it becomes clear that the MCL40 carries the smallest version of this element among the three.
Just like Red Bull, McLaren was forced to mount the component directly on the exhaust outlet section. It is not an ideal compromise, but it still generates downforce. However, at Woking, the engineers went one step further, building on the ideas of the team led by Andrea Stella.
The engineers managed to create an additional small profile located just beneath the exhaust (often highlighted in orange in technical analyses), designed to generate up-wash and additional downforce. On the sides of the impact structure, small profiles from the previous specification remain, helping both downforce generation and diffuser expansion.
Finally, there is an important indication ahead of the next championship round: the team will bring further upgrades to the MCL40 to strengthen its performance potential. McLaren took its time before introducing the first updates, but everything now suggests a multi-stage development plan designed to accelerate the car’s performance growth throughout the season.
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