F1, Mercedes offensive: what the W17’s new diffuser is hiding
The Mercedes W17 continues to evolve aerodynamically as the Brackley-based team works to widen the car’s operating window across every driving condition. The latest package focuses on several key areas, including a revised front end, a more aggressive floor designed to shield the rear wheels, and highly sophisticated diffuser refinements.
The overall objective is clear: optimize the W17’s aerodynamic efficiency and defend Mercedes against rivals attempting to close the performance gap to the German team.
The work carried out on the Mercedes W17 front end
The first major intervention concerns the additional wing profiles and their connection to the inner surface of the endplate. With the new evolution, these elements are now attached directly to the vertical fence at a lower point, allowing them to connect more directly with the floor edge.
With movable aerodynamic surfaces now part of Formula 1’s regulations, front wing design has become significantly more complex. Engineers are forced to optimize a difficult compromise between the two FIA-defined active aero configurations: straight mode and cornering mode.
Mercedes has also revised the dive-plane, an aerodynamic element notably absent on Ferrari’s car and previously highlighted by Lewis Hamilton as an area of weakness. This component plays a key role in generating outwash and controlling turbulence around the front of the car. Even the shape of the vertical fence itself has been modified, with changes to its curvature intended to alter the intensity of the vortex generated in that area.
Mercedes searching for more downforce through the floor
Mercedes has carried out particularly extensive work on the floor of the W17, fully aware that this area offers enormous potential gains in aerodynamic efficiency.
As highlighted by the new design, engineers introduced additional slots into the floor structure, connecting the upper and lower surfaces of the component.
In front of the rear tire — effectively an aerodynamic “wall” in modern Formula 1 — Mercedes developed new geometries to generate a high-pressure zone capable of shielding the wheel from disruptive airflow.
More specifically, a new vertical deflector can be seen redirecting airflow toward the outer section of the car. The concept is somewhat similar to the solution used on the McLaren MCL40, although Mercedes appears to rely on a noticeably different operating principle. In addition, the trailing edge of the floor now features a slight upward twist, a carefully engineered shape intended to help generate additional localized downforce.
The hidden detail on the Mercedes diffuser
The most technically significant detail, however, is found on the Mercedes diffuser itself.
Looking at the upper surface of the component, three small bulges are visible. Their presence strongly suggests the existence of corresponding indentations underneath the floor surface. This highly sophisticated geometry appears specifically designed to trigger localized low-pressure peaks, increasing extraction efficiency and boosting the vertical load generated by the floor. Unlike other aerodynamic concepts in Formula 1, these elements are not intended to generate vortices, mainly because this particular section of the car does not suffer from major airflow separation issues.
It is also worth noting that around these “bulk” sections, the floor edge adopts a jagged profile that effectively reduces the diffuser’s cross-sectional area.
Red Bull already explored similar diffuser concepts
This is not an entirely new idea in Formula 1. Similar geometries have already been explored in previous seasons, particularly by Red Bull.
Observing the Austrian team’s older designs reveals a very similar solution, suggesting that the Mercedes diffuser may represent the natural evolution of concepts first explored during the 2017 Formula 1 season.
Initial simulation data surrounding the major update package introduced by Mercedes in Canada reportedly satisfied the Brackley engineers and appears to have reduced part of Ferrari’s advantage in slower, more technical sections. However, only the detailed analysis of track data collected during race weekends will provide a definitive verdict on the effectiveness of the new package, especially given the limited testing opportunities available during Sprint weekends.
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