Andrea Kimi Antonelli endured his most difficult qualifying session of the season in Singapore, struggling even more than he had at Sepang and finishing around half a second behind George Russell. Such an unusual gap cannot simply be explained by driving performance and instead highlights how difficult the Italian is finding it to extract confidence and lap time from the current balance of the updated Mercedes W17.
The latest Mercedes package has increased the car’s aerodynamic potential, but the bigger question is how much of that theoretical gain can actually be exploited on track. The updated W17 appears to be more rear-limited than the previous specification, with rear-tyre management becoming more difficult. Mercedes, however, believes it is still too early to draw definitive conclusions and needs further work to distinguish set-up problems from characteristics inherent to the new package.
Mercedes W17 understeer creates problems at the rear
Andrea Kimi Antonelli has complained of pronounced understeer that Mercedes has so far been unable to eliminate. The difficulty in making the W17 rotate properly affects more than simply corner entry and mid-corner performance.
When the front of the car does not turn sufficiently, Andrea Kimi Antonelli has to maintain greater steering angle as he begins to accelerate. That can increase instability at the rear, meaning the two problems potentially reinforce one another: a front axle that fails to complete the desired trajectory can also make life more difficult for the rear tyres.
The issue is therefore not simply how much aerodynamic load the new package produces. What matters just as much is how that load is distributed and how stable the aerodynamic balance remains under different conditions.
Mercedes sidepod changes could narrow the W17 operating window
Development around the sidepods can generate improvements in factory data by changing the interaction between the bodywork and the floor and increasing overall aerodynamic load. On track, however, the same concept can potentially expose the rear tyres to greater turbulence and aerodynamic disturbance if the airflow reaching the back of the car is not sufficiently controlled.
A stronger downwash effect does not automatically produce a better-balanced car. The way the airflow reaches the rear of the W17 is also crucial, particularly while the car is steering or changing attitude through a corner.
If an increase in downforce is accompanied by greater aerodynamic sensitivity, the driver can end up with a car that is theoretically more capable but more difficult to manage. The usable operating window then becomes narrower, making it harder to reproduce the maximum performance consistently.
That challenge is particularly relevant around Marina Bay, where low-speed rotation, traction and tyre-temperature control are all fundamental to lap time. The technical demands of the Singapore circuit place a heavy emphasis on precisely those areas.
Red Bull example shows why maximum downforce is not enough
Red Bull has previously encountered a similar development problem, moving through three different specifications before arriving at a solution that combined downwash with better protection of the rear of the car.
The advantage of that solution was not limited to maximum aerodynamic load. It also gave the driver a more manageable balance and allowed the available performance to be used across a wider range of conditions.
For Mercedes, one possible consequence of its current difficulties is increased rear-tyre sliding. That can make tyre temperatures harder to control while also increasing degradation.
Wheelspin under acceleration has another performance cost. Even strong energy deployment becomes less effective if the rear axle cannot transfer the available power cleanly to the track surface. Extra power offers limited benefit if the driver has to control wheelspin rather than converting that energy directly into acceleration.
Mercedes removes new front wing but continues with Antonelli upgrade package
Mercedes has also removed the new front wing, changing one of the components that contributes to the W17’s overall aerodynamic balance. But the evaluation of the complete package remains open.
A single component cannot fully explain the behaviour of a car that has undergone significant changes to its floor, sidepods and bodywork. That is why the team continues to investigate the complete aerodynamic interaction rather than attributing Andrea Kimi Antonelli’s problems to one isolated development.
Mercedes is not currently planning to return Andrea Kimi Antonelli’s car to the older specification. Regardless of what happens in the next qualifying session, the Italian will continue with the updated configuration.
The team’s work will instead focus on understanding the package and finding a set-up capable of converting its aerodynamic potential into usable performance. The central challenge is to reduce the understeer without placing even greater stress on the rear of the car.
That process also fits into Mercedes’ wider effort to understand how much potential remains in its latest developments. Toto Wolff has previously acknowledged that the team still has work to do with the W17 upgrade programme and its untapped performance, making the Singapore comparison particularly important for deciding which technical direction Mercedes should pursue.
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