The 2026 Formula 1 season has barely begun, and already drivers are raising red flags about the sport's revolutionary new technical regulations. At the forefront of these concerns is Ferrari's Carlos Sainz, who has delivered a scathing assessment of the newly introduced Straight Line Mode (SLM), describing it as nothing more than a temporary fix for deeper power unit problems.
Following a challenging Australian Grand Prix where he started from the back of the grid due to Energy Recovery System failures, Sainz witnessed the SLM's debut in race conditions from a unique perspective. His view from 21st position gave him a clear sight of the entire field navigating the opening lap, and what he saw left him deeply troubled about the system's safety implications.
The Core Problem: Energy Deployment Deficiencies
The 2026 regulations mandate a fundamental shift in power unit architecture, requiring a 50/50 split between traditional combustion power and electrical energy. While this move aligns with Formula 1's sustainability goals, it has created significant challenges in energy management during races. The new hybrid systems consistently run out of electrical boost down long straights, leaving cars vulnerable to significant performance drops.
SLM was conceived as a solution to this exact problem. The system allows drivers to activate moveable aerodynamic elements to reduce drag and increase top speed when electrical energy reserves are depleted. However, Sainz argues this is treating the symptom rather than the disease.
"It's a plaster on top of the engine to protect the deployment issues we have," Sainz stated bluntly during media sessions in Melbourne. His assessment cuts through the technical jargon to highlight a fundamental flaw: the sport has implemented a workaround instead of addressing the root cause of the power unit's energy shortfall.
Lap 1 Chaos: A Recipe for Disaster
Sainz's primary concern centers on the opening lap, where 20 cars charge into the first corner in close proximity. The Australian Grand Prix marked the first time SLM was used in earnest during a race start, and the experience validated his worst fears.
"The biggest worry for me about the racing is Lap 1. It felt like it was really sketchy with SLM on everyone on the back straight," Sainz explained. "It felt really dangerous, very difficult to control the car in slipstream and SLM."
The combination of slipstreaming—where cars gain speed by running in the aerodynamic wake of competitors—and SLM activation creates unpredictable handling characteristics. Drivers must manage sudden changes in downforce and balance while navigating tight packs at maximum velocity, a scenario Sainz describes as "sketchy" and difficult to control.
Cornering Complications: Beyond Straight-Line Speed
While SLM might function adequately on pure straights, similar to the previous DRS system, its application becomes problematic when corners are involved. The Albert Park circuit features several fast, curved sections where the line between "straight" and "corner" blurs.
"When there's a bit of cornering and both cars are using SLM, it becomes like there's cornering in Turn 7, 8 on that back straight, it feels sketchy also," Sainz noted. The issue arises from the dramatic shift in aerodynamic balance when SLM engages. As the system reduces drag, it simultaneously reduces downforce, compromising the car's stability through curved sections.
This creates a dangerous scenario where two competing drivers might activate SLM at slightly different points, or where the system's activation coincides with steering inputs for a gentle curve. The result is a car that feels unsettled and unpredictable—hardly ideal when racing wheel-to-wheel at over 300 km/h.
FIA's Flip-Flop: A Zone Removed, Then Restored
The safety concerns are not merely theoretical. The FIA itself acknowledged the risks when it initially announced the removal of a fourth SLM zone at Albert Park. The section from Turn 6 to Turn 9—a fast, curved run around the lake—was deemed too dangerous for SLM activation.
However, in a move that underscores the complexity of the issue, the governing body reversed its decision just hours later after intense lobbying from teams. The reinstatement suggests that without SLM in that section, the energy deployment problems would have been even more severe, potentially creating performance differentials that presented their own safety risks.
Sainz remained unimpressed by the back-and-forth. When asked if removing SLM from curved sections was the right approach, he doubled down on his criticism: "The SLM is the plaster on top of the issue of the engine. And then when you come to circuits like this that are energy starved, you end up having to use SLM in places where we shouldn't to protect the deployment."
The Bigger Picture: A Systemic Challenge
The Spanish driver's comments highlight a deeper issue within the 2026 technical framework. The sport's push toward electrification has created power units that, while technologically advanced, struggle to deliver consistent performance throughout a race lap. SLM represents an attempt to paper over this gap, but in doing so, it introduces new variables that compromise safety.
This tension between sustainability goals and racing integrity is not new to Formula 1, but the 2026 regulations have amplified it. The 50/50 power split, while environmentally progressive, has fundamentally altered the car's behavior in ways that even seasoned veterans like Sainz find alarming.
Looking Ahead: Implications for the Season
As the championship moves to circuits with different characteristics, the SLM debate will likely intensify. Tracks with long, curved sections—such as Silverstone or Suzuka—could expose the system's limitations even more dramatically. The FIA may face pressure to create circuit-specific SLM regulations, adding another layer of complexity to race management.
For drivers, the immediate concern is establishing clear guidelines on when and where SLM can be safely deployed. The current one-size-fits-all approach appears untenable, particularly on circuits that don't feature traditional straight-line sections.
Sainz's blunt assessment serves as a warning shot to the sport's decision-makers. While the technical regulations were designed to create closer racing and promote sustainability, they may have inadvertently introduced a safety variable that could have serious consequences.
The "plaster" analogy is particularly telling—it suggests a temporary, inadequate solution to a problem that requires fundamental rethinking. As teams gather more data and drivers gain more experience with the new power units, pressure will mount on the FIA and Formula 1 management to address the root cause rather than relying on workarounds that compromise safety.
Until then, drivers like Sainz will continue to voice their concerns, hoping that their warnings are heard before an incident forces the issue. The 2026 season promises to be one of the most technically fascinating in recent memory, but as the Australian Grand Prix demonstrated, the path to innovation is fraught with challenges that extend beyond pure performance.