A regulation introduced for the entire 2026 season. A weekend exemption granted on safety grounds. Two of the most innovative teams on the grid have just turned the exemption into an opportunity.

Mercedes and Red Bull have arrived at the Monaco Grand Prix with radical rear wing designs, exploiting a regulatory loophole opened by the FIA’s decision to ban active aerodynamics for the entire weekend. The two teams, joined by McLaren in pursuing a less extreme version of the same concept, have replaced the central activation mechanisms on their rear wings with intricate cascades of additional winglets that would not normally be permitted on cars running active aero. The result is a series of designs that look more like rear wing experiments from the 1990s than from the modern Formula 1 era.

The structural opportunity arose from a one-off ban. The FIA confirmed earlier in the week that active aerodynamics would not be permitted at Monaco, citing the high-speed barrier risk on a circuit where any sudden change in downforce could prove catastrophic. The decision marked the first time since DRS was introduced in 2011 that moveable wings would be unavailable for an entire Grand Prix weekend. With the rear wing locked in a single configuration across all sessions, the central actuator pod (the housing that normally contains the wing’s movement mechanism) became, in technical terms, an empty box. Mercedes, Red Bull and McLaren have refused to leave it empty.

The Mercedes design is the most radical. The Brackley team has removed its actuator pod entirely, replacing it with what RacingNews365 technical analyst Paolo Filisetti described as a complete redesign featuring a trio of cascading winglets on the mainplane-mounted pylon, with another winglet stacked above. Two further banks of winglets sit behind that arrangement, with Gurney flaps (small upturned edges that increase downforce by altering the airflow at the trailing edge) added to the final elements. The total package is a multi-element aerodynamic device that would be illegal on a car running active aero, because the dimensions and heights of all moveable surfaces are strictly defined by the regulations. Without movement, those constraints fall away.

Red Bull’s approach is described by analysts as similar in concept but less extreme in execution. The team has retained its standard actuator housing and modified it to incorporate two additional winglets enclosed by endplates, in a more surgical adjustment to an otherwise conventional structure. McLaren is running a comparable concept. Ferrari, in the specification seen so far, has chosen not to pursue this particular interpretation. Audi has used the same regulatory freedom to remove the bulky mechanism fairings it has used since the start of the season, with Cadillac following a similar approach. The grid is split between teams that have seen the opportunity and teams that have not.

The legality of the designs is structurally protected by the wording of the regulations. The dimensional restrictions on the rear wing are written with active aero in mind, defining how the moveable surfaces may behave when they open and close. The fixed-only configuration removes the application of those restrictions, opening a window of design freedom that exists only for as long as the active aero ban applies. Mercedes’ design would be immediately illegal at any other Grand Prix. Red Bull’s would likely fail the standard wing-flexibility tests run at other circuits. The loophole is real, and it is closed everywhere except Monaco.

The performance implication is meaningful within Monaco’s specific context. The Principality is the highest-downforce circuit on the calendar, and the only one where aerodynamic drag is genuinely irrelevant. The cascade of additional winglets adds downforce at the cost of drag the teams do not need to pay. For a single weekend on a circuit where pole position routinely converts to victory, the marginal gain in cornering grip from the radical wings could be decisive. Mercedes goes into Friday practice with the most aggressive interpretation of the loophole. Red Bull and McLaren have pursued less extreme versions. Whichever approach proves fastest, the Monaco rear wings will be one of the defining technical stories of the weekend. The loophole closes again on Monday. What the teams have done with the four days in between will define how they spent it.

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