McLaren Disqualification Rooted in Unexpected Porpoising

The root cause of McLarenS double disqualification in the Las Vegas Grand Prix lies in the team’s cautious set-up choices inadvertently triggering unexpected porpoising.

McLaren drivers Lando Norris and Oscar Piastri were disqualified from second and fourth in Vegas after thier cars breached Formula 1’s rules around minimum skid block thickness after the race.

The team’s initial explanations on Saturday night in Vegas, than again on Thursday ahead of this weekend’s race in Qatar, centered on unexpected aerodynamic oscillations (porpoising) causing the car to ground excessively during the race.

McLaren has emphasized the margin it took in setting its car up for qualifying and the race, given limited dry running in practice. The excessive wear wasn’t due to the car running too low – the typical assumption when a car aggressively targets ride height.

As Norris said on Thursday in Qatar: “The issue was the porpoising, it wasn’t as we were just running low. Sometimes it can be the opposite.”

McLaren’s cautiousness on the set-up most likely involved running slightly higher rear ride height than normal. Counterintuitively, running the car higher ultimately caused more wear becuase of the resulting effects.

Practice sessions hadn’t indicated McLaren would suffer from porpoising, a rapid series of detachments and reattachments of airflow under the floor causing it to rise and fall several times per second.

Porpoising was a major problem at the start of the ground-effect rules in 2022 but has been infrequent since 2023. In Vegas, it unexpectedly returned for mclaren to a severe extent, causing notable impacts with the track surface.

This wore the skids on the McLaren more than usual, rather than the team being overly aggressive in judging the ride height demands of the street track after compromised practice sessions.

the slightly higher ride height, combined with the high-speed and bumpy circuit, moved the car into a window where it was vulnerable to porpoising, which can be triggered in various ways.For example, bumps in the track surface can initiate airflow disruption.

had McLaren been more aggressive with its ride height choices, it probably would have been less susceptible to the issue.