AUSTIN, Texas — Engineers from Mercedes and Ferrari say the restricted apply time afforded by F1’s dash format was a contributing issue within the pricey setup errors they made on the U.S. Grand Prix.

Lewis Hamilton was stripped of his second-place end on the Circuit of the Americas and Leclerc of his sixth-place end after each automobiles had been disqualified for extreme put on to the resin plank fastened to the underside of their automobiles.

The plank is product of a cloth that wears away because it skids alongside the observe floor, partly defending the underside of the automobile but in addition permitting the FIA to make sure a minimal journey peak is maintained.

Working the automobile low to the bottom can yield extra efficiency from the underfloor aerodynamics, but in addition runs the chance of inducing probably harmful losses of downforce because the automobile bottoms out.

With a purpose to make sure the automobiles run in a secure situation, the FIA screens plank put on by measuring 4 holes within the plank that should be 10mm deep (+/- 0.2mm) initially of the race and a minimum of 9mm deep on the finish of the race.

After the U.S. Grand Prix, the depth of the holes was checked on Hamilton’s Mercedes, Leclerc’s Ferrari, Max Verstappen’s race-winning Purple Bull and Lando Norris’ McLaren. Solely the Mercedes and Ferrari had been discovered to be in breach because of extreme put on to the plank materials, resulting in their disqualification.

The dash format, which was used for the fifth time this 12 months over the Austin weekend and options qualifying for Sunday’s grand prix on Friday afternoon, means setup choices like journey heights should be made after a single hour-long apply session as an alternative of the standard three apply periods of a traditional race weekend.

As soon as qualifying begins, the automobiles enter what is called parc ferme, which severely limits setup adjustments and exists to cease groups growing one specification of automobile for single-lap efficiency in qualifying and one other specification for the calls for of a full race distance.

Talking after the disqualification, Mercedes’ trackside engineering director Andrew Shovlin stated the mixture of restricted apply time and the bumpy floor on the Circuit of the Americas had led to his crew’s mistake.

“We’re in fact naturally very disenchanted to lose our podium end,” he stated. “Sadly, it is likely one of the pitfalls of the dash format the place we have now a solitary hour of working earlier than parc fermé.

“With out working at a race gas load in FP1, mixed with a circuit as bumpy as this and the elements of the observe the place the drivers should put the automobile throughout the Grand Prix, have contributed to the upper than anticipated put on ranges. We are going to go away and study from this but in addition take the positives from our expertise as a complete.”

Ferrari sporting director Diego Ioverno listed related causes for his crew’s error, but in addition cited the change in wind depth and course in Sunday’s race.

“The dash weekend may be very peculiar and you’ve got little or no time to organize the automobile — mainly just one session and then you definitely go in parc ferme,” Ioverno stated. “It signifies that second onwards you can’t contact the automobile any extra. On high of this, Austin is a brilliant good observe however this can be very bumpy.

“Bumpiness is a tough matter for drivers and for automobiles, up to now nearly everybody failed the suspension and failed the chassis. We knew it could have been tough and that is the rationale why we additionally lifted the automobile all through FP1, and from our consideration it ought to have been OK.

“As a matter of truth, it turned out we had been anyhow too marginal and likewise due to the wind that modified course and had a stronger depth than what was forecasted, this introduced our automobile to not be authorized on the finish.

“There may be not so much to say and never so much on this second that we will do. With hindsight, rewinding the weekend we might have lifted much more the automobile however we might have misplaced efficiency, and we’re right here all the time to attempt to optimise our personal efficiency.”

Mercedes crew principal Toto Wolff added: “Setup selections on a dash weekend are all the time a problem with only one hour of free apply — and much more so at a bumpy circuit like COTA and working a brand new bundle.

“In the long run, all of that does not matter; others received it proper the place we received it mistaken and there is no wiggle room within the guidelines. We have to take it on the chin, do the educational, and are available again stronger subsequent weekend.”