McLaren to modify rear wing after ‘mini-DRS’ controversy

McLaren will modify its rear-wing design in the wake of the controversy over its ‘mini-DRS’ after a request from the FIA.

With rival teams questioning the legality of the McLaren rear wing after the Azerbaijan Grand Prix, as the upper element appeared to rotate back to open up the slot gap, the FIA has been carefully looking at its design.

And although there are no doubts that the wing fully complies with the current regulations, and passes all the static tests, it is understood that the FIA has requested for changes to be made.

While McLaren will still be allowed to use the exact low-drag wing that it raced in Baku on the type of tracks it is designed for, it has been told that it needs to make alternations that will prevent the upper element from flexing in the manner it has.

Although the demands of the FIA regulations purely relate to wings passing static load tests, there are other aspects to the wing behaviour that count too in terms of legality.

These have been made clear in a long-standing technical directive to teams. It states that, while it is natural for parts to flex when exposed to increased aero load, the FIA does not deem components that are deliberately designed to move in a specific manner.

In TD34, the FIA states that it does not consider legal: “designs whose structural characteristics are altered by secondary parameters, so as to produce (whilst running at the track) a different deflection characteristic than when stationary during the FIA checks. Examples of secondary parameters could be temperature, aerodynamic load etc.”

The FIA’s decision to ask McLaren to modify its rear wing came in the wake of some unease from rival teams over what the design was done.

And while the FIA had previously brushed away team concerns about flexible front wings, it had left the door for taking action about what was happening at the rear.

This will ease concerns from teams that, if the McLaren design was given the all-clear, then it could open an arms race for teams to try to further exploit the regulations.

One team boss told Motorsport.com: “Aero elasticity has been a factor for many, many years now, and even if a wing passes the FIA test the regulations remain very clear – the component cannot be designed to flex.

“We rely on the FIA to say, okay, what are the boundaries of that? Of course, everything will flex to a certain degree, but what…