More on the MCL40’s front wing…
Even though the wheels are narrower this season, they remain a chaotic influence on airflow: not just acting as a blockage by dint of size, but also inducing turbulence around the sides and base through their rotation – not to mention their profoundly messy wake. Anything you can do to steer air away from the wheels is worth exploring.
It’s worth mentioning that back in 2009, when the Brawn BGP001 turned up late in testing and blew rivals away, focus naturally turned to its controversial ‘double diffuser’ at the rear. But actually one of the car’s strongest suits was its relatively well-developed font wing, which was set up to ‘outwash’ air around the front wheels.
The front wing is the first part of the car to meet the air, so its characteristics have a strong influence on the flow fields the aerodynamicists are trying to set up around the rest of the car. Since outwashing is one of the factors which makes it difficult for cars to follow each other through corners, the front wing regulations are written to try to prevent teams from exploiting it. But teams, of course, are stuffed with clever people looking for loopholes in these rules.
In this case the top fin on the McLaren’s front wing is likely intended to generate a vortex at the tip which encourages airflow to follow it outside the front wheel.