McLaren have finally jumped into Renault's and Ferrari's footsteps by adding little winglets at each side of the cockpit. The idea was already introduced in 2006 by Honda but back then in the form of a thicker element. Renault then also started using it in 2006 while Ferrari introduced their 'knives' earlier this year. All designs are some kind of a lift generating aerofoil ahead of the mirrors to direct a little extra airflow into the sidepod inlets. Its effects are highly unpredictable, but it may well slightly improve cooling and allow for a little extra downforce towards the end of the car.
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