Sauber didn't introduce many upgrades at the Spanish Grand Prix, but one small change to the C33 came in the form of a leading edge slat. Sandwiched between the side of the cockpit and the outboard vortex generator, the horizontal winglet (see highlighted section) helps stabilise airflow over the sidepod. Working in tandem with the aforementioned vortex generator the slat works the airflow as it moves over the sidepod. The idea is to increase the operating window of the sidepod, providing performance through a wider speed range. Ordinarily as speed builds, the airflow passing over the sidepod creates a thicker boundary layer toward the surfaces rear-end. At a certain point that airflow...
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