Spyker F8-VII - rear-wing fin 21 February 2007
Though it won't necessarily be fitted for March's Australian Grand Prix, there's currently an interesting addition to the F8-VII's rear wing - a vertical fin (arrow) in the middle of the main profile and flap. This has a double purpose. Firstly, it keeps the main profile and the flap rigid. Secondly - and arguably more importantly - it acts as a sort of turning vane, splitting the airflow that hits the main profile and flap in two, reducing the drag generated by these elements. It also creates a depression of negative pressure, which in turn will increase the speed of the airflow exiting the rear wing and improve the extraction of air from the rear diffuser.