Wings work the air that passes over the car�s body. But air travelling beneath the car is also harnessed. The regulations state that the underbody of the car must be flat up to the rear wheel axle line, but, from that location to the rear extremities of the car, anything goes. This rule has allowed designers to incorporate an upward-sweeping device, called a diffuser, beneath the engine and gearbox. The diffuser�s shape causes air to be sucked into its narrow opening which then opens out into a bigger area. Air fed through a shape such as this creates a pressure change that induces a suction effect.
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