Downforce system for a vehicle

A downforce system for a vehicle, the downforce system comprising:

• a restrictor configured to define a region under the vehicle, and to restrict a flow of air into the region under the vehicle;
• a pressure source configured to generate a pressure differential across the restrictor;
• and
• a sensor configured to detect an operating condition of the downforce system;
• wherein the downforce system is configured to control a position of the restrictor and/or an operation of the pressure source based on an output from the sensor.

A vehicle comprising:

• a first skirt mounted to an underside of the vehicle and extending toward a ground surface, the first skirt being configured to define at least in part a first bounded region beneath the vehicle;
• a second skirt mounted to the underside of the vehicle and extending toward the ground surface, the second skirt being configured to define at least in part a second bounded region beneath the vehicle;
• and
• at least one pressure source configured to extract air from at least one of the first bounded region and the second bounded region;
• wherein:
• each of the first skirt and the second skirt is movable between:
• a deployed position in which the skirt forms the at least partial seal with the ground surface, and
• a stowed position in which the skirt is spaced from the ground surface;
• a control system is configured to control deployment of at least one of the first skirt or the second skirt.