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Downforce is a downwards lift force created by the aerodynamic features of a vehicle. If the vehicle is a car, the purpose of downforce is to allow the car to travel faster by increasing the vertical force on the tires, thus creating more grip .
IndyCars did not use ground effect as substantially as Formula One. For example, they lacked the use of skirts to seal off the underbody of the car. IndyCars also rode higher than ground effect F1 cars and relied on wings for significant downforce as well, creating an effective balance between over the car downforce and ground effect.
The DRS allows the flap to lift a maximum of 85 millimetres (3.3 in) from the fixed main plane. This reduces drag from the wing and results in less downforce. In a straight line, where downforce isn't needed, it allows for faster acceleration and potential top speed, unless limited by the mechanical limits of the engine and transmission.
Various other characteristics affect the coefficient of drag as well, and are taken into account in these examples. Many sports cars have a surprisingly high drag coefficient, as downforce implies drag, while others are designed to be highly aerodynamic in pursuit of a speed and efficiency, and as a result have much lower drag coefficients.
The downforce F1 cars create can lift objects from a track surface if they are not secured. It’s not too uncommon for an incident like this to happen at a temporary street track.
Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds.
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