- An aerodynamic device used to improve traction by increasing the downward force on either end of the car. It can be compared to an airplane wing with this primary difference: A wing is designed to provide lift so it can fly; the air foil pushes the vehicle closer to the ground. Although they may be called "wings," they are properly air foils. They increase the cornering ability, improve stability, but add aerodynamic drag.
Dictionary of automotive terms. 2015.
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air|foil — «AIR FOYL», noun. 1. a wing, aileron, rudder, or other surface designed to help lift or control an aircraft. 2. a spoiler or similar device designed to help keep a car firmly on the road at high speeds … Useful english dictionary
air foil — /ˈɛə fɔɪl/ (say air foyl) noun the winglike structure fitted above the body of many sporting and racing cars to give firmer traction and allow faster cornering … Australian English dictionary
foil — A light, thin, blunt edged sword from which an air foil is named. See air foil hydrofoil … Dictionary of automotive terms
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foil — I UK [fɔɪl] / US noun Word forms foil : singular foil plural foils 1) [uncountable] very light thin sheets of metal used for wrapping things, especially food Wrap the cheese in foil to keep it moist. 2) [countable, usually singular] someone or… … English dictionary