Work is progressing on the bodywork. GROUND EFFECTS For 50 years racing cars have utilised wings (inverted airfoils) to increase the levels of grip provided by the tyres. 35 years ago another aerodynamic device called 'ground effects' was introduced. The 'ground effect' phenomenon is based on Bernoulli’s equation, known as one of the basics of Fluid Mechanics Theory, that states the following: if fluid flows through a constriction, its speed will rise and pressure will fall.