Peter Wright and Colin Chapman discovered that by shaping the underside of the car as an inverted airfoil and with the use of side skirts to separate the airflow, they could accelerate the air passing under the car, reducing the air pressure under the car, creating a partial vacuum, effectively sucking the vehicle down to providing more grip and thus higher cornering speeds.
The beauty of this design is that the added down force didn’t come with added drag like conventional wings, meaning the increased cornering ability was not compromised by a decrease in straight-line speed. This gave Lotus an unfair advantage.
The video features the Type 78, the title winning Type 79, and the ultimate Ground Effect Car the Type 91. The first time Mario Andretti drove a ground effect Lotus, he described it as "being painted to the track." In 1978 Andretti won the F1 title in the Type 79.