-
Ground effect
Colin Chapman's Lotus 78 and 79 used the underside of the car as a wing, and the rules had not thought to say anything about it.
-
Sliding skirts
The seal between the floor and the road was what made the downforce, and banning it for 1981 removed most of the effect at a stroke.
-
The fan cars
Gordon Murray's Brabham BT46B, cooled by a fan that also extracted air from beneath the car, won at Anderstorp in 1978 and was withdrawn afterwards.
-
Flat floors
A mandatory flat floor from 1983 wrote the shape of the underbody into the rules and moved the argument to the diffuser behind it.
Other sections