Roof flaps are two plates located on the roof which measure 12x8 inches 30x20 cm and are depolyed as the car is either sideways or going backwards at high speeds.
How do roof flaps work.
The flaps are stowed during normal vehicle operation.
Before this when the cars spun out at high speeds more than 195 mph 324 kph they would often fly into the air once they had rotated about 140 degrees.
Teams buy roof flap assemblies from roush yates.
There are two spacers for each flap making a total of eight spacers in the car.
In 1994 nascar introduced roof flaps a safety device designed to keep cars from going airborne and tumbling over the track.