How Do Roof Flaps Work

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.

How do roof flaps work.

Roof flap spacers are metal disks that sit in the tray and give the roof flaps something to rest on so that they remain level with the roof surface. A roof flap is an aerodynamic feature on race cars mainly stock cars which functions as an emergency spoiler to prevent the vehicle from lifting off the ground. In 1994 nascar introduced roof flaps a safety device designed to keep cars from going airborne and tumbling over the track. Teams buy roof flap assemblies from roush yates.

However in certain situations e g if the vehicle goes into a spin particularly if it is facing backwards the flaps deploy to disrupt the air flow over the roof and reduce.