Gurney Flap Meaning in NASCAR

A Gurney flap is a small vertical tab on the rear spoiler edge. Teams use it to increase rear downforce. The flap alters airflow separation behind the car. Increased downforce improves rear grip in corners. During a high speed event crews adjust the Gurney flap height for balance. Officials regulate maximum dimensions strictly. Too much angle increases aerodynamic drag. Engineers test flap settings for optimal tradeoffs. Drivers feel improved stability at corner exit. Proper installation prevents vibration at speed. Teams secure the flap firmly before competition. Minor adjustments produce noticeable handling changes. The Gurney flap fine tunes aerodynamic performance.