Q: What does a Gurney flap actually do?
A Gurney flap is a small vertical lip fitted at the trailing edge of a wing. It sharpens the pressure difference between the wing’s upper and lower surfaces, so airflow stays attached longer underneath and pressure recovery improves at the rear. The result is more downforce for a relatively small drag penalty. On the UP Ascension-RR rear wing, that means added rear grip without touching the wing’s angle setting.
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