'Porpoising' is a high-frequency bouncing motion seen on cars at high speed. It's caused by the ground effect aerodynamics stalling and re-attaching rapidly as the car's floor gets too close to the track surface.

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(1/2) Ground effect cars, using shaped underbodies and sliding skirts, generated huge downforce but were very sensitive to ride height. Skirt damage or bumps could cause a sudden loss of grip, leading to...

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