Flexing rear wing

A rear wing that passed the static load tests but deflected under high-speed aerodynamic load, shedding drag on the straights.

The Article 3.9.6 and 3.9.7 numeric limits were passable by a wing designed around the test rather than around the intent.

Straight-line speed.

Revised rear wing load tests introduced from the French GP on 20 June 2021, under the Article 3.9.9 reservation clause. The regulation text itself was never rewritten.

A clampdown that changed no regulation text at all. Any register built by diffing regulation documents would show nothing happened in 2021, which is exactly why diffing alone is not enough.