Article C3.18.8

Floor Board Flexibility

Technical Regulations

Article C3.18.8

FIA Source

Floor Board Flexibility

Chapter: C3

In Simple Terms

The floor of an F1 car must be rigid and stable. When tested with weights pushing down on it, the floor can only bend a maximum of 5mm in the middle section, and no more than 7mm around the edges. This ensures all cars have similar, predictable aerodynamic performance and safety.

  • Floor can deflect maximum 5mm when 100N load applied at the center measurement point
  • Floor can deflect maximum 7mm when 60N lateral loads applied at any edge point
  • Testing uses standardized 25mm diameter adapters to ensure consistent and fair measurement across all teams
  • Flexible floors would create unpredictable aerodynamic advantages, so this rule keeps competition fair
Official FIA Text

Floor bodywork may deflect no more than 5mm when 100N vertical load applied at [XF, Y]=[695, ±720]. Also must deflect no more than 7mm when load of [0, ±60, 0]N applied at any periphery point. Loads applied using weights through 25mm diameter adapters with 2.3mm rods through holes.

floor flexibilityfloor stiffnessdeflection limitsbodywork rigidityaerodynamic stability
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