Article 11.4

Plank Chamfer Application

Technical Regulations

Article 11.4

FIA Source

Plank Chamfer Application

Chapter: APPENDIX C2: REGULATION VOLUMES

In Simple Terms

After the floor of an F1 car is fully designed according to regulations, the sharp edges on the bottom must be rounded off (chamfered) to specific measurements. This is a safety and technical compliance requirement that prevents damage and ensures cars meet the exact specifications.

  • Chamfers must be applied to the lower edges of the plank after the volume is fully defined
  • Specific dimensions for chamfers are mandated by regulations to ensure consistency across all cars
  • This is a technical compliance requirement checked during car inspections
  • Proper chamfering prevents sharp edges that could cause damage or create unfair aerodynamic advantages
Official FIA Text

Once the volume in §11.3 is fully defined, chamfers of specified dimensions must be applied to lower edges.

plank chamferfloor edgetechnical regulationscar dimensionscompliance
2026 Season Regulations