Article C3.6.2
Plank
Technical Regulations
Article C3.6.2
Plank
Chapter: C3
In Simple Terms
The plank is the flat protective board under the car that must be made of specific materials with controlled density to ensure safety and fair competition. It can be a solid piece or have hollow pockets, but these pockets must follow strict location and thickness rules to maintain structural integrity.
- Plank material must have specific gravity between 1.3-1.45 (or 1.3-1.65 for upper surface if pocketed)
- Maximum of three separate pieces allowed in the plank construction
- Pocketing (hollow areas) only permitted in the central section with minimum 10mm clearance from all edges
Official FIA Text
Plank material homogeneous with specific gravity between 1.3 and 1.45, or if pocketed be bonded assembly with upper 0.5mm of specific gravity 1.3-1.65. May comprise no more than three pieces. Pocketing permitted between XF=630 and XC=-800 with periphery not less than 10mm from edges.
plankspecific gravitymaterial densitypocketingcar protection
2026 Season Regulations