Home - The Official Formula 1 Website Skip to content

Bodywork and dimensions

Published with permission from the Federation Internationale de l' Automobile.

ARTICLE 3: BODYWORK AND DIMENSIONS
For illustrations refer to drawings 1A-5A in the Appendix to these regulations here.
3.1 Wheel centre line:
The centre line of any wheel shall be deemed to be half way between two straight edges, perpendicular to the surface on which the car is standing, placed against opposite sides of the complete wheel at the centre of the tyre tread.
3.2 Height measurements:
All height measurements will be taken normal to and from the reference plane.
3.3 Overall width:
The overall width of the car, including complete wheels, must not exceed 1800mm with the steered wheels in the straight ahead position. Overall width will be measured when the car is fitted with tyres inflated to 1.4 bar.
3.4 Width ahead of the rear wheel centre line:
3.4.1
Bodywork width ahead of the rear wheel centre line must not exceed 1400mm.
3.4.2 In order to prevent tyre damage to other cars, the top and forward edges of the lateral extremities of any bodywork forward of the front wheels must be at least 10mm thick with a radius of at least 5mm. Providing it is inclined at an angle less than 60º to the car centre line, the forward edge of any horizontal part of the bodywork in these areas need not comply with these requirements.
3.4.3 In order to avoid the spread of debris on the track following an accident, the outer skins of the front wing endplates and any turning vanes in the vicinity of the front wheels (and any similarly vulnerable bodywork parts in this area), must be made predominantly from materials which are included for the specific purpose of containing debris.
The FIA must be provided with details of the way in which all such parts are constructed.
3.5 Width behind the rear wheel centre line:
Bodywork width behind the rear wheel centre line must not exceed 1000mm.
3.6 Overall height:
No part of the bodywork may be more than 950mm above the reference plane.
3.7 Front bodywork height:
3.7.1
All bodywork situated forward of a point lying 330mm behind the front wheel centre line, and more than 250mm from the centre line of the car, must be no less than 150mm and no more than 350mm above the reference plane.
3.7.2 All bodywork situated forward of a point lying 330mm behind the front wheel centre line must be no less than 50mm above the reference plane.
3.8 Bodywork in front of the rear wheels:
3.8.1
Other than the rear view mirrors, each with a maximum area in plan view of 12000mm², no bodywork situated more than 330mm behind the front wheel centre line and more than 330mm forward of the rear wheel centre line, which is more than 600mm above the reference plane, may be more than 300mm from the centre line of the car.
3.8.2 No bodywork between the rear wheel centre line and a line 800mm forward of the rear wheel centre line, which is more than 500mm from the centre line of the car, may be more than 500mm above the reference plane.
3.8.3 No bodywork between the rear wheel centre line and a line 400mm forward of the rear wheel centre line, which is more than 500mm from the centre line of the car, may be more than 300mm above the reference plane.
3.8.4 With the rear wheels removed and when viewed from above, no bodywork more than 500mm from the car centre line may lie between the rear wheel centre line and a point 400mm forward of it. Any bodywork forming the forward inner corner of these areas may have a radius no greater than 140mm.
3.9 Bodywork between the rear wheels:
3.9.1 No bodywork situated between the rear wheel centre line and a point lying 330mm forward of it, and which is more than 100 mm from the car centre line, may be more than 600mm above the reference plane.
3.9.2 No bodywork situated between the rear wheel centre line and a point lying 150mm behind it, and which is between 75mm and 480mm from the car centre line, may be located between 375mm and 600mm above the reference plane.
3.10 Height behind the rear wheel centre line:
3.10.1
No part of the car behind the rear wheel centre line may be more than 800mm above the reference plane.
3.10.2 No bodywork behind the rear wheel centre line, and more than 150mm each side of the car centre line , may be less than 300mm above the reference plane.
3.10.3 Any bodywork more than 150mm behind the rear wheel centre line which is between 300mm and 600mm above the reference plane, and between 75mm and 480mm from the car centre line, must lie in an area when viewed from the side of the car that is situated between 300mm and 375mm above the reference plane and between 150mm and 500mm behind the rear wheel centre line. When viewed from the side of the car no longitudinal cross section may have more than one closed section in this area.
3.10.4 Any bodywork behind the rear wheel centre line which is more than 600mm above the reference plane, and between 75mm and 480mm from the car centre line, must lie in an area when viewed from the side of the car that is situated between the rear wheel centre line and a point 350mm behind it. When viewed from the side of the car, no longitudinal cross section may have more than two closed sections in this area.
Furthermore, the distance between adjacent sections at any longitudinal plane must not exceed 15mm at their closest position.
3.10.5 In order to ensure that the relationship between these two sections cannot change whilst the car is in motion they must be bridged by means of rigid impervious supports (including any adjustment mechanism) arranged such that no part of the trailing edge of the forward section may be more than 250mm laterally from a support. These rigid supports must:
- fully enclose the two complete sections such that their inner profile matches that of the two sections. Their outer profile must be offset from the inner profile by between 8 and 30mm and may not incorporate any radius smaller than 10mm ('gurney' type trim tabs may however be fitted between the supports) ;
- not be recessed into the wing profiles ;
- be arranged so that any curvature occurs only in a horizontal plane;
- be between 2 and 3mm thick ;
- be rigidly fixed to the two sections. Some form of adjustment mechanism between the sections may be incorporated for the sole purpose of allowing adjustment of the sections relative to one another whilst the car is in the pits ;
- be constructed from a material with modulus greater than 50GPa.
These supports will be ignored when assessing whether the car is in compliance with Articles 3.9.1, 3.9.2, 3.10.1, 3.10.4 and 3.10.6.
3.10.6 No part of the car between 75mm and 480mm from the car centre line may be more than 500mm behind the rear wheel centre line. Any parts of the car less than 75mm from the car centre line and more than 500mm behind the rear wheel centre line must be situated between 200mm and 400mm above the reference plane.
3.10.7 In side view, the projected area of any bodywork lying between 300mm and 800mm above the reference plane and between the rear wheel centre line and a point 600mm behind it must be greater than 230000mm².
3.11 Bodywork around the front wheels:
With the exception of brake cooling ducts, in plan view, there must be no bodywork in the area formed by two longitudinal lines parallel to and 400mm and 900mm from the car centre line and two transversal lines, one 350mm forward of and one 800mm behind the front wheel centre line.
3.12 Bodywork facing the ground:
3.12.1
All sprung parts of the car situated more than 330mm behind the front wheel centre line and more than 330mm forward of the rear wheel centre line, and which are visible from underneath, must form surfaces which lie on one of two parallel planes, the reference plane or the step plane. This does not apply to any parts of rear view mirrors which are visible, provided each of these areas does not exceed 12000mm² when projected to a horizontal plane above the car, or to any parts of the panels referred to in Article 15.4.7. The step plane must be 50mm above the reference plane.
3.12.2 Additionally, the surface formed by all parts lying on the reference plane must :
- extend from a point lying 330mm behind the front wheel centre line to the centre line of the rear wheels;
- have minimum and maximum widths of 300mm and 500mm respectively;
- be symmetrical about the centre line of the car;
- have a 50mm radius (+/-2mm) on each front corner when viewed from directly beneath the car, this being applied after the surface has been defined.
3.12.3 The surface lying on the reference plane must be joined around its periphery to the surfaces lying on the step plane by a vertical transition. If there is no surface visible on the step plane vertically above any point around the periphery of the reference plane, this transition is not necessary.
3.12.4 The peripheries of the surfaces lying on the reference and step planes may be curved upwards with maximum radii of 25 and 50mm respectively. Where the vertical transition meets the surfaces on the step plane a radius, no greater than 25mm, is permitted.
A radius in this context will be considered as an arc applied perpendicular to the periphery and tangential to both surfaces.
The surface lying on the reference plane, the surfaces lying on the step plane, the vertical transitions between them and any surfaces rearward of the surfaces lying on the reference or step planes, must first be fully defined before any radius can be applied or the skid block fitted. Any radius applied is still considered part of the relevant surface.
3.12.5 All parts lying on the reference and step planes, in addition to the transition between the two planes, must produce uniform, solid, hard, continuous, rigid (no degree of freedom in relation to the body/chassis unit), impervious surfaces under all circumstances.
Fully enclosed holes are permitted in the surfaces lying on the reference and step planes provided no part of the car is visible through them when viewed from directly below.
3.12.6 To help overcome any possible manufacturing problems, and not to permit any design which may contravene any part of these regulations, dimensional tolerances are permitted on bodywork situated between a point lying 330mm behind the front wheel centre line and the rear wheel centre line. A vertical tolerance of +/- 5mm is permissible across the surfaces lying on the reference and step planes and a horizontal tolerance of 5mm is permitted when assessing whether a surface is visible from beneath the car.
3.12.7 No bodywork more than 150mm from the car centre line, which is visible from beneath the car and which lies between the rear wheel centre line and a point 330mm forward of it may be more than 125mm above the reference plane. Any intersection of the surfaces in this area with a lateral or longitudinal vertical plane should form one continuous line which is visible from beneath the car.
Additionally, any bodywork in this area must produce uniform, solid, hard, continuous, rigid (no degree of freedom in relation to the body/chassis unit), impervious surfaces under all circumstances.
3.12.8 All sprung parts of the car situated behind a point lying 330mm forward of the rear wheel centre line, which are visible from underneath and are more than 250mm from the centre line of the car, must be at least 50mm above the reference plane.
3.13 Skid block:
3.13.1
Beneath the surface formed by all parts lying on the reference plane, a rectangular skid block, with a 50mm radius (+/-2mm) on each front corner, must be fitted. This skid block may comprise more than one piece but must:
a) extend longitudinally from a point lying 330mm behind the front wheel centre line to the centre line of the rear wheels.
b) be made from an homogeneous material with a specific gravity between 1.3 and 1.45.
c) have a width of 300mm with a tolerance of +/- 2mm.
d) have a thickness of 10mm with a tolerance of +/- 1mm.
e) have a uniform thickness when new.
f) have no holes or cut outs other than those necessary to fit the fasteners permitted by 3.13.2 or those holes specifically mentioned in g) below.
g) have seven precisely placed holes the positions of which are detailed in Drawing 1. In order to establish the conformity of the skid block after use, its thickness will only be measured in the four 50mm diameter holes and the two forward 80mm diameter holes.
Four further 10 mm diameter holes are permitted provided their sole purpose is to allow access to the bolts which secure the Accident Data Recorder to the survival cell.
h) be fixed symmetrically about the centre line of the car in such a way that no air may pass between it and the surface formed by the parts lying on the reference plane.
3.13.2 Fasteners used to attach the skid block to the car must:
a) have a total area no greater than 40000mm² when viewed from directly beneath the car;
b) be no greater than 2000mm² in area individually when viewed from directly beneath the car;
c) be fitted in order that their entire lower surfaces are visible from directly beneath the car.
When the skid block is new, ten of the fasteners may be flush with its lower surface but the remainder may be no more than 8mm below the reference plane.
3.13.3 The lower edge of the periphery of the skid block may be chamfered at an angle of 30° to a depth of 8mm, the trailing edge however may be chamfered over a distance of 200mm to a depth of 8mm.
3.14 Overhangs:
3.14.1
No part of the car shall be more than 600mm behind the rear wheel centre line or more than 1200mm in front of the front wheel centre line.
3.14.2 No part of the bodywork more than 200mm from the car centre line may be more than 900mm in front of the front wheel centre line.
3.14.3 All overhang measurements will be taken parallel to the reference plane.
3.15 Aerodynamic influence:
With the exception of the cover described in Article 6.5.2 (when used in the pit lane) and the ducts described in Article 11.4, any specific part of the car influencing its aerodynamic performance:
- Must comply with the rules relating to bodywork.
- Must be rigidly secured to the entirely sprung part of the car (rigidly secured means not having any degree of freedom).
- Must remain immobile in relation to the sprung part of the car.
Any device or construction that is designed to bridge the gap between the sprung part of the car and the ground is prohibited under all circumstances.
No part having an aerodynamic influence and no part of the bodywork, with the exception of the skid block in 3.13 above, may under any circumstances be located below the reference plane.
3.16 Upper bodywork:
3.16.1
With the exception of the opening described in Article 3.16.3, when viewed from the side, the car must have bodywork in the area bounded by four lines. One vertical 1330 mm forward of the rear wheel centre line, one horizontal 550 mm above the reference plane, one horizontal 925 mm above the reference plane and one diagonal which intersects the 925 mm horizontal at a point 1000mm forward of the rear wheel centreline and the 550mm horizontal at the rear wheel centreline
Bodywork within this area must be arranged symmetrically about the car centre line and, when measured 200mm vertically below the diagonal boundary line, must have minimum widths of 150mm and 50mm respectively at points lying 1000mm forward of the rear wheel centre line and at the rear wheel centre line. This bodywork must lie on or outside the boundary defined by a linear taper between these minimum widths.
3.16.2 Bodywork lying vertically above the upper boundary as defined in 3.16.1 may be no wider than 125mm and must be arranged symmetrically about the car centreline.
3.16.3 In order that a car may be lifted quickly in the event of it stopping on the circuit, the principal rollover structure must incorporate a clearly visible unobstructed opening designed to permit a strap, whose section measures 60mm x 30mm, to pass through it.
3.17 Bodywork flexibility:
3.17.1
Bodywork may deflect no more than 5mm vertically when a 500N load is applied vertically to it 700mm forward of the front wheel centre line and 625mm from the car centre line. The load will be applied in a downward direction using a 50mm diameter ram and an adapter 300mm long and 150mm wide. Teams must supply the latter when such a test is deemed necessary.
3.17.2 Bodywork may deflect no more than 10mm vertically when a 500N load is applied vertically to it 450mm forward of the rear wheel centre line and 650mm from the car centre line. The load will be applied in a downward direction using a 50mm diameter ram and an adapter of the same size, Teams must supply the latter when such a test is deemed necessary.
3.17.3 Bodywork may deflect by no more than one degree horizontally when a load of 1000N is applied simultaneously to its extremities in a rearward direction 780mm above the reference plane and 2000mm forward of the rear wheel centre line.
3.17.4 Bodywork may deflect no more than 5mm vertically when a 2000N load is applied vertically to it at a point which lies on the car centre line and 380mm rearward of the front wheel centre line. The load will be applied in an upward direction using a 50mm diameter ram.
3.17.5 The uppermost aerofoil element lying behind the rear wheel centre line may deflect no more than 5mm horizontally when a 500N load is applied horizontally. The load will be applied 800mm above the reference plane at three separate points which lie on the car centre line and 250mm either side of it. The loads will be applied in a rearward direction using a suitable 25mm wide adapter which must be supplied by the relevant team.
3.17.6 The forward-most aerofoil element lying behind the rear wheel centre line and which lies more than 600mm above the reference plane may deflect no more than 2mm vertically when a 200N load is applied vertically. The load will be applied in line with the trailing edge of the element at any point across its width. The loads will be applied using a suitable adapter, supplied by the relevant team, which :
- may be no more than 50mm wide ;
- which extends no more than 10mm forward of the trailing edge ;
- incorporates an 8mm female thread in the underside.
3.17.7 Bodywork may deflect no more than 2mm vertically when a 500N load is applied simultaneously to each side of it 200mm behind the rear wheel centre line, 450mm from the car centre line and 820mm above the reference plane. The deflection will be measured at the outer extremities of the bodywork at a point 345mm behind the rear wheel centre line.
The load will be applied in a downward direction through pads measuring 200mm x 100mm which conform to the shape of the bodywork beneath them, and with their uppermost horizontal surface 820mm above the reference plane. The load will be applied to the centre of area of the pads. Teams must supply the latter when such a test is deemed necessary.
3.17.8 In order to ensure that the requirements of Article 3.15 are respected, the FIA reserves the right to introduce further load/deflection tests on any part of the bodywork which appears to be (or is suspected of), moving whilst the car is in motion.

Play video

SEARCH INSIDE F1