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Bodywork and dimensions

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

ARTICLE 3 : BODYWORK AND DIMENSIONS
One of the purposes of the regulations under Article 3 below is to minimize the detrimental effect that the wake of a car may have on a following car.
Furthermore, infinite precision can be assumed on certain dimensions provided it is clear that such an assumption is not being made in order to circumvent or subvert the intention of the relevant regulation.
For illustrations refer to drawings 1A-17A in the Appendix to the Technical Regulations.
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, excluding tyres, must not exceed 1800mm with the steered wheels in the straight ahead position.
3.4 Width ahead of the rear wheel centre line :
3.4.1
Bodywork width between the front and the rear wheel centre lines must not exceed 1400mm.
Bodywork width ahead of the front wheel centre line must not exceed 1650mm.
3.4.2 In order to prevent tyre damage to other cars, any bodywork outboard of the most inboard part of the bodywork used to define the area required by Article 3.7.5, and which is more than 450mm ahead of the front wheel centre line, must be at least 10mm thick (being the minimum distance when measured normal to the surface in any direction) with a 5mm radius applied to all extremities.
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 satisfied that all such parts are constructed in order to achieve the stated objective.
3.5 Width behind the rear wheel centre line :
3.5.1
The width of bodywork behind the rear wheel centre line and less than 150mm above the reference plane must not exceed 1000mm.
3.5.2 The width of bodywork behind the rear wheel centre line and more than 150mm above the reference plane must not exceed 750mm.
3.6 Overall height :
No part of the bodywork may be more than 950mm above the reference plane.
3.7 Front bodywork :
3.7.1
All bodywork situated forward of a point lying 330mm behind the front wheel centre line, and more than 250mm from the car centre line, must be no less than 75mm and no more than 275mm above the reference plane.
3.7.2 Any horizontal section taken through bodywork located forward of a point lying 450mm forward of the front wheel centre line, less than 250mm from the car centre line, and between 125mm and 135mm above the reference plane, may only contain two closed symmetrical sections with a maximum total area of 5000mm2. The thickness of each section may not exceed 25mm when measured perpendicular to the car centre line.
Once fully defined, the sections at 125mm above the reference plane must be projected vertically to join the profile required by Article 3.7.3. A radius no greater than 10mm may be used where these sections join.
3.7.3 Forward of a point lying 450mm ahead of the front wheel centre line and less than 250mm from the car centre line and less than 125mm above the reference plane, only one single section may be contained within any longitudinal vertical cross section parallel to the car centre line.
Furthermore, with the exception of local changes of section where the bodywork defined in Article 3.7.2 attaches to this section, the profile, incidence and position of this section must conform to drawing 7. This section may not contain any closed channel the effect of which is to duct air directly or indirectly to or from the external air stream for any purpose other than data acquisition.
3.7.4 In the area bounded by lines between 450mm and 1000mm ahead of the front wheel centre line, 250mm and 400mm from the car centre line and between 75mm and 275mm above the reference plane, the projected area of all bodywork onto the longitudinal centre plane of the car must be no more than 20,000mm2.
3.7.5 Ahead of the front wheel centre line and between 685mm and 775mm from the car centre line there must be bodywork with a projected area of no less than 95,000mm2 in side view.
3.7.6 Ahead of the front wheel centre line and between 775mm and 825mm from the car centre line there must be bodywork with a projected area of no less than 23,000mm2 in plan view. Furthermore, when viewed from underneath, the bodywork in this area must form one continuous surface which may not be more than 100mm above the reference plane.
3.7.7 Any longitudinal vertical cross section taken through bodywork ahead of the front wheel centre line and between 775mm and 825mm from the car centre line must contain an area no greater than 15,000mm2.
3.7.8 Only a single section, which must be open, may be contained within any longitudinal vertical cross section taken parallel to the car centre line forward of a point 150mm ahead of the front wheel centre line, less than 250mm from the car centre line and more than 125mm above the reference plane.
Any cameras or camera housings approved by the FIA in addition to a single inlet aperture for the purpose of driver cooling (such aperture having a maximum projected surface area of 1500mm2 and being situated forward of the section referred to in Article 15.4.3) will be exempt from the above.
3.7.9 No bodywork situated forward of the line A-A referred to Drawing 5 may extend above a diagonal line from a point on A-A and 625mm above the reference plane to a point 50mm rearward of the forward-most point of the impact absorbing structure defined in Article 15.4.3 and 300mm above the reference plane. No bodywork situated forward of the forward-most point of this diagonal line may be more than 300mm above the reference plane.
With the exception of a transparent windscreen, antenna or pitot tubes, no bodywork situated between the line A-A referred to in Drawing 5 and the secondary roll structure may lie more than 625mm above the reference plane.
Any bodywork situated above the impact absorbing structure defined by Article 15.4.3 or above the survival cell, and forward of the line B-B, must be of prescribed laminate, details of this laminate may be found in the Appendix to the Technical Regulations.
3.8 Bodywork in front of the rear wheels :
3.8.1
Other than the rear view mirrors (including their mountings), each with a maximum area of 12000mm² and 14000 mm2 when viewed from directly above or directly from the side respectively, 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 car centre line.
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 375mm from the car centre line, 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 375mm from the car centre line, may be more than 300mm above the reference plane.
3.8.4 Any vertical cross section of bodywork normal to the car centre line situated in the volumes defined below must form one tangent continuous curve on its external surface. This tangent continuous curve may not contain any radius less than 75mm :
a) The volume between 50mm forward of the rear wheel centre line and 300mm rearward of the rear face of the cockpit entry template, which is more than 25mm from the car centre line and more than 100mm above the reference plane.
b) The volume between 300mm rearward of the rear face of the cockpit entry template and the rear face of the cockpit entry template, which is more than 125mm from the car centre line and more than 100mm above the reference plane.
c) The volume between the rear face of the cockpit entry template and 450mm forward of the rear face of the cockpit entry template, which is more than 350mm from the car centre line and more than 100mm above the reference plane.
d) The volume between the rear face of the cockpit entry template and 450mm forward of the rear face of the cockpit entry template, which is more than 125mm from the car centre line and more than 675mm above the reference plane.
The surfaces lying within these volumes, which are situated more than 55mm forward of the rear wheel centre line, must not contain any apertures (other than those permitted by Article 3.8.5) or contain any vertical surfaces which lie normal to the car centre line.
3.8.5 Once the relevant bodywork surfaces are defined in accordance with Article 3.8.4, apertures, any of which may adjoin or overlap each other, may be added for the purpose of allowing suspension members and driveshafts to protrude through the bodywork. Only one aperture may be added for each suspension member and no such aperture may have an area greater than 12,000 mm2 when projected onto the surface itself. No point on an aperture may be more than 200mm from any other point on the aperture.
3.8.6 The impact absorbing structures defined by Article 15.5.2 must be fully enclosed by bodywork, such that no part of the impact structure is in contact with the external air flow. When cut by a longitudinal vertical plane, the bodywork enclosing these impact structures must not form closed sections in the region between 450mm and 875mm forward of the rear edge of the cockpit template.
3.9 Bodywork between the rear wheels :
3.9.1
No bodywork situated between 50mm and 330mm forward of the rear wheel centre line may be more than 730mm above the reference plane.
3.9.2 There must be no bodywork behind a line 30mm forward of the rear wheel centre line which lies between 100mm and 355mm from the car centre line and between 150mm and750mm above the reference plane.
3.9.3 No bodywork situated between 50mm and 30mm forward of the rear wheel centre line, and which is between 100mm and 355mm from the car centre line, may be located between 550mm and 750mm above the reference plane.
3.10 Bodywork behind the rear wheel centre line :
3.10.1
Other than the bodywork defined in Article 3.10.8, any bodywork behind a point lying 50mm forward of the rear wheel centre line which is more than 750mm above the reference plane, and less than 355mm 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.
With the exception of minimal parts solely associated with adjustment of the section in accordance with Article 3.18 :
a) When viewed from the side of the car, no longitudinal vertical cross section may have more than two sections in this area, each of which must be closed.
b) No part of these longitudinal vertical cross sections in contact with the external air stream may have a local concave radius of curvature smaller than 100mm.
Once the rearmost and uppermost section is defined, 'gurney' type trim tabs may be fitted to the trailing edge. When measured in any longitudinal vertical cross section no dimension of any such trim tab may exceed 20mm.
The chord of the rearmost and uppermost closed section must always be smaller than the chord of the lowermost section at the same lateral station.
Furthermore, the distance between adjacent sections at any longitudinal vertical plane must lie between 10mm and 15mm at their closest position, except, in accordance with Article 3.18, when this distance must lie between 10mm and 65mm.
3.10.2 In order to ensure that the individual profiles and the relationship between these two sections can only change whilst the car is in motion in accordance with Article 3.18, they must be bridged by means of pairs of rigid impervious supports arranged such that no part of the trailing edge of the forward section may be more than 200mm laterally from a pair of supports. These pairs of supports must :
a) Be located no more than 355mm from the car centre line.
b) Fully enclose each complete section such that their inner profiles match that of each section. With the exception of minimal local changes where the two sections are adjacent to each other, their outer profiles must be offset from the inner profiles by between 8mm and 30mm and may not incorporate any radius smaller than 10mm ('gurney' type trim tabs may however be fitted between the supports).
c) Be aligned as a pair so as to provide a bearing across their full thickness and along a profile length of at least 10mm when the distance between the two sections is at its closest position.
d) Not be recessed into the wing profiles (where a recess is defined as a reduction in section at a rate greater than 45° with respect to a lateral axis).
e) Be arranged so that any curvature occurs only in a horizontal plane (other than when this bodywork is adjusted in accordance with Article 3.18).
f) Be between 2mm and 5mm thick.
g) Be rigidly fixed to their respective sections.
h) 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 3.6, 3.9.2, 3.10.1, 3.10.3 and 3.10.5.
3.10.3 No part of the car between 75mm and 355mm from the car centre line may be more than 350mm behind the rear wheel centre line.
3.10.4 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.
3.10.5 No part of the car less than 75mm from the car centre line and more than 350mm behind the rear wheel centre line may be more than 400mm above the reference plane.
3.10.6 No part of the car more than 375mm from the car centre line may be more than 350mm behind the rear wheel centre line.
3.10.7 In side view, the projected area of any bodywork lying between 300mm and 950mm above the reference plane and between the rear wheel centre line and a point 600mm behind it and more than 355mm from the car centre line must be greater than 330000mm². 3.10.8 Any horizontal section between 600mm and 750mm above the reference plane, taken through bodywork located rearward of a point lying 50mm forward of the rear wheel centre line and less than 75mm from the car centre line, may contain no more than two closed symmetrical sections with a maximum total area of 5000mm2. The thickness of each section may not exceed 25mm when measured perpendicular to the car centre line.
Once fully defined, the section at 745mm above the reference plane may be extruded upwards to join the sections defined in Article 3.10.1. A fillet radius no greater than 10mm may be used where these sections join.
3.11 Bodywork around the front wheels :
3.11.1
With the exception of the air ducts described in Article 11.4 and the mirrors described in Article 3.8.1, in plan view, there must be no bodywork in the area formed by the intersection of the following lines :
a) A longitudinal line parallel to and 900mm from the car centre line.
b) A transverse line 450mm forward of the front wheel centre line.
c) A diagonal line from 450mm forward of the front wheel centre line and 400mm from the car centre line to 750mm forward of the front wheel centre line and 250mm from the car centre line.
d) A transverse line 750mm forward of the front wheel centre line.
e) A longitudinal line parallel to and 165mm from the car centre line.
f) A diagonal line running forwards and inwards, from a point 875mm forward of the rear face of the cockpit entry template and 240mm from the car centre line, at an angle of 4.5° to the car centre line.
g) A diagonal line from 875mm forward of the rear face of the cockpit entry template and 240mm from the car centre line to 625mm forward of the rear face of the cockpit entry template and 415mm from the car centre line.
h) A transverse line 625mm forward of the rear face of the cockpit entry template.
For reference this area is shown in Drawing 17A in the Appendix to the Technical Regulations.
3.11.2 With the exception of the air ducts described in Article 11.4, in side view, there must be no bodywork in the area formed by two vertical lines, one 325mm behind the front wheel centre line, one 450mm ahead of the front wheel centre line, one diagonal line intersecting the vertical lines at 100mm and 135mm above the reference plane respectively, and one horizontal line on the reference plane.
3.12 Bodywork facing the ground :
3.12.1
With the skid block referred to in Article 3.13 removed all sprung parts of the car situated from 330mm behind the front wheel centre line to 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 and 15.4.8.
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 :
a) Cover the area which is bounded by two transversal lines, one 330mm behind the front wheel centre line and the other on the rear wheel centre line, and two longitudinal lines 150mm either side of the car centre line.
b) Have a maximum width of 500mm.
c) Be symmetrical about the car centre line.
d) 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 boundaries of the surface lying on the reference plane and the point at which the vertical transitions meet the surfaces on the step plane may incorporate a radius no greater than 25mm.
A radius in this context will be considered as an arc of constant curvature applied perpendicular to the boundary and tangential to both surfaces.
The boundaries of the surfaces lying on the step plane which do not meet one of the vertical transitions may be curved upwards with a radius no greater than 50mm which must be of constant curvature.
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 (no fully enclosed holes), rigid (no degree of freedom in relation to the body/chassis unit), impervious surfaces under all circumstances.
Fully enclosed holes are only permitted in the surfaces lying on the reference and step planes forward of a line 450mm forward of the rear face of the cockpit entry template, provided no part of the car is visible through them when viewed from directly below. 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 and 15.4.8.
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 +/- 3mm is permissible across the surfaces lying on the reference and step planes and a horizontal tolerance of 3mm is permitted when assessing whether a surface is visible from beneath the car.
3.12.7 No bodywork which is visible from beneath the car and which lies between the rear wheel centre line and a point 350mm rearward 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 (no fully enclosed holes), 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 the rear wheel centre line, which are visible from underneath and are more than 250mm from the car centre line, must be at least 50mm above the reference plane.
3.12.9 In an area lying 450mm or less from the car centre line, and from 450mm forward of the rear face of the cockpit entry template to 350mm rearward of the rear wheel centre line, any intersection of any bodywork visible from beneath the car with a lateral or longitudinal vertical plane should form one continuous line which is visible from beneath the car.
3.12.10 In an area lying 650mm or less from the car centre line, and from 450mm forward of the rear face of the cockpit entry template to 350mm forward of the rear wheel centre line, any intersection of any bodywork visible from beneath the car with a lateral or longitudinal vertical plane should form one continuous line which is visible from beneath the car.
3.12.11 Compliance with Article 3.12 must be demonstrated with the panels referred to in Articles 15.4.7 and 15.4.8 and all unsprung parts of the car removed.
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 no more than three pieces, the forward one of which may not be any less than 1000mm in length, but must :
a) Extend longitudinally from a point lying 330mm behind the front wheel centre line to the rear wheel centre line.
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 10mm 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 car centre line 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 may 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 1000mm 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 driver adjustable bodywork described in Article 3.18 (in addition to minimal parts solely associated with its actuation) and the ducts described in Article 11.4, any specific part of the car influencing its aerodynamic performance :
a) Must comply with the rules relating to bodywork.
b) Must be rigidly secured to the entirely sprung part of the car (rigidly secured means not having any degree of freedom).
c) 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.
With the exception of the parts necessary for the adjustment described in Article 3.18, any car system, device or procedure which uses driver movement as a means of altering the aerodynamic characteristics of the car is prohibited.
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 1330mm forward of the rear wheel centre line, one horizontal 550mm above the reference plane, one horizontal 925mm above the reference plane and one diagonal which intersects the 925mm horizontal at a point 1000mm forward of the rear wheel centre line and the 550mm horizontal at a point lying 50mm forward of the rear wheel centre line.
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 and 50mm forward of 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 centre line.
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 10mm vertically when a 1000N load is applied vertically to it at points 675mm and 975mm forward of the front wheel centre line and 720mm from the car centre line. The load will be applied in a downward direction using a 50mm diameter ram on a rectangular adapter measuring 400mm x 150mm. This adapter must be supplied by the team and :
a) Have a flat top surface without recesses.
b) Be fitted to the car so as to apply the full load to the bodywork at the test point and not to increase the rigidity of the parts being tested.
c) Be placed with the inner 400mm edge parallel to the car centre line and displaced from it by 645mm.
d) Be placed with its forward edge 1025mm forward of the front wheel centre line.
The deflection will be measured along the loading axis at the bottom of the bodywork at this point and relative to the reference plane.
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 925mm above the reference plane and 20mm forward of the forward edge of the rear wing endplate.
3.17.4 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, 325mm from the car centre line and 970mm 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 970mm 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.
3.17.5 Bodywork may deflect no more than 5mm vertically when a 2000N load is applied vertically to it at three different points which lie on the car centre line and 100mm either side of it. Each of these loads will be applied in an upward direction at a point 380mm rearward of the front wheel centre line using a 50mm diameter ram in the two outer locations and a 70mm diameter ram on the car centre line.
Stays or structures between the front of the bodywork lying on the reference plane and the survival cell may be present for this test, provided they are completely rigid and have no system or mechanism which allows non-linear deflection during any part of the test.
Furthermore, the bodywork being tested in this area may not include any component which is capable of allowing more than the permitted amount of deflection under the test load (including any linear deflection above the test load), such components could include, but are not limited to :
a) Joints, bearings pivots or any other form of articulation.
b) Dampers, hydraulics or any form of time dependent component or structure.
c) Buckling members or any component or design which may have any non-linear characteristics.
d) Any parts which may systematically or routinely exhibit permanent deformation.
3.17.6 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 950mm above the reference plane at three separate points which lie on the car centre line and 190mm 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.
3.17.7 The forward-most aerofoil element lying behind the rear wheel centre line and which lies more than 730mm 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 :
a) May be no more than 50mm wide.
b) Which extends no more than 10mm forward of the trailing edge.
c) Incorporates an 8mm female thread in the underside.
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.
3.18 Driver adjustable bodywork :
3.18.1
The incidence of the rearmost and uppermost closed section described in Article 3.10.2 may be varied whilst the car is in motion provided :
a) It comprises only one component that must be symmetrically arranged about the car centre line with a minimum width of 708mm.
b) With the exception of minimal parts solely associated with adjustment of the section, no parts of the section in contact with the external airstream may be located any more than 355mm from the car centre line.
c) With the exception of any minimal parts solely associated with adjustment of the rearmost and uppermost section, two closed sections are used in the area described in Article 3.10.1.
d) Any such variation of incidence maintains compliance with all of the bodywork regulations.
e) It cannot be used to change the geometry of any duct, either directly or indirectly, other than the change to the distance between adjacent sections permitted by Article 3.10.1.
f) When viewed from the side of the car at any longitudinal vertical cross section, the physical point of rotation of the rearmost and uppermost closed section must be fixed and located no more than 20mm below the upper extremity and no more than 20mm forward of the rear extremity of the area described in Article 3.10.1 at all times.
g) The design is such that failure of the system will result in the uppermost closed section returning to the normal high incidence position.
h) Any alteration of the incidence of the uppermost closed section may only be commanded by direct driver input and controlled using the control electronics specified in Article 8.2.