My Proposal – Technical Regulations – Chapter 14

ARTICLE 14: SAFETY EQUIPMENT

1. Fire Extinguishers
   All cars must be fitted with a fire extinguishing system which will discharge into the cockpit and into the engine compartment. The fire extinguishing system must be approved according to the “FIA Standard for Plumbed-in Fire Extinguisher Systems in Competition Cars”.
   The quantity of extinguishant may vary according to the type of extinguishant used.
   When operated, the fire extinguishing system must discharge 95% of its contents at a constant pressure in no less than 10 seconds and no more than 30 seconds.
   If more than one container with extinguishant is fitted, they must be released simultaneously.
   In the case of a pressurized system, each pressure vessel must be equipped with a means of checking whether the extinguisher is in an operable condition. Operable conditions are defined by the extinguisher manufacturer.
   The following information must be visible on each container with extinguishant: Type of extinguishant, Mass or volume of the extinguishant, Date the container must be checked which must be no more than two years after the date of filling.
   All parts of the extinguishing system must be situated within the survival cell and all extinguishing equipment must withstand fire.
   Any triggering system having its own source of energy is permitted, provided it is possible to operate all extinguishers should the main electrical circuits of the car fail. The driver must be able to trigger the extinguishing system manually when seated normally with his safety belts fastened and the steering wheel in place.
   Furthermore, a means of triggering from the outside must be combined with the circuit breaker switches described in other articles. They must be marked with a letter “E” in red at least 80mm tall, with a line thickness of at least 8mm, inside a white circle of at least 100mm diameter with a red edge with a line thickness of at least 4mm.
   The system must work in any position, even when the car is inverted.
   All extinguisher nozzles must be suitable for the extinguishant, included in the homologation of the fire extinguishing system, and be installed in such a way that they are not directly pointed at the driver.
   
2. Rear view mirrors
   All cars must have two mirrors positioned symmetrically about the car’s centre plane and mounted so that the driver has visibility to the rear and both sides of the car.
   Visibility should be wider than the rear wing and include cars that are beside up to the level of the rear wheel axis.
   The view from the mirrors shouldn’t be affected by any aerodynamic device on the side or the rear of the car, except the rear wing.
   
3. Rear lights
   All cars must have three rear lights in working order throughout the Competition which:
   1. Have to be functioning any time that the car is powered.
   2. Will have to be on in low visibility conditions.
      
4. Safety Tethers
   1. Wheel Tethers
      Each wheel must be fitted with three tethers, each with a cross sectional area greater than 110mm² and each of which comply with FIA standard 8864-2013 and each of which has a minimum energy absorption of 7kJ. No suspension member may contain more than two tethers.
      Each tether must have its own separate attachments at both ends, which:
      1. Are able to withstand a tensile force of 70kN in any direction within a cone of 45° (included angle) measured from the load line of the relevant suspension member.
      2. Are able to accommodate tether end fittings with a minimum inside diameter of 15mm.
      3. Do not share a common fastener and are designed such that the failure of one attachment point will not lead to the direct failure of an adjacent attachment point.
      4. Furthermore, at least two of the three tethers must have attachment points which:
         1. On the survival cell are separated from each other by at least 300mm in the X-direction, measured between their centres.
         2. On the gearbox are separated from each other by at least 250mm in the X-direction, measured between their centres.
         3. On each wheel/upright assembly are separated by at least 90° radially with respect to the rotational axis of the wheel and 100mm measured between the centres of the two attachment points.
      5. Each tether must exceed 450mm in length and must utilise end fittings which result in a tether bend radius greater than 7.5mm.
      6. Each team must supply detailed geometries which clearly show that all of the three tethers will independently prevent a wheel from making contact with a driver’s head during an accident, with the secondary roll structure fitted, assuming 40% elongation in each tether.
         
   2. Rear Wing Tethers
      The rear wing assembly must be fitted with two tethers. Each tether should have a cross sectional area of at least 7mm² and a minimum breaking strength of 5kN.
      The outer end of each tether should be attached to opposite sides of the rear wing assembly between 500mm and 600mm from the plane Y=0, between X_R=150 and X_R=400, and above Z=675. Each attachment must be able to withstand 5kN and the minimum bend-radius of the tether at the attachment is 3mm.
      The inboard end of each tether should be attached to the gearbox case ahead of X_DIF=300, or to the rear wing support bracket. with The attachments must be able to withstand 7.5kN if independent or 15kN if common. The minimum bend-radius of the tether at the attachment is 3mm. In the case of the tether attaching to the wing support bracket, teams must provide calculations demonstrating that the attachment point would remain connected to the gearbox if the wing assembly becomes detached.
      Alternatively, the two tethers may be joined to a single tether with a cross s sectional area of at least 14mm² and a minimum breaking strength of 10kN using a fitting able to withstand 15kN and with a minimum bend radius of the tethers of 3mm. The inboard end of this tether should be attached to the gearbox case ahead of XDIF=300, with attachments able to withstand 15kN and with a minimum bend radius of the tether of 3mm-
      
   3. Rear Impact Structure Tether
      The rear impact structure should be attached to the gearbox case with a tether with a cross sectional area of at least 20mm², a minimum breaking strength of 24kN and a length of at least 600mm. The attachment to the gearbox case should be ahead of X_DIF=300, should be able to accommodate the tether with a minimum bend radius of 6mm. This fixing should withstand a load of 20kN in a rearward direction at up to 22.5° from the X-axis. The attachment to the RIS should be behind X_DIF=650, should be able to accommodate the tether with a minimum bend radius of 6mm. This fixing should withstand a load of 20kN in a forward direction.