ARTICLE 9 : TRANSMISSION SYSTEM
9.1 Transmission types :
No transmission system may permit more than two wheels to be driven.
9.2 Clutch control :
All cars must be fitted with a means of disengaging the clutch for a minimum of fifteen minutes in the event
of the car coming to rest with the engine stopped. This system must be in working order throughout the
Event even if the main hydraulic, pneumatic or electrical systems on the car have failed.
In order that the driver or a marshal may activate the system in less than five seconds, the switch or button
which operates it must :
- face upwards and be positioned on the survival cell no more than 150mm from the car centre line ;
- be designed in order that a marshal is unable to accidentally re-engage the clutch ;
- be less than 150mm from the front of the cockpit opening ;
- be marked with a letter "N" in red inside a white circle of at least 50mm diameter with a red edge.
9.3 Gear ratios :
9.3.1 The minimum number of forward gear ratios is 4 and the maximum is 7.
9.3.2 Continuously variable transmission systems are not permitted.
9.4 Reverse gear :
All cars must have a reverse gear operable any time during the Event by the driver when the engine is
running.
9.5 Torque transfer systems :
9.5.1 Any system or device the design of which is capable of transferring or diverting torque from a slower to a
faster rotating wheel is not permitted.
9.5.2 Any device which is capable of transferring torque between the principal axes of rotation of the two front
wheels is prohibited.