Construction Rules

The GT12 construction rules are based on the principals of close, fair and low cost racing. This will make it both an ideal entry level class for the driver who wishes to try his or her hand at RC racing for the first time, but the rules for the class will also cater for the more competent driver who wishes to take their racing further.

In the interests of keeping racing costs reasonable, price limits have been placed on certain items and there is strict guidance as to the use of additional upgrade parts and components. This should also ensure that the performance of each car is more dependent on driver ability and good setup than on budget.
Our GT12 construction rules

  • Cars to race will any commercially available chassis that complies to the BRCA regulations for the GT12 class
  • No vehicle shall be constructed so as to be dangerous to persons or cause damage to competitors cars or to the track surface, no sharp or protruding objects are allowed on the cars
  • Body and chassis must be securely joined at the start of race and must remain on car during the race
  • Steel whip aerials are not allowed, plastic whip aerials are allowed
  • Minimum ride height (including the bodyshell) will be 3mm (we would recommend for Mardave chassis’ that you have the holes in your chassis countersunk and then use countersunk screws – the Club will help out if you require your chassis to be countersunk) and 1mm at the spur gear
  • Minimum weight is 950 grams, ready to race including transponder
  • Only foam tyres allowed, tyres to be Min 20mm Max 26mm width and have a Max 60mm diameter, no minimum diameter for tyres, but the tyre must cover the wheel
  • Tyre additive allowed (see additive list) and tyres must be dry before the car is placed onto the carpet to race
  • Ball races allowed on both front and rear axles
  • Either 32 or 48 dp pinion and spur gear to be used
  • Differentials allowed
  • Alloy motor pods may be used
  • Front wishbone braces are permitted
  • Any make of servo, servo saver or track rod ends can be used on the cars steering system
  • No external bumpers are permitted – however, a commercially available internal front and rear foam bumper maybe used
  • Any commercially available body shells may be used, the shell must remain securely fixed to the car throughout the race
  • No supplementary aerofoil or fins shall be fitted to the body with the exception of a rear wing if desirable, this wing must be non-metallic, commercially available and securely fixed
  • All LiPo cells used MUST be hard-cased, soft cases not permitted
  • Cars powered by LiPo will have a maximum nominal voltage of 3.7v
  • Cars powered by NiMH cells will have a maximum nominal voltage of 4.8v
  • Any commercially available 13.5 Brushless motor that is on the BRCA approved list maybe used
  • Forward only speed controllers allowed, if reverse is available this must either be disabled or not used during a race
  • Brushless ESC with turbo or timing adjustments MUST have these features turned off and raced in ‘Blinky’ mode
  • Any commercially available Electronic Speed Controller that is on the BRCA approved list maybe used
  • Motor heat sinks with or without fans are permitted to cool the motor
  • Although comm drops are permitted to be used on your motor, other motor prep techniques such as water dipping are not permitted
  • The club recommend that all beginners and F4 drivers use a 17.5 Brushless motors. Although this rule will not be currently enforced, it is highly recommended to help keep the speed of the cars at a more manageable level
  • If beginners or F4 drivers use a 13.5 Brushless motor, the speed MUST be controlled by setting their throttle to a maximum of 80% – either via the EPA settings on the transmitter or via the ESC throttle settings
  • All F4 drivers must set their brushless motor timing to zero.