Indoor On Road GT12
09-29-2014, 10:45 AM
#1
Indoor On Road GT12
Please be advised that this class is new @ MARCCA and is being treated as a demo class. It requires a specific (spec) chassis. The chassis allowed at this time are Mardave, Schumacher SupaStox and TIC Terminator. Said Chassis must cost under 100 Pounds British (About $149.00) It requires a 13.5 1S setup, no exceptions @ MARCCA.
As previously mentioned we are adopting the BRCA rules. Our club has decided right from the start to NOT allow 21.5 fixed timing motors.
The rule for club option state that any club can allow 21.5 FIXED TIMING motors. MARCCA will not be using this option as we are starting from scratch.
As a definintion: FIXED TIMING means the endbell cannot be manipulated to advance or retard timing. The majority of brushless motors on the market today offer timing adjustment and would not be legal in a fixed timing class.
BTW, ESC is $48, Battery is $27, 13.5 of your choice. Less expensive than same of 21.5 as the 2S battery will cost more. Some will have to learn to program their chargers for 1S.
As previously mentioned we are adopting the BRCA rules. Our club has decided right from the start to NOT allow 21.5 fixed timing motors.
The rule for club option state that any club can allow 21.5 FIXED TIMING motors. MARCCA will not be using this option as we are starting from scratch.
As a definintion: FIXED TIMING means the endbell cannot be manipulated to advance or retard timing. The majority of brushless motors on the market today offer timing adjustment and would not be legal in a fixed timing class.
BTW, ESC is $48, Battery is $27, 13.5 of your choice. Less expensive than same of 21.5 as the 2S battery will cost more. Some will have to learn to program their chargers for 1S.
Last edited by liljohn1064; 10-02-2014 at 08:56 AM.
09-29-2014, 11:02 AM
#2
GT12 Rules:
BRCA GT12 Circuit Rules 2014 – 2015
Version 1.3 – 01 June 2014
This class is 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.
The Rules outlined below may not necessarily cover every single aspect of car construction – drivers are
required to follow the spirit and intention of these rules if any ambiguity is discovered.
Construction Rules
1.1 The essence of the sport of Radio-controlled car racing is competition between realistic models of racing
automobiles. All cars must comply with dimensional requirements stated in these Rules.
All cars will use replica GT shells from the list of eligible shells given in Appendix 1
1.2 Minimum weight is 950 grams, ready to race including lap-counting transponder.
Wheels and tyres
1.3 Wheel rim diameter maximum is 40mm.
1.4 The tyres must be black except for side wall detail.
1.5 Tyre treatments are permitted at the organiser‟s discretion and are the user‟s responsibility. Organisers who ban
use of specific products should state on the entry forms. Flammable and toxic substances are not recommended.
The BRCA has not yet found a substance that it can recommend for the treatment/cleaning of tyres. The BRCA
draw organiser‟s attention to the possible hazard created by large numbers of competitors using tyre treatments in
a confined space.
The BRCA recommend that the competitor adheres to the methods of usage as stated by the supplier of the
treatment.
A list of additives will be published prior to start of each season. New additives may be added during the season,
subject to approval by the BRCA 12th section committee.
1.6 Tyres must have a minimum width of 20mm and a maximum width of 26mm. Only commercially available wheels
may be used. No modifications or changes to the original manufacturer‟s design and dimensions are allowed.
1.7 Wheel nuts and/or axles must not protrude more than 2.0mm beyond the outer edge of the wheels. No more than
1.5mm of wheel outer side may be exposed (not covered with rubber) on the outer edge of wheels.
Bodies, wings and bumpers
1.8 Bumpers may be fitted but must be designed to minimise injury that could result from being hit by a car, also to
reduce the risk of damage to other cars. Rigid bumpers made from non-resilient materials such as metal are not
allowed. Other sheet materials should have an edge radius not less than 1.5mm.
1.9 Only one wing is allowed on the car, maximum dimensions to be, width 165mm, chord 50mm, unless the original
car had more than one wing. The second wing must be to scale within 10% in size and location
1.10 Overall maximum width of the rolling chassis to be 165mm. Wheelbase is to be 196mm minimum to 208mm
maximum
1.11 All cars must have clear windscreens, unless the actual car did not have clear windscreens.
1.12 Side and/or rear windows, if any, must be clear.
1.13 A driver figure, if fitted, must be painted in realistic colour and garb.
1.14 All cars to have clearly visible identifying numbers to the Race Directors satisfaction.
1.15 Numbers must be at least 25mm high with minimum stroke of 4mm. They must be black numerals on a white
background.
1.16 No portion of the chassis or any equipment may extend beyond the body, except aerial masts, rear diffuser (if
fitted and in accordance with Rule 6.1.1.1) and up to four posts for the purpose of mounting the body shell.
1.17 Flexible masts/tubes only may be used.
1.18 Openings in the body or cockpit floor other than ones appropriate to full size cars shall be kept to a minimum.
1.19 Wheel cut-outs may not be more than 10mm larger than the tyre radius. Exception- scale size and/or shape wheel
well cut-outs. Wheel wells must be cut out if the original cars are cut out.
1.20 When initially entered in a meeting the body shell must be neatly finished and complete.
1.21 Body and chassis must be securely joined at all times while the car is on the track.
1.22 Body shells must be listed in Appendix 1 to these Rules to be eligible for use in BRCA GT12 Nationals.
Body shells must be approved by the Committee, a list of approved shells will be available on the BRCA website.
Body shells when painted will have a minimum of headlights, front grill and rear lights picked out in a realistic
colour, size and shape that clearly separate them from the other body colours. Additional grills and intakes picked out in the same way are preferred. Windows will be clear, may not be cut out, and will be shaped as per the
original car. Bodies must not be cut above the lower cut lines marked on the body shell.
1.23 Only one drive motor is allowed per car.
1.24 The minimum ground clearance of the car, not including the spur gear, is 3mm; minimum 1mm under the spur
gear; this will be checked after each qualifying heat and final race.
1.25 Only Personal Transponders will be used to record laps at BRCA sanctioned events and Nationals. The section
will have Personal Transponders available for competitors to purchase.
2 Definition of a Brushed motor
2.1 Motors allowed – Only the G2 2010 motor is allowed.
3 Definition of Brushless Motor
3.1 13.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (13.5)
as updated from time to time.
3.1.13.5.a Turnigy Trackstar motors with ROAR approval will be allowed to race.
3.2 17.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (17.5)
as updated from time to time.
4 Definition of a Zero-timing Speed Controller
4.1 Speed controllers may not be equipped with any form of automatic or programmable timing advance. If this feature
is available on the particular speed controller it must be disabled and placed in an approved mode - i.e. the
"ROAR blinking LEDs mode." Brushless Speed Controllers built without automatic or programmable timing
advance will be allowed. The BRCA 12th Committee will provide a list of eligible speed controllers. Details of the
requirement for the approved mode are contained in Appendix 2 – Zero-Timing Brushless Speed Controllers – and
this requirement must be met for a speed controller to be eligible for racing in relevant GT12 Classes.
4.1.1 MARCCA will allow the Trackstar Gen II ESC pending official approval from BRCA.
4.2 When using a sensorless speed controller/brushless motor combination Rule 4.1 does not apply.
4.3 Brushed Speed controllers are without restriction providing that they are available with a recommended retail price
not exceeding £65.
4.4 Reverse function must not be used in GT12-class cars at Nationals.
5 Batteries Allowed
5.1 Any cells conforming to the current Electric Board 1S Stick and Saddle LiPo battery list as updated from time to
time. All cells used in any competitions MUST be hard-cased. Soft cases or no cases are not allowed.
5.1.1 MARCCA will allow any 1S 3.7v hardcase battery with club approval
5.2 Cars with 13.5t or 17.5t Brushless Motors will be powered by cell/s with a maximum nominal voltage of 3.7v
5.3 Cars with G2 Brushed motors will be powered by cell/s with a maximum nominal voltage of 4.8v
6 Chassis and Components
6.1 The chassis component will consist of one continuous sheet of metal or glass- or carbon-fibre-reinforced plastic
(composite) that extends from a minimum 10mm ahead of the front axle line and runs continuously along the car
to end 25mm minimum behind the rear axle line. The chassis may not include any features designed to allow the
front and rear axle to rotate along the central axis of the car relative to each other. (Intent – that the chassis
supports all the suspension components and is sufficiently rigid not to be used as a working part of the suspension
system/s).
6.1.1 The material of the chassis component must be available from the manufacturer in a kit available at or below the
price limit in Rule 6.7. Only the chassis supplied in the kit may be used. Chassis from other kits, other
manufacturers, or made to other specifications are not allowed.
The chassis in the kit may only be modified to accept:
A different servo type or position by drilling and countersinking holes.
A different body post/s type or position by drilling and countersinking holes
A different aerial tube type or position by drilling and countersinking holes.
Smoothed edges and/or sealing with filler and/or adhesives.
The addition of bumpers to the front and/or rear of the car, or a rear diffuser conforming to Rule 6.1.1.1. This is
to be achieved by the drilling and countersinking holes only. To shorten the front or rear of the chassis for the
purpose of fitting a diffuser/bumper is NOT permitted (intent – that the outline silhouette of the chassis
component remains unchanged).
Battery location, orientation and restraining method may be changed (with the addition of up to 4 drilled and
countersunk holes in the chassis and/or 2 slots for tape) so long as the batteries are secure and no other
construction rules are broken
Any damage to the chassis as a result of use in racing is to be ignored under this rule.
6.1.1.1 A rear diffuser may be fitted in accordance with Rule 6.1.1. The width of the diffuser must be less than the
distance between the inner edges of the rear wheels. The trailing edge of the diffuser must lie below the rear axle
centerline and must not protrude more than 10mm beyond the most rearward point of the body shell (excluding
wings).
6.1.2 Metals used in the production rolling chassis and any aftermarket parts may only be brass, steel or aluminium with
the exception of the GT12 SuperCup class where, solely for the use as turnbuckles, titanium will be allowed. Brass and lead may be used as weights and when added/removed must not have any structural effect on the rolling
chassis.
6.2 All suspension systems must operate independently of the chassis component.
6.2.1 Separate dampers are only allowed on the rear suspension. Dampers requiring seals to prevent the egress of oil
are not allowed. (Intent – that dampers are non-sealed „straw‟ or „tube‟ style. Dampers with oil contained in a
sealed reservoir are not permitted).
6.3 Front suspension may be independent provided that the suspension design does not have any pivot, rod or other
mechanism that alters the wheel camber in roll relative to the chassis during its full travel. (Intent – that
suspension systems from Touring Cars, GT10 cars, 12th cars and F1 cars featuring pivoting suspension arms are
not used)
6.4 The rear axle must be a solid straight axle but it may be fitted with an integral differential.
6.5 Only a single fixed speed transmission is allowed.
6.6 Gears in the single fixed speed transmission must be 32DP or 48DP only.
6.7 Rolling chassis kits for the GT12 class may not have a recommended retail price higher than £99.95.
6.7.1 A rolling chassis kit must include one complete set of wheels and tires suitable for use on a carpet racing surface,
but does not have to include any electrics and/or body- shell.
6.8 Rolling element (ball) bearings are allowed on the front and rear axles.
6.9 Cars may only have two driven wheels with the drive to the rear axle.
End of Construction rules
7 Classes of Racing
7.1 GT12 SuperCup, using brushed or brushless motors (13.5t only) as defined in Construction Rules 2.1, 3.1, 4, 5.1
and 5.2. Cars may be fitted with additional parts not supplied in the rolling chassis kit (see Rule 6.7 and 6.7.1)
including a differential in the rear axle, replacements for other parts and home-made parts.
7.2 GT12 ProductionCup using brushed or brushless motors (17.5t only) as defined in Construction Rules 2.1, 3.2, 4,
5.1 and 5.2. Cars may be fitted with additional parts not supplied in the rolling chassis kit (see Rule 6.7 and 6.7.1)
including a differential in the rear axle and replacements for other parts.
Parts or components that break or wear out will be replaced “like for like”, or as close as possible if those parts
are no longer in production.
7.3 GT12 ProductionCup and SuperCup classes will only run in separate heats if there are more than 20 entries.
7.4 At BRCA Nationals a Team prize will be awarded. To enter, a Team must consist of:
Three drivers, each using the same paint scheme on their body shells. Entries may be in one GT12 class, or
across both GT12 classes at the same meeting.
Each driver will score one point for winning their final, up to ten points for finishing tenth. The team with the
lowest total score of all three drivers added together will win a prize on each day of the National.
The team‟s lowest scores from any four of the National events they enter in one season will be added together
to decide the Team Prize – one for each day of the National – presented at the EGM following that season.
Entry details will be given with the entry forms for each season of National events.
Track Design and Markings
Organisers will consult the BRCA 12th Section Track Design Guide and will wherever possible set out tracks that
follow those guidelines. In matters of safety, the BRCA Steward may request changes to the track layout and
markings before racing starts on the day of the BRCA Sanctioned event (National) in order to comply with the
Track Design Guide.
The following Appendices form part of the Rules above
Appendix 1 – Body Shells – (Construction) Rule 1.23
Only GT body shells are allowed. At the time of submission for homologation, the full sized car upon which the body shell
is based must have been raced in an FIA GT championship within the previous 3 years. All shells must be a reasonable
representation of the full sized car as judged by the 1/12 Section Committee. The final decisions on including bodies in
the approved list rests with the 1/12 Section Committee. Manufacturers are recommended to contact the 1/12 Section
GT12 Representative to confirm if any specific car is permitted. (Intent – that LMP cars and those designed specifically
for racing (eg Saleem) are not allowed).
As part of the homologation process, the manufacturer’s part number must be clearly marked in the lower corner of the
windscreen area.
The following is the list of approved bodies for the GT12 class:
Kamtec
Kamtec Lotus GT1 (Kamtec part no. GT01)
Kamtec Ascari GT3 (Kamtec part no. GT02)
Kamtec Aston Martin (Kamtec part no. GT03)
Kamtec Type F (Kamtec part no. GT04)
Mardave
Mardave Lotus GT1 (Mardave part no. V140)Mardave Ascari GT3 (Mardave part no. V151)
Mardave Aston Martin (Mardave part no. V160)
Mardave GT2 (Mardave part no. V131)
Mardave Porsche (Mardave part no. V113)
Mardave Ginetta (Mardave part no. V161)
Protoform
Protoform PF-M12 (Protoform part no. #1613-30)
Screwz4RC
Audi R8 (part number G903)
Appendix 2 – ‘Zero timing’ brushless speed controllers – (Construction) Rule 4
‘Zero timing’ brushless speed controllers
A speed controller that has a 'zero timing profile', that does not alter the fixed position pre-set mechanical timing of the
motor in any way and disables any advanced motor control; functions (ie. Boost, Cheat mode, Turbo etc.). This profile is
known as ' Boost 0'.
[Diagram to be added here in due course]
The commutation sequence is limited to "6-step" type and commutation of the Speed control must follow the motors
hall sensor signals 1:1. Therefore no change of timing (either advance or retard) is allowed at any RPM. When the
"Boost 0" profile is activated, it will be identified by a blinking LED or LEDs while the ESC is armed and in neutral
position.
The Section reserves the right to retain a speed controller and motor after the conclusion of a meeting to measure its
performance against the above criteria in a controlled environment. The equipment, or identical new replacements,
will be returned to the competitor within 5 working days. Sanctions may be taken against a competitor and/or
manufacturer if a controller is found to be non-compliant.
Apendices 3 and 4 are NOT Being used:
Appendix Three – Club Advice (2s LiPo / 21.5 motors)
It has been recognised that the lower voltages of 1s LiPo cells can provide complications when installing and running
certain combinations of electronics. To help alleviate this problem, a combination of a 2s LiPo battery pack and a 21.5t
motor can provide speed and power very similar to a 1s LiPo/13.5t combination and can be appropriate for club racing.
NOTE – this combination is not permitted at BRCA National events.
21.5t motors which have locked or fixed mechanical timing (ideally from the EB list) are suggested. For example:
HobbyWing / Xerun “Stock” 2.15t (part number 90040150/1)
SpeedPassion Ultra Sportsman V2 21.5t (Part Number SPF21V2)
SpeedPassion Ultra Sportsman V3 21.5t (Part Number SP00008)
Novak SS Pro 21.5t (Part Number 3421)
Losi Xcelron 21.5t (Part Number LOSB9409)
The Corally Pro Red motor is specifically excluded. If a model is chosen that does have a degree of mechanically
adjustable timing it is up to the driver to prove that the timing is set to its standard, factory setting.
(Intent – that 21.5t motors are not used with additional mechanical timing advanced as this will give a performance
advantage over the 13.5/1S combinations. It is intended that the use of 2S cells simplifies installation, and should not be
used to give a performance advantage.)
Appendix Four – Additional cells allowed for use with 21.5 motors
Micro off-road cells may include but are not limited to –
Intellect 1800/30C (Part Number CC2S1800)
MaxTraxx 2000 (O-MXX120)
Orion ORI14147
Venom VEN15023
SPC 2500/30C
ProTek PTK-LPH-1600-2S40
DuraTrax DTCX 1600 etc.
“Shorty” Cells may include but are not limited to
Ipower RLP4400R7-2S
Nosram SCH-NR99941
Reedy AS306
End of AppendicesV1.0 JG – Amended form EGM 2014 (21 May 2014)
V1.1 MS – Shell List Updated (21 May 2014)
V1.2 MS – Incorrect Blinky Diagram Removed (22 May 2014)
V1.3 JG – Audi Shell Added (01 June 2014)
BRCA GT12 Circuit Rules 2014 – 2015
Version 1.3 – 01 June 2014
This class is 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.
The Rules outlined below may not necessarily cover every single aspect of car construction – drivers are
required to follow the spirit and intention of these rules if any ambiguity is discovered.
Construction Rules
1.1 The essence of the sport of Radio-controlled car racing is competition between realistic models of racing
automobiles. All cars must comply with dimensional requirements stated in these Rules.
All cars will use replica GT shells from the list of eligible shells given in Appendix 1
1.2 Minimum weight is 950 grams, ready to race including lap-counting transponder.
Wheels and tyres
1.3 Wheel rim diameter maximum is 40mm.
1.4 The tyres must be black except for side wall detail.
1.5 Tyre treatments are permitted at the organiser‟s discretion and are the user‟s responsibility. Organisers who ban
use of specific products should state on the entry forms. Flammable and toxic substances are not recommended.
The BRCA has not yet found a substance that it can recommend for the treatment/cleaning of tyres. The BRCA
draw organiser‟s attention to the possible hazard created by large numbers of competitors using tyre treatments in
a confined space.
The BRCA recommend that the competitor adheres to the methods of usage as stated by the supplier of the
treatment.
A list of additives will be published prior to start of each season. New additives may be added during the season,
subject to approval by the BRCA 12th section committee.
1.6 Tyres must have a minimum width of 20mm and a maximum width of 26mm. Only commercially available wheels
may be used. No modifications or changes to the original manufacturer‟s design and dimensions are allowed.
1.7 Wheel nuts and/or axles must not protrude more than 2.0mm beyond the outer edge of the wheels. No more than
1.5mm of wheel outer side may be exposed (not covered with rubber) on the outer edge of wheels.
Bodies, wings and bumpers
1.8 Bumpers may be fitted but must be designed to minimise injury that could result from being hit by a car, also to
reduce the risk of damage to other cars. Rigid bumpers made from non-resilient materials such as metal are not
allowed. Other sheet materials should have an edge radius not less than 1.5mm.
1.9 Only one wing is allowed on the car, maximum dimensions to be, width 165mm, chord 50mm, unless the original
car had more than one wing. The second wing must be to scale within 10% in size and location
1.10 Overall maximum width of the rolling chassis to be 165mm. Wheelbase is to be 196mm minimum to 208mm
maximum
1.11 All cars must have clear windscreens, unless the actual car did not have clear windscreens.
1.12 Side and/or rear windows, if any, must be clear.
1.13 A driver figure, if fitted, must be painted in realistic colour and garb.
1.14 All cars to have clearly visible identifying numbers to the Race Directors satisfaction.
1.15 Numbers must be at least 25mm high with minimum stroke of 4mm. They must be black numerals on a white
background.
1.16 No portion of the chassis or any equipment may extend beyond the body, except aerial masts, rear diffuser (if
fitted and in accordance with Rule 6.1.1.1) and up to four posts for the purpose of mounting the body shell.
1.17 Flexible masts/tubes only may be used.
1.18 Openings in the body or cockpit floor other than ones appropriate to full size cars shall be kept to a minimum.
1.19 Wheel cut-outs may not be more than 10mm larger than the tyre radius. Exception- scale size and/or shape wheel
well cut-outs. Wheel wells must be cut out if the original cars are cut out.
1.20 When initially entered in a meeting the body shell must be neatly finished and complete.
1.21 Body and chassis must be securely joined at all times while the car is on the track.
1.22 Body shells must be listed in Appendix 1 to these Rules to be eligible for use in BRCA GT12 Nationals.
Body shells must be approved by the Committee, a list of approved shells will be available on the BRCA website.
Body shells when painted will have a minimum of headlights, front grill and rear lights picked out in a realistic
colour, size and shape that clearly separate them from the other body colours. Additional grills and intakes picked out in the same way are preferred. Windows will be clear, may not be cut out, and will be shaped as per the
original car. Bodies must not be cut above the lower cut lines marked on the body shell.
1.23 Only one drive motor is allowed per car.
1.24 The minimum ground clearance of the car, not including the spur gear, is 3mm; minimum 1mm under the spur
gear; this will be checked after each qualifying heat and final race.
1.25 Only Personal Transponders will be used to record laps at BRCA sanctioned events and Nationals. The section
will have Personal Transponders available for competitors to purchase.
2 Definition of a Brushed motor
2.1 Motors allowed – Only the G2 2010 motor is allowed.
3 Definition of Brushless Motor
3.1 13.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (13.5)
as updated from time to time.
3.1.13.5.a Turnigy Trackstar motors with ROAR approval will be allowed to race.
3.2 17.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (17.5)
as updated from time to time.
4 Definition of a Zero-timing Speed Controller
4.1 Speed controllers may not be equipped with any form of automatic or programmable timing advance. If this feature
is available on the particular speed controller it must be disabled and placed in an approved mode - i.e. the
"ROAR blinking LEDs mode." Brushless Speed Controllers built without automatic or programmable timing
advance will be allowed. The BRCA 12th Committee will provide a list of eligible speed controllers. Details of the
requirement for the approved mode are contained in Appendix 2 – Zero-Timing Brushless Speed Controllers – and
this requirement must be met for a speed controller to be eligible for racing in relevant GT12 Classes.
4.1.1 MARCCA will allow the Trackstar Gen II ESC pending official approval from BRCA.
4.2 When using a sensorless speed controller/brushless motor combination Rule 4.1 does not apply.
4.3 Brushed Speed controllers are without restriction providing that they are available with a recommended retail price
not exceeding £65.
4.4 Reverse function must not be used in GT12-class cars at Nationals.
5 Batteries Allowed
5.1 Any cells conforming to the current Electric Board 1S Stick and Saddle LiPo battery list as updated from time to
time. All cells used in any competitions MUST be hard-cased. Soft cases or no cases are not allowed.
5.1.1 MARCCA will allow any 1S 3.7v hardcase battery with club approval
5.2 Cars with 13.5t or 17.5t Brushless Motors will be powered by cell/s with a maximum nominal voltage of 3.7v
5.3 Cars with G2 Brushed motors will be powered by cell/s with a maximum nominal voltage of 4.8v
6 Chassis and Components
6.1 The chassis component will consist of one continuous sheet of metal or glass- or carbon-fibre-reinforced plastic
(composite) that extends from a minimum 10mm ahead of the front axle line and runs continuously along the car
to end 25mm minimum behind the rear axle line. The chassis may not include any features designed to allow the
front and rear axle to rotate along the central axis of the car relative to each other. (Intent – that the chassis
supports all the suspension components and is sufficiently rigid not to be used as a working part of the suspension
system/s).
6.1.1 The material of the chassis component must be available from the manufacturer in a kit available at or below the
price limit in Rule 6.7. Only the chassis supplied in the kit may be used. Chassis from other kits, other
manufacturers, or made to other specifications are not allowed.
The chassis in the kit may only be modified to accept:
A different servo type or position by drilling and countersinking holes.
A different body post/s type or position by drilling and countersinking holes
A different aerial tube type or position by drilling and countersinking holes.
Smoothed edges and/or sealing with filler and/or adhesives.
The addition of bumpers to the front and/or rear of the car, or a rear diffuser conforming to Rule 6.1.1.1. This is
to be achieved by the drilling and countersinking holes only. To shorten the front or rear of the chassis for the
purpose of fitting a diffuser/bumper is NOT permitted (intent – that the outline silhouette of the chassis
component remains unchanged).
Battery location, orientation and restraining method may be changed (with the addition of up to 4 drilled and
countersunk holes in the chassis and/or 2 slots for tape) so long as the batteries are secure and no other
construction rules are broken
Any damage to the chassis as a result of use in racing is to be ignored under this rule.
6.1.1.1 A rear diffuser may be fitted in accordance with Rule 6.1.1. The width of the diffuser must be less than the
distance between the inner edges of the rear wheels. The trailing edge of the diffuser must lie below the rear axle
centerline and must not protrude more than 10mm beyond the most rearward point of the body shell (excluding
wings).
6.1.2 Metals used in the production rolling chassis and any aftermarket parts may only be brass, steel or aluminium with
the exception of the GT12 SuperCup class where, solely for the use as turnbuckles, titanium will be allowed. Brass and lead may be used as weights and when added/removed must not have any structural effect on the rolling
chassis.
6.2 All suspension systems must operate independently of the chassis component.
6.2.1 Separate dampers are only allowed on the rear suspension. Dampers requiring seals to prevent the egress of oil
are not allowed. (Intent – that dampers are non-sealed „straw‟ or „tube‟ style. Dampers with oil contained in a
sealed reservoir are not permitted).
6.3 Front suspension may be independent provided that the suspension design does not have any pivot, rod or other
mechanism that alters the wheel camber in roll relative to the chassis during its full travel. (Intent – that
suspension systems from Touring Cars, GT10 cars, 12th cars and F1 cars featuring pivoting suspension arms are
not used)
6.4 The rear axle must be a solid straight axle but it may be fitted with an integral differential.
6.5 Only a single fixed speed transmission is allowed.
6.6 Gears in the single fixed speed transmission must be 32DP or 48DP only.
6.7 Rolling chassis kits for the GT12 class may not have a recommended retail price higher than £99.95.
6.7.1 A rolling chassis kit must include one complete set of wheels and tires suitable for use on a carpet racing surface,
but does not have to include any electrics and/or body- shell.
6.8 Rolling element (ball) bearings are allowed on the front and rear axles.
6.9 Cars may only have two driven wheels with the drive to the rear axle.
End of Construction rules
7 Classes of Racing
7.1 GT12 SuperCup, using brushed or brushless motors (13.5t only) as defined in Construction Rules 2.1, 3.1, 4, 5.1
and 5.2. Cars may be fitted with additional parts not supplied in the rolling chassis kit (see Rule 6.7 and 6.7.1)
including a differential in the rear axle, replacements for other parts and home-made parts.
7.2 GT12 ProductionCup using brushed or brushless motors (17.5t only) as defined in Construction Rules 2.1, 3.2, 4,
5.1 and 5.2. Cars may be fitted with additional parts not supplied in the rolling chassis kit (see Rule 6.7 and 6.7.1)
including a differential in the rear axle and replacements for other parts.
Parts or components that break or wear out will be replaced “like for like”, or as close as possible if those parts
are no longer in production.
7.3 GT12 ProductionCup and SuperCup classes will only run in separate heats if there are more than 20 entries.
7.4 At BRCA Nationals a Team prize will be awarded. To enter, a Team must consist of:
Three drivers, each using the same paint scheme on their body shells. Entries may be in one GT12 class, or
across both GT12 classes at the same meeting.
Each driver will score one point for winning their final, up to ten points for finishing tenth. The team with the
lowest total score of all three drivers added together will win a prize on each day of the National.
The team‟s lowest scores from any four of the National events they enter in one season will be added together
to decide the Team Prize – one for each day of the National – presented at the EGM following that season.
Entry details will be given with the entry forms for each season of National events.
Track Design and Markings
Organisers will consult the BRCA 12th Section Track Design Guide and will wherever possible set out tracks that
follow those guidelines. In matters of safety, the BRCA Steward may request changes to the track layout and
markings before racing starts on the day of the BRCA Sanctioned event (National) in order to comply with the
Track Design Guide.
The following Appendices form part of the Rules above
Appendix 1 – Body Shells – (Construction) Rule 1.23
Only GT body shells are allowed. At the time of submission for homologation, the full sized car upon which the body shell
is based must have been raced in an FIA GT championship within the previous 3 years. All shells must be a reasonable
representation of the full sized car as judged by the 1/12 Section Committee. The final decisions on including bodies in
the approved list rests with the 1/12 Section Committee. Manufacturers are recommended to contact the 1/12 Section
GT12 Representative to confirm if any specific car is permitted. (Intent – that LMP cars and those designed specifically
for racing (eg Saleem) are not allowed).
As part of the homologation process, the manufacturer’s part number must be clearly marked in the lower corner of the
windscreen area.
The following is the list of approved bodies for the GT12 class:
Kamtec
Kamtec Lotus GT1 (Kamtec part no. GT01)
Kamtec Ascari GT3 (Kamtec part no. GT02)
Kamtec Aston Martin (Kamtec part no. GT03)
Kamtec Type F (Kamtec part no. GT04)
Mardave
Mardave Lotus GT1 (Mardave part no. V140)Mardave Ascari GT3 (Mardave part no. V151)
Mardave Aston Martin (Mardave part no. V160)
Mardave GT2 (Mardave part no. V131)
Mardave Porsche (Mardave part no. V113)
Mardave Ginetta (Mardave part no. V161)
Protoform
Protoform PF-M12 (Protoform part no. #1613-30)
Screwz4RC
Audi R8 (part number G903)
Appendix 2 – ‘Zero timing’ brushless speed controllers – (Construction) Rule 4
‘Zero timing’ brushless speed controllers
A speed controller that has a 'zero timing profile', that does not alter the fixed position pre-set mechanical timing of the
motor in any way and disables any advanced motor control; functions (ie. Boost, Cheat mode, Turbo etc.). This profile is
known as ' Boost 0'.
[Diagram to be added here in due course]
The commutation sequence is limited to "6-step" type and commutation of the Speed control must follow the motors
hall sensor signals 1:1. Therefore no change of timing (either advance or retard) is allowed at any RPM. When the
"Boost 0" profile is activated, it will be identified by a blinking LED or LEDs while the ESC is armed and in neutral
position.
The Section reserves the right to retain a speed controller and motor after the conclusion of a meeting to measure its
performance against the above criteria in a controlled environment. The equipment, or identical new replacements,
will be returned to the competitor within 5 working days. Sanctions may be taken against a competitor and/or
manufacturer if a controller is found to be non-compliant.
Apendices 3 and 4 are NOT Being used:
Appendix Three – Club Advice (2s LiPo / 21.5 motors)
It has been recognised that the lower voltages of 1s LiPo cells can provide complications when installing and running
certain combinations of electronics. To help alleviate this problem, a combination of a 2s LiPo battery pack and a 21.5t
motor can provide speed and power very similar to a 1s LiPo/13.5t combination and can be appropriate for club racing.
NOTE – this combination is not permitted at BRCA National events.
21.5t motors which have locked or fixed mechanical timing (ideally from the EB list) are suggested. For example:
HobbyWing / Xerun “Stock” 2.15t (part number 90040150/1)
SpeedPassion Ultra Sportsman V2 21.5t (Part Number SPF21V2)
SpeedPassion Ultra Sportsman V3 21.5t (Part Number SP00008)
Novak SS Pro 21.5t (Part Number 3421)
Losi Xcelron 21.5t (Part Number LOSB9409)
The Corally Pro Red motor is specifically excluded. If a model is chosen that does have a degree of mechanically
adjustable timing it is up to the driver to prove that the timing is set to its standard, factory setting.
(Intent – that 21.5t motors are not used with additional mechanical timing advanced as this will give a performance
advantage over the 13.5/1S combinations. It is intended that the use of 2S cells simplifies installation, and should not be
used to give a performance advantage.)
Appendix Four – Additional cells allowed for use with 21.5 motors
Micro off-road cells may include but are not limited to –
Intellect 1800/30C (Part Number CC2S1800)
MaxTraxx 2000 (O-MXX120)
Orion ORI14147
Venom VEN15023
SPC 2500/30C
ProTek PTK-LPH-1600-2S40
DuraTrax DTCX 1600 etc.
“Shorty” Cells may include but are not limited to
Ipower RLP4400R7-2S
Nosram SCH-NR99941
Reedy AS306
End of AppendicesV1.0 JG – Amended form EGM 2014 (21 May 2014)
V1.1 MS – Shell List Updated (21 May 2014)
V1.2 MS – Incorrect Blinky Diagram Removed (22 May 2014)
V1.3 JG – Audi Shell Added (01 June 2014)
Last edited by liljohn1064; 10-08-2014 at 10:53 AM. Reason: ESC, Motor and Battery exceptions for MARCCA
09-29-2014, 02:11 PM
#3
10-02-2014, 08:33 AM
#6
Willoughby is all in and bought a car. He has memorized the rules. He is the shell enforcer. He will be checking shells for headlights, tail lights, blacked out windscreens (windows and the like), cut lines and general good repair. He has also stated that the rules specifically state that if you have a driver, the driver must be a proper driver figure and not a Barbie head or screaming glow in the dark skull. Well the part about the Barbie head and screaming skull is implied in the rules.... 
10-02-2014, 03:40 PM
#7
10-02-2014, 08:56 PM
#8
something something Roadkill?
10-03-2014, 12:38 PM
#10
Tech Apprentice
Correct me if i am missing something john but wouldn't it be much cheaper to go with 21.5 and a 2 cell? Everybody has a 2s shorty pack and a 2s esc so all they would need is a 21.5 fixed timing motor. This new cheap class is sounding not so cheap?
10-03-2014, 01:15 PM
#11
Tech Apprentice
Ok just saw the 2s pack required is a saddlepack! So really its not much different other than you have to get a new speedo! Also will this class last for more than one season??
10-05-2014, 03:18 PM
#12
GT12 is 1S 13.5. If the class lasts is up to us sticking to the rules and keeping the racing fun and the cars competitive. This class because of its rules will probably become the biggest class for onroad. Door to door racing for 8 minutes is just enticing. The argument of having to buy all new gear is really not valid. Most guys will buy new just to have the best. When you can get a 1S battery, ESC and motor for $110 that is competitive I'd save my pennies for that setup.
Last edited by liljohn1064; 10-05-2014 at 07:13 PM.
10-08-2014, 08:11 AM
#14
GT12 Equipment List
Some have said it might be useful to have a reasonable list of items to purchase should you choose to race our GT12 class.
I'll update this as I can with what I believe to be required items to race competitively and those things that are creature comforts, but with no real performance advantage.
Required Items:
Schumacher SupaStox - 4 cell - 1S - Shorty #K131
Schumacher SupaStox - Diff Assembled 70T - 48DP #U4115
Schumacher - Ball Bearing 4x8x3mm Red Sealed you need (2) pair #U3075 Any 4x8x3mm bearings will do.
Nice to have:
Schumacher SupaStox - Lipo Strap + Posts #U4363
Schumacher SupaStox - Alloy Spring Hanger #U4402
I'll update this as I can with what I believe to be required items to race competitively and those things that are creature comforts, but with no real performance advantage.
Required Items:
Schumacher SupaStox - 4 cell - 1S - Shorty #K131
Schumacher SupaStox - Diff Assembled 70T - 48DP #U4115
Schumacher - Ball Bearing 4x8x3mm Red Sealed you need (2) pair #U3075 Any 4x8x3mm bearings will do.
Nice to have:
Schumacher SupaStox - Lipo Strap + Posts #U4363
Schumacher SupaStox - Alloy Spring Hanger #U4402
Last edited by celt; 10-08-2014 at 04:34 PM.
10-08-2014, 08:54 AM
#15
I'm still working on putting together equipment for GT12. Are we trying to stick with the BRCA approval lists for motor, battery, esc? I thought we were but the Trackstar Gen2 is not BRCA approved... frustrating...
3.1 13.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (13.5)
as updated from time to time.
http://www.brca.org/sites/www.brca.o...20v7%20pdf.pdf
4 Definition of a Zero-timing Speed Controller
4.1 Speed controllers may not be equipped with any form of automatic or programmable timing advance. If this feature
is available on the particular speed controller it must be disabled and placed in an approved mode - i.e. the
"ROAR blinking LEDs mode." Brushless Speed Controllers built without automatic or programmable timing
advance will be allowed. The BRCA 12th Committee will provide a list of eligible speed controllers. Details of the
requirement for the approved mode are contained in Appendix 2 – Zero-Timing Brushless Speed Controllers – and
this requirement must be met for a speed controller to be eligible for racing in relevant GT12 Classes.
4.2 When using a sensorless speed controller/brushless motor combination Rule 4.1 does not apply.
http://www.brca.org/sites/www.brca.o...%202014-15.pdf
5.1 Any cells conforming to the current Electric Board 1S Stick and Saddle LiPo battery list as updated from time to
time. All cells used in any competitions MUST be hard-cased. Soft cases or no cases are not allowed.
http://www.brca.org/sites/www.brca.o...14%29%20v4.pdf
3.1 13.5 brushless - Any motor listed in any of the Electric Board Homologation List for Brushless Spec Motors (13.5)
as updated from time to time.
http://www.brca.org/sites/www.brca.o...20v7%20pdf.pdf
4 Definition of a Zero-timing Speed Controller
4.1 Speed controllers may not be equipped with any form of automatic or programmable timing advance. If this feature
is available on the particular speed controller it must be disabled and placed in an approved mode - i.e. the
"ROAR blinking LEDs mode." Brushless Speed Controllers built without automatic or programmable timing
advance will be allowed. The BRCA 12th Committee will provide a list of eligible speed controllers. Details of the
requirement for the approved mode are contained in Appendix 2 – Zero-Timing Brushless Speed Controllers – and
this requirement must be met for a speed controller to be eligible for racing in relevant GT12 Classes.
4.2 When using a sensorless speed controller/brushless motor combination Rule 4.1 does not apply.
http://www.brca.org/sites/www.brca.o...%202014-15.pdf
5.1 Any cells conforming to the current Electric Board 1S Stick and Saddle LiPo battery list as updated from time to
time. All cells used in any competitions MUST be hard-cased. Soft cases or no cases are not allowed.
http://www.brca.org/sites/www.brca.o...14%29%20v4.pdf
Last edited by OrganicMechanic; 10-08-2014 at 09:07 AM.