View Full Version : 2011 ISRA/USA North American Scale Championships Rulebook - Part 1

Casey Scott
06-13-2011, 09:46 AM
2011 ISRA USA North American Championships Rulebook - Part 1


Unsportsmanlike conduct will not be tolerated. Unsportsmanlike conduct is grounds for disqualification.
There must be only 1 driver per car and only 1 car per driver.
Any damage that would make the car illegal, such as the loss of a major part of the body, interior, or a
car dragging on the track surface must be repaired within 3 laps. You will be black flagged after the 3rd
lap.(The power will be turned off on your lane).
Cars will be impounded after qualifying. Cars may not be touched by driver or pit crew until the power
comes on in warm up.
Lane change is the driver’s responsibility. No compensation will be given for incorrect changing of lanes.
The racer must race body & frame presented at tech; all other parts may be changed.

Race Day Procedures


There will be no qualifying for 11 drivers or less. Lane choice will be randomly selected.
If there are12 or more entries the qualifying order will be randomly selected.
Qualifying will be for 1 minute on a lane selected by the race director.
Overall ranking will be determined by the total laps and sections.
Ties will be broken by the best lap time and then the order of tech in.
Any driver who misses their qualifying time will be ranked in last position.


Every race will be run as a main starting with the slowest and ending with the fastest. (i.e. C-main runs
before the B-main, and the B-main runs before the A-main.)
If there are 11 or less entries a round robin will be run.
If possible the number of drivers in each main will be equal; if not the mains will be filled from the
slowest to the fastest (i.e. if there are 13 racers there will be 7 in the B-main and 6 in the A-main).
There will be a 2 minute warm-up before each main.
Each driver will race for 3 minutes on each color in Group 10, JRL, and B-Production; 4 minutes in Open
Group 12; F-1 1/32 Eurosport, and 1/24 Eurosport.
There will be a 1 minute intermission between heats in all races.
Work may be done on cars at any time during the race, or during the lane change in Group 10, JRL, BProduction,
and Open Group 12.
Work may not be performed during the lane change during F-1 1/32nd Eurosport, 1/32nd Eurosport, or
1/24th Eurosport. The only things that may be done to the car during the lane change are changing the
lane sticker, pushing in body pins (not replacing), and straightening the braid (not replacing). Any other
work must be done when the power is on. A 50 lap penalty will be imposed if anyone is found in
violation of this rule.


Drivers, at the end of their main, must marshal the next main or whenever called upon. Drivers in the Amain
must marshal the first main of the race (i.e. – in the event of 3 mains, the A-main driver will
marshal for the C-main, the C-main will marshal for the B-main, and the B-main will marshal for the Amain.)
The number of marshals must be the same in each main.
You will be disqualified for failure to marshal and will forfeit payout.

Track Calls

For an unmarshalable car (i.e. In the middle of the straight in front of the drivers; under a bride or in the
middle of the track where a marshal cannot reach).
A rider is a track call.
A car on the floor near the track is NOT a track call. A car on the floor under the track when the marshal
must climb under the track IS a track call.
Regardless of the number of cars off in a single corner, it is NOT a track call.
A warning will be given for the first illegal track call and a 5 lap penalty for each successive call.


After each main, a drivers finishing position will be a result of the sum of the laps completed and the last
lap sections. The number of laps made can only be a result of the lap counter. No lap correction is made
for lane jumping (riders) or missed counting due to the cars braid. The race director must check the lap
counting system if there is a sustained problem. If a problem with the lap counter occurs, then the race
director must rerun the current segment. If the lap counter fails to operate, the raceway must provide a
spotter to count laps.

Technical Specifications

Maximum width for all 1/24th classes (excluding pins and tape): 3.269" (83mm)
Maximum width for 1/32nd Eurosport (excluding pins and tape): 2.519” (64 mm)
Maximum width for 1/32nd F-1 Eurosport (excluding pins and tape): 2.677” (68mm)

Rear Tires

Must have maximum width .815" (20.7mm) for all 1/24th classes with the exception of 1/24th Eurosport.
Maximum rear tire width for 1/24th Eurosport is .900”.
See individual class rues for maximum tire width for 1/32 F-1 Eurosport and 1/32 Eurosport.
The rubber portion of the tire contacting the track surface must be black

Front Wheels

Sticker front wheels are legal for all classes.
Minimum diameter .500” (13mm).
If sticker fronts are not used front wheels must turn on their centers at 90 degrees to the tracks surface
and have black rubber / plastic perimeter.
The loss of front wheel(s) during the course of a race will not be considered an infraction.
See individual class rules for maximum tire width for 1/32 F-1 Eurosport and 1/32 Eurosport.

Rear clearance

There is no minimum clearance provided the gear is level with, or above the bottom of the chassis.
This rule will be strictly enforced in order to protect the track surface.
No air control devices allowed. Body bulletproofing that extends the side dams will be considered air
The body must cover the whole chassis including the rear axle & guide flag with the exception that the
ears at front of chassis may extend out past the body.
The body must be fixed to the chassis with only pins or original manufacture body clips.
Windows must be clear and all 4 wheels must be completely visible from the side.
A number must be displayed in at least 3 different positions.
Numbers must be a minimum .25" high and be decals, vinyl, or painted from the inside.
All cars must contain a painted and detailed (3 different colors) 3 dimensional driver with helmet,
shoulders, arms and steering wheel mounted in the original cockpit position.
Interior must cover the entire cockpit opening.
The body must not deviate from its original form as produced by the manufacturer.
The body must be opaque when viewed from the top and sides except for wheel openings or other
openings which represent actual openings on the real car.
Wheel openings may be cut out +.063 (i.e.1/2" front wheels can have 9/16" opening).
Diaplanes may be trimmed off the front of the body.


Unrestricted in all classes.

Group 10
3 minute heats


All B-Production chassis rules will apply.


Any GTP style body is legal. Bodies with air control are specifically illegal.


Any D-Can based motor with any single piece, full high D-Can magnet.
Any commercially available, balanced or unbalanced, 16-D armature. (Super 16-D arms are specifically
May interchange manufacturer parts
May notch can and/or magnet for axle clearance.
May drill 1 small hole per side to ease magnet installation.
May use ball bearing in can end of motor only..
Minimum stack length .600”.
No shunt wire or spring insulation may be used.

3 minute heats


Kelly/Pro-Slot: FX chassis (all varieties).
Parma: Flexi 1, Flexi 2 (may interchange pans and use Parma hot-wing), Flexi 3 (with any flexi 3 pan),
Flexi-4, and Flexi 5.
Champion: Turbo Flex, Astro Flex, (may use aluminum pans).
JK- Cheetah (may use light weight pans), Cheetah 7(may mix & match pans & center sections; may
reverse pans), Scorpion 1,2, & 3 , Cheetah 11 (C and D-can versions), Cheetah X24, Cheetah X25
Mossetti: Titan & Titan SS
The chassis may not be cut and cannot be bent from its original shape.


May grind motor bracket for gear clearance.
Pan movement may be increased or restricted.
Front wheel towers may be trimmed.
Rear axle vertical location may be changed.