Contest rules RC Drag racing

This is just an excerpt of the international (IMDRA) rules for radiographic drag racing and contains the main rules regarding the "Drag strip", different racing classes, technical rules regarding vehicles by class and more general rules relating to the organization of a RC drag racing event.

This translation is limited to electrically powered rc

Rc Drag strip specifications:

Length and shape

The surface of a runway should be as clean and smooth as possible, the path must be completely horizontal. The length of the track is exactly 40.23 m (132ft) and is exactly rectangular. Monitoring should be done through cross measurement from corner to corner.

The surface of the runway, differences no more than about 15.24 cm in surface structure over the entire length of 40.23 m. The minimum width of each lane will not be less than 2.43 meters, but has no maximum. The length should be exactly 40.23 m. The track may be carried out in concrete, asphalt or a similar surface.

Starting Line

The starting line may not be thicker than 5.08 cm in order to compete for a national record. The thickness of the starting line for the start of a match checked.

Rollout Area

At the end of each track is an additional piece of roll-out area is created with a length of between 30 and 60 meters in such a way that the transition area of track to the roll-out takes place without any obstacles. The roll-out area should be clearly marked and identified (for safety) and will at the end have an absorbent mass that can capture vehicles and bring them to a stop.

Traction Fluids

The surface of a track may be treated with sugar and water (100 g / l), or a commercially available traction-enhancing liquid.

General vehicle specifications



The body of the RC vehicle must be complete, painted and finished at the start of the race (day). Unfinished bodies (unpainted, incomplete or otherwise) are not allowed.


The body must be securely fastened to the vehicle and should remain attached to the finish line.


Windows may be painted, reflecting or tinted or otherwise darkened as long as they have a different color than the body. Windows should be remain and may have a few holes for cooling of motor and electronics after.


Dragster-like bodies may drive without a cockpit or windshield.

Rear Body Cutouts

The rear section of the body (valance/bumper panel) may be removed but must retain the original rear side quarter fenders, trunk lid and/or pickup bed.

Body Trim Line

The body may be trimmed above the lower body trim line.
Exception: The body must not be trimmed above the lower door line in Electric Pro Stock Class

Wheel Openings

all wheel openings must have stock appearance. Wheel openings must be as large as the wheel being used (width). covering of the wheel openings with any material is prohibited (center line of the axle must be visible).

Extensions Beyond Body

no portion of the chassis, wheels, tires or equipment my extend beyond the body. Tires may extend beyond the body/fenders on bodies representing early model coupes or roadsters only. Wheelie bars may extend beyond the body.


There are three (3) electric motor classifications currently in use in IMDRA competition. They are as follows:
Sportsman Racing Motors - any ferrite magnet modified motor that is mass produced and commonly available through hobby distribution. Motor retail cost must not exceed $95.00. Ball bearings and adjustable timing are permitted. Re-truing of the commutator is permitted. Internal modifications to motor can, armature or magnets are not permitted. The maximum motor can dimensions are: diameter, 2.5 inches, length, 3.5 inches (end bell to end bell).
Professional Brushed Racing Motors- any cobalt or rare earth magnet based motor that is mass produced and commonly available through hobby distribution. The maximum motor can dimensions are: diameter, 2.5 inches, length, 3.5 inches (end bell to end bell).
Note: All classes using these motors must be equipped with a quick operating motor power disconnect devise that is easily accessible from outside the body.
Professional Brushless Racing Motors - any 540 cobalt or rare earth magnet based motor that is mass produced and commonly available through hobby distribution.
Note: All classes using these motors must be equipped with a quick operating motor power disconnect devise that is easily accessible from outside the body.


All cars (see exceptions below) must use either nickel-cadmium (NiCad) or nickel metal-hydride (NiMH) batteries of (Sub-C). The individual cells may have no more than 1.2 volts nominally rated capacity of Sub-c size.
Lithium Polymer - (LiPo) and Lithium ion (Li-ion) batteries are allowed in transmitters and receivers in all classes and as a power source in all classes.
Lithium Polymer - (LiPo) and Lithium ion (Li-ion) batteries shall ONLY be charged with chargers designed and recommended by battery manufacturers and sold for this purpose.


Every vehicle (see exceptions below) must use NiMH batteries. The maximum voltage per cell should not exceed 1.2 volts nominal.

Lipo and Li-ion battery `s

Lithium Polymer (lipo) and Lithium Ion (Li-Ion) battery `s are allowed in all classes of vehicles, transmitters and receivers.

Lithium Polymer (lipo) and Lithium Ion (Li-Ion) battery `s may only be loaded with chargers that are suitable and as such are sold by manufacturers.

Portable Charging Units (Hot Boxes)

Hot boxes are allowed in the staging lanes. Cars must be disconnected from the hot boxes before the car and driver enters the drivers' racing area and may not be reconnected.
Radio Receiver Power Switch
All cars shall be equipped with a radio receiver power switch with clearly marked "On" and "Off" positions. The switch must be easily accessible and visible from outside the car. Drivers are cautioned to avoid starting the motor while the car is being handled.

Starting Formats

There is one (1) starting format in general use in IMDRA competition:
Pro Tree - in which, following staging, three Amber lights will activate simultaneously, followed by the Green start light .400 seconds later for both lanes. All classes run Pro tree start.
All cars must self-start in order to constitute an official qualifying attempt. Contestants are permitted one car per class entered in any event. The Event Director may permit a contestant to change cars under the following conditions:

Ladder Charts

Competition paintings are based upon the established IMDRA "ladder" charts. Qualifying elapsed times determine the ladder positions. In a 16 care field, for example, the ladder chart may look like this: 1 vs. 16; 2 vs. 15; 3 vs. 14, etc. Once the pairings are established, they may not change unless the designated Race Officials determine there is sufficient justification. In situations where the field is not filled, the ladder chart type is determined by the number of contestants.

Handicapping will be determined by comparing the margin between the two competitors' individual dial in times, the same system used in bracket racing competition.
Single Passes

A competitor is declared the winner of a single pass once the car has staged and the Green start light is activated. I a competitor crosses a lane boundary during a single pass, the elapsed time is voided for lane choice determinations.


All instances of disqualification are subjected to the "First or Worst Infraction" test with the final determination being that of the Event Director. The following specific infractions are grounds for disqualification, suspension or expulsion:

Suspension From Competition

Assault by any member and/or participant shall result in a suspension form IMDRA sanctioned competition for a minimum of 180 days. A longer suspension may be imposed at the discretion of the Event Director.
Shutdown Marshals
Competitors must provide a pit crew member, which shall remain a minimum of 10 feet from the track edge (in the shut down area) while awaiting the arrival of their assigned car, to retrieve the car, shut off the receiver and disconnect the motor power after the completion of each race.

Staging and Lane Choice

Breakdown, failure or no show

As a winner of a race by means of mechanical or electrical defects of nature can not participate in the next race, or not shows up, the losing participant will not benefit. The participant who is assigned to the participant who can not participate because of a defect, will drive a single race.

Technical protest

Each participant who wants to note a protest against the technical condition of the vehicle of another participant must apply in writing to the end of the competition day.

Along with the written protest, the following protest fee must be paid to the officials:

The competitor under protest must disassemble their car under the supervision of a Race Official. If the car is found to be Legal, the competitor under protest will receive the fees submitted with the protest. If the car is found to be ILLEGAL, the competitor under protest will be disqualified and the fees returned to the competitor who filed the protest.
Failure to present car for inspection automatically disqualifies a competitor under protest.
In the event a Race Official submits a protest, the fee requirements are waived. If the car is found to be LEGAL, the competitor under protest will receive replacement cost only.
Claiming Rule A "sportsman" racing electric motor can be claimed at any time during an event but cannot be picked up until the end of that event. (Claiming is on a first come first served basis).

National Records

The IMDRA National Record Program is conducted at every National racing event (Pro categories only). Each record run must occur during qualifying and/or elimination rounds and is in strict compliance with the starting, running, finishing, timing procedures of IMDRA. National records will NOT return to open status at the beginning of each calendar year. In addition, the following procedure apply:

Vehicle specifications and guidance

Vehicle Class Specifications and guidelines

General Guidelines: Safety will be observed at ALL times. These rules and guidelines are set in place to provide for safe and competitive classes and everyone and equal opportunity to compete. Racers are required to adhere to all manufacturers safety specifications. All specifications are based on real car specs., as close to 1/10th and 1/4 scale as practical. All cars must be wheel driven. This means that the cars power must be directed into the tires, not thrust driven.
All coupler/shaft drive vehicles must have a protective cover over the coupler/shaft area in the event of a driveline failure. This cover must be a minimum of .030 lexan, cover 75% of the coupler/shaft and attached securely with screws. This cover must be in place whenever the vehicle is in operation. This is to mean pit area and racing surface.
Absolutely "NO" Propylene Oxide or Pure Nitro allowed on the premises. Mixing fuel at the track is not allowed. Lithium batteries allowed in transmitters, receivers and as a power source in all electric classes. Lithium batteries as a power source, maximum temperature 110 degrees Fahrenheit
Any full bodied and/or production type car having fender wells must have a fender visually lower than the front or rear axle center axis. This means that you MUST be able to see the front and rear axle on any production type or full bodied car. No tires protruding above the bodyline of the car. All cars must be painted, no clear bodies allowed to enter competition. Wheelie bars are not part of the measured chassis length. All classes are .400 pro tree including bracket classes.
A class shall consist of at least four (4) cars. In the event that there are not enough cars in a specific class, 2 similar classes will be combined to make a full class. (example: Top Fuel Funny Car and Top Fuel Dragster will combine if either class has less than the minimum required car field. Four (4) car fields will not run a B-Side, must be six (6) car fields in order to run a B-Side. 15
NOTE: A record can only be set in the specific class that car was originally entered in. If a record is set in a combined class, then only the record will pertain to the specific class that the care was intended to run in NOT both classes of the combined entry. A National record can only happen during qualifying or eliminations and only at a national event. All records to be backed up within 1%.

Vehicle Class Specifications

Bracket class / entry class

Pro Street Nitro and Electric

For electric vehicles:


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