Definition

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2WD: 

Shall constitute one rear drive axle with 2 wheels only. 

4WD: 

Shall  constitute two drive axles; one rear drive axle with two wheels and one  front steer drive axle with two wheels. On pulling vehicles the front  and rear tires will be no more than 1 inch difference in diameter. On  racing vehicles the front and rear tires will be the same size in  diameter and width. 4WD vehicles will be true 4WD vehicles. The Big Rig  class is the only class allowed to use tandem drive axles. 

Battery: 

Shall  be NiCd or NiMh cells only. Factory built batteries will be encased in  the original factory wrapper with the label attached. All other  batteries must be in clear shrinkwrap or clear tape. No added opaque  tape or shrink wrap allowed. Batteries will be readily available R/C  type. Example of a non-usable battery is the military issue 3volt “C”  size. Individual class limits will be listed in that class section of  this rulebook. 

Body: 

Shall be the shell that gives the vehicle its shape and allows it to resemble a full size car, truck, or tractor. 

Chassis: 

Frame of the vehicle not including suspension, steering, body or gearbox. 

Dual wheel: 

More  than one tire on one rim or a combination of more than 1 tire with one  rim on each side of an axle. No dual wheels are permitted. Foam tires  may be glued together to make 1 tire on 1 rim and shall not be  considered dual wheels. 

ESC: 

Electronic Speed Control 

Factory production: 

Any  R/C product manufactured by a recognized R/C supplier in quantities of  no less than 100 units per year. Bodies are not required to be “factory  production” as long as they are realistic. Please refer to motor rules  for specifics on them. Factory production vehicle: Any factory  production vehicle kit originally manufactured for use other than a  pulling vehicle. For example a Tamyia Clodbuster or a HPI Wheelie King  are “Factory Production Vehicle”. 

Front axle: 

The  device mounted at the front of the vehicle in order to provide a means  for steering. The axle will be mounted so that the wheels line up with  the wheel openings in the body. Exceptions will be made for “Factory  Production Vehicles”. The tires on hinged or floating front axles are  not allowed to contact the track surface if the vehicles front end lifts  ¾ of an inch or more. 

Front wheel openings: 

The  open place that allows the front wheels to have clearance to move when  turned to the right or left. The wheel openings will be located behind  the front most part of the body. Front wheels are not allowed to extend  more than one inch on either side of the body. Exceptions are made for  4WD vehicles, Factory Production Vehicles that must run the original  suspension, and replicas of full size vehicles. 

Gearbox: 

The  unit consisting of the gears, belts, chains, case and/or mounting  brackets. The gearbox is the means for transmitting the power from the  motor to the wheels. An additional gearbox refers to a second gearbox  that is attached to the main gearbox. 

Hitch: 

The  apparatus used to hook the pulling sled to the vehicle. The hitch shall  incorporate a 5/16 inch hole for the sled hook and will be no more than  ½ inch from the rearmost end of the hitch drawbar. The hole must be  located behind the axle. The sled chain will have a clear path to the  hole with no interference from the vehicle. The hitch is to be fashioned  from a strong and rigid material. All hitches will be rigidly mounted.  The hitch must be mounted in such a way to not allow any movement  longitudinally, vertically, or horizontally. Adjustable hitches are  permitted but must be locked in position when pulling. Unless otherwise  noted in the class rule the maximum hitch height is 4”. The following  will also apply to the 2” maximum hitch height classes. The hitch is  measured by placing the vehicle on the tech table, without any downward  pressure during inspection. Horizontal hitches will be measured to the  top of the hitch. Vertical hitches will be measured to the top of the  hole. Any hitch with multiple holes will have the holes above the  maximum covered with tape. 

Intentional jerking: 

The act of deliberately manipulating the controls of the vehicle in a way to advance the sleds position in an erratic manner. 

MSRP: 

Manufacturers  Suggested Retail Price. Maximum motor size: The total outside length  and diameter of the motor not including the output shaft. 

Measuring device: 

All measurements are to be made with a normal ruler. Micrometers and the like are not to be used for tech. 

Monster truck: 

A  vehicle with oversized tires designed to go over large obstacles at a  fast pace. Original: As manufactured and unmodified. Production Pulling  Vehicle: Any vehicle manufactured specifically for pulling. This may be  “factory production” or scratch built. 

R/C: 

Radio controlled. 

R/C Motor: 

A motor that is designed and built for the R/C industry. 

Readily available: 

Available  off the shelf from hobby shops, distributers, or from retail mail order  outlets. Special order or custom made items are not considered to be  “readily available”. Scale appearance: Having the scaled down look of a  full size vehicle or part. 

Sled: 

The device used to create a drag on the pulling vehicle in which to stop the vehicle. 

Stock: 

Factory original for that vehicle or piece of equipment. 

Traction compound: 

Anything  that is foreign to that tire. Any substance that was not made for, put  on, or into the tire at time of manufacture. Tire glues are allowed to  mount tires to rims or to glue two tires together in order to make a  wider tire. 

Tread width: 

The width of the tread only. This does not include the sidewalls. 

Tube chassis: 

A  chassis that is constructed of square, round, hollow or solid tubular  stock. The chassis is the component in which the gearboxes, suspension,  radio equipment, battery, body and all other vehicle components are  attached. 

Wheel: 

An assembly consisting of one tire and one rim. 

Wheelie bar: 

A  device mounted to the rear of the vehicle to prevent the vehicle from  flipping over backwards once the vehicles front tires loose contact with  the pulling surface. This device is made up of a single or pair of bars  with one or two wheels mounted on the bars. Wheelie bars are permitted  in all classes. They may not extend past the legal length of the vehicle  and may not interfere with the operation of the pulling sled in any  way. Skid plates are not permitted. In the dirt classes skid pads may  replace the wheels on wheelie bars for scale appearance. Flexible straps  for static grounding are only permitted to touch the pulling surface.  Wheelie bars are not to be use to rock the vehicle back and forth. This  would be considered intentional jerking.