V.H.O.R.S. Official Rulebook
- as of 12/04/03 - 

Writing Credits: 
Information borrowed from 
E-Mail for that site can be sent to Mr. BigStuff.


General Rules
Commutator Brushes

The following rules are in effect for the Vintage HO Racing Series. The rules committee reserves the right to change the rules in the interest of maintaining the fairness of the majority of the competition.

These rules are based on the use of original Thunder Jet parts, new parts, after market parts, remanufactured parts and those made by "cottage industries". All parts must be specifically manufactured for the Thunder Jet chassis with the exception of wheels, tires and axles. One of a kind, custom made, or homemade parts are not permitted.

If a racer is not sure his or her car is legal, it may be checked prior to the start of the races. If any driver suspects that another car may not be legal, he or she may "challenge" the other car at any time to verify whether or not it is within accordance to VHORSRules.

Once each driver has qualified for a starting position, his or her car will be pre-inspected for compliance to the rules. The car(s) are then impounded for the balance of the event day. 

The overall top 4 finishers will have their cars fully inspected at the end of the final heat. 

The rules committee members present will address any questions or interpretations of the rules and their decision will be final.


  • Vintage Style Bodies: Racer’s car bodies must be molded in a traditionally vintage style, without intentionally added weight or "handling pan" characteristics, or thick moldings, side panels. Some bumpers are thicker to prevent damage in a crash, this will be handled on a case by case basis. Thick screw posts are also permissible, however if there is obviously excessive amount of material the body may not pass inspection.
  • False Start: A predetermined point on the host track where each starting car must pass in order to declare the heat a valid race. Typically after the first turn set.
  • Cottage Industry: Any manufacturer of T-Jet parts who is not a commercially known manufacturer. Thus, availability of said products is not obtainable on the common mass retail market. More so these products are procured direct from the manufacturer themselves or a specialized store or location such as online auction, slot car shows, etc.
  • Post-Inspection: The act of disassembling a racer’s car in order to verify the car is within proper rules compliance for the event.
  • Pre-Inspection: A driver’s car is inspected by the Rules Committee or a delegate responsible for car inspection at the current event. Upon passing pre-inspection the race is deemed “legal” for the duration of the events that day. 
  • Track / Track Call: In the likely event of an accident during a race, or a de-slot in a location which is not easily reached by a Turn Marshal, either the Racer or a Marshal may call out “Track”. This signals the host or track operator to halt the current race. Drivers are not permitted to work on or modify their cars unless the “Track” call is for a mechanical malfunction. The race will resume once the accident or de-slot is cleared.
  • Mechanical Malfunction: An occurrence by which the car or controller is not physically operable. For example, slipping gear, missing tire, meltdown, etc. would constitute a mechanical malfunction.
  • “On Market”: In reference to a new product either by a Cottage Industry or known manufacturer who introduces a new product to the slot car market. For car bodies only: bodies must be from a production run of at least 100 pieces and publicly available for at least 60 days prior to the event. All other items must be publicly available worldwide for at least 60 days prior to the event. 
  • Manufacturer: Designation for mass production and cottage industry producers of HO slot car related items and accessories.
  • Handling Pan: Any metal or plastic piece attached to the bottom of the car to improve handling. This also includes extra molded or attached plastic/resin into a body for the same effect. 

General Rules

  1. The lot of attendees will determine starting positions of drivers for the race(s).
  2. Drivers will be given ample time to run practice laps prior to racing. It may become necessary to limit the practice time of each driver should there be a large number of drivers.
    NOTE: If you need practice time on the hosting track, plan on getting to the event early enough to do so. Late starts due to last minute practice sessions hold up everyone and makes for delayed starts to events.
  3. Each driver will race all lanes in a rotating order, laps will be recorded and completed sections will be added at the end of the fourth heat. 
  4. All drivers will be expected to take their turn marshalling the track while not racing.
  5. Drivers are not permitted to marshal any cars during the races. Any violations will result in penalties. 
  6. Between heats drivers will be allowed one minute to clean their tires, pick up shoes and make any other adjustments necessary without disassembling their car.
  7. No additives are permitted on the tire surfaces. E.g. belt dressing, tire dressing, oil, etc.
  8. If a driver experiences a mechanical difficulty during a race, the race will be stopped and he will be allowed three minutes to rectify the problem. Racing will be continued after three minutes. There will be a limit of two repairs per rotation. 
  9. In the event of a multi-car accident, the timer and power will be stopped to allow the marshals to put the cars back on the track.
  10. A call of "Track" will stop the timer and power to the track. 
  11. Turn marshals or drivers in the case of multi-car accidents, de-slotting out of the reach of a turn marshal, cars accidentally switching lanes, or crossing the lap counter in error may call "Track".
  12. "Track" will be called automatically for any car that goes completely off the racetrack table.
  13. Turn marshals will do their best to replace cars to the track in the least amount of time.
  14. Turn marshals are urged to attempt to replace the "first off" car "first on".
  15. A false start will be declared if any car de-slots before completing the first series of turns as determined for each track. Cars will be returned to the starting line and the race will be started again.
  16. Only one false start will be declared per race/rotation.
  17. The track surface should be "wiped down" prior to the start of qualification heats (if there are any) and before the start of any final heats.
  18. Following completion of their own heat races, drivers are required to marshal the next set of heats.
  19. Track power will be terminated at a predetermined time on race day in order for the host to start the event on time.
  20. No one will be permitted "free power for just a second" to test their car. (Test strips, or 9volt batteries are often available.) 
  21. If a car fails to start, a false start will be called. At the next start, a track marshal will "push" any/all cars to ensure that everyone leaves the starting line.
  22. After racing your heats you are absolutely required to marshal the next round of heats.  


  1. Each racer/participant may have only one car pre-inspected for the entire event. There will be no substitutions or replacements unless the Rules Committee makes an exception under extreme circumstances. Such as, if a car burns up, has a melt down, or is physically unfit for participation as deemed by the event Rules Committee.
    NOTE: If the event is the NJ Shoot-Out, then two cars may be presented for pre-inspection for the events.
  2. Car weight requirement of fully assembled cars must be from 19.00 to 23.00 grams. Any car, which is over, or under the weight limits, will not be allowed to participate in an official VHORS event.  


  1. Bodies must be of the hard shell variety. (No vacuum formed bodies.)
  2. Bodies must be complete with windows, bumpers, drivers, or roll bars as originally manufactured.
  3. Bodies must be originally manufactured with two screw posts specifically for mounting to a Thunder Jet Chassis. (E.g. Aurora, Model Motoring, Bauer, Faller, Playing Mantis, etc.) No modified AFX, Tyco, LifeLike, G-Plus, etc. type bodies will be permitted.
  4. Cottage Industry bodies must meet the VHORS defined “On Market” definition requirements.
  5. Body must be fastened to chassis using two screws.
  6. Bodies may be hollowed out to lighten the weight but cannot be cut through.
  7. Interiors may be removed from bodies that have a fully covering roof.
  8. Fender wells may be cut only enough to accommodate oversized tires.
  9. Fenders may not be completely removed.
  10. Wheel wells may not be cut to allow changes to the original wheelbase of the body.
  11. Screw posts may be cut to lower body.
  12. Split screw post may be repaired using plastic or aluminum sleeves only. No brass.
  13. Screw posts may be replaced with plastic only and must be positioned at original location.
  14. Body must not exceed original manufactured width.
  15. Windshields or windows may be sanded to allow body to sit lower, but windows must fill window opening in the front and rear. Side windows, however, may be removed.
  16. Spoilers, scoops, wings, exhaust pipes, etc. may be added to enhance the car's appearance but must remain within the 1 5/16" width limit.
  17. Fenders may not be flared unless originally manufactured as such. 


  1. Chassis must be stock Thunder Jet with all copper components.
  2. Bearings and bushings are not permitted
  3. Weights and handling pans are not permitted.
  4. Chassis cannot be cut, sanded or drilled in any way. The only exception will be rule number 5 below.
  5. Gear plate rails may be cut or sanded only to lower the body.
  6. Pick up shoes and springs must be stock copper Thunder Jet parts. Pick up shoes can be any copper replacement. "Ski" shoes or other pick up shoes where the original contact point has been lengthened are not permitted.
  7. Pick up shoes may be bent to allow better surface contact with the rails but must remain stepped. The step point must remain at its original location and be as close to the original step height as possible. The length of the contact point must be within a few millimeters of the original contact point length.
  8. Pick up shoes cannot be weighted.
  9. Shunt wires, "tiger tails" or other soldering on the bottom of the chassis is not permitted.
  10. Guide pins must be original design, black plastic. No rear, swivel or metal guide pins are permitted.
  11. Guide pins may be glued to chassis but two mounting screws still must be used to hold the body on the chassis.
  12. Gear plate clamp may be bent or dimpled but may not be cut.
  13. At this time there are no acceptable replacement chassis allowed at VHORS events. 


  1. Magnets must be stock Thunder Jet as originally manufactured. Original color combinations such as green/orange, green/white, and black/black (1 magnet has a small white stripe).
  2. Magnets may be shimmed.
  3. Chassis cannot be cut to allow repositioning of magnets.
  4. Magnets may not be sanded or cut.
  5. Magnets may be matched.
  6. No traction magnets are permitted. 


  1. Armatures must be stock Thunder Jet. Thunder Jet armatures are typically painted gray and have green, red or gold windings, or a combination of all three colors.
  2. Armatures must measure 15 ohms or higher when measured from pole to pole.
  3. Armatures may not be balanced.
  4. Armatures may not be re-wound or de-wound.
  5. Currently, there are no acceptable replacement armatures allowed under VHORS rules. Only the originally manufactured Aurora armatures are allowed. 

Commutator Brushes

  1. Commutator brushes must be manufactured of a copper/carbon compound.
  2. Brushes must be flat surfaced on top and bottom, grooved or crowned brushes are not permitted.
  3. Replacement brushes are acceptable as long as they are of the copper/carbon compound material, they are the same style as the original stock T-Jet brushes, and they meet VHORS required “On Market” definition requirements.
  4. Other than cleaning them, brushes must remain otherwise unmodified from their original condition. 


  1. The armature pinion, idler gear and driven gear must be stock brass Thunder Jet type.
  2. The armature pinion gear must have 14 teeth.
  3. The idler gear and driven gear must have 22 teeth.
  4. The final pinion gear must be brass.
  5. The final pinion gear may be 9, 12 or 14 tooth.
  6. Crown gear must have 15 teeth and be of original Aurora black/gray type material.
  7. Crown gear “boss” may be sanded or trimmed to accommodate different gear ratios.
  8. Gears may be soldered or glued to their respective shafts.
  9. Gears may be lapped and polished.
  10. Gears may not be drilled or lightened in any form.
  11. Gears may not be beveled.
  12. Replacement gears from other manufacturers must be of the same materials as described above
  13. Replacement gears must meet the VHORS defined “On Market” requirements. 
  1. Any tire/hub combination is permitted.
  2. Axle nuts, spacers or springs must be kept on the outer side of the chassis. No collars permitted.
  3. Spacers must be made of plastic, aluminum, brass, or steel, no lead is permitted.
  4. Overall width of wheel/axle combination cannot exceed 1-5/16". Cars must pass freely through the tech block.
  5. All four wheels must touch the track.
  6. "Hub caps" or other wheel inserts are acceptable provided they fit entirely within the rim and must comply with the VHORS defined “On Market” requirements.
  7. Front tire/axle may be allowed to float from side to side. Lateral movement may not exceed 1/32" (.03") and total width may not exceed 1 5/16".
  8. Replacement tires, rims and axles must meet the VHORS defined “On Market” requirements. 


  1. Any type of non-adjustable or adjustable (OHM value only) single wound resistor controller is permitted.
  2. Any type of electronic controller without a single wound resistor is not permitted. 
  3. Additional electronics on controllers for changing OHM value is permitted.
  4. Additional electronics or hardware on controllers for changing any type of output power to the car other than OHM value is not permitted.
  5. Additional electronics or hardware on controllers for changing any type of brake adjustment is not permitted. 
  6. Additional electronics or hardware on controllers enabling "coast" or "auto-pilot" features where power is supplied to the car when the trigger is fully released by the operator is not permitted.
  7. VHORS tracks are not wired for brakes, thus only a two-wire hook up is necessary. 
  8. Any controller or replacement parts must meet the VHORS defined "On Market" requirements.