Blue Hills Raceway

Vintage T-Jet Car Class Rules

Based on the popular Fray in Ferndale Ruleset

Legal chassis and top plates are: Any Original Aurora thunder-jet, T-Dash, Wizz-Jet
Blizzard is NOT legal

All General rules are applicable to this class and shall be followed.

  1. Car including body must weigh between 19 and 24 grams
  2. Electrical system must be copper material and be stock or stock replacement. Plated chassis electrical components or pickup shoes parts are not allowed. Brush tensioners and shoe hanger plates may be bent to adjust shoe tension. Shunts are not allowed.
  3. Chassis holes may be closed or opened for proper clearance.
  4. Brushes must be copper and may be scored with an X or line.
  5. Any stock T-Jet pancake armature that is Aurora 2 lam, Dash 2 or 3 lam, or OS3 is allowed. The armature may be balanced and trued with a minimum 16.0 ohms (measured pole to pole with armature removed from car and checked after a 5-minute cool down). Washers or spacers are allowed on the armature.
  6. Magnets must be ceramic and readily available. Magnets may be sanded to fit the chassis. The distance between the magnets must be a minimum of .700”. Any nonmagnetic materials may be employed to restrict the movement of the magnets and are not allowed under or on top of magnets.
  7. Any solid brass stock or stock replacement gears may be used and must be a minimum of .045” thick. Only 14T (motor pinion), 24T(idler), 24T(driven), 9T (drive pinion) are allowed. Any crown gear is allowed and must be stock or stock replacement, 15T, and installed in the car the diameter must not be smaller than .300”. Crown gears may be trimmed or spaced to adjust for proper gear mesh.
  8. Gears cannot be cut, lightened, drilled, chamfered, or relieved. Polishing/deburring is allowed. Gears may be glued or soldered on the shaft.
  9. There are no restrictions on axles, drive gear shafts, wheels or tires. Rear wheel weights are not allowed.
  10. There are no restrictions on front ends except they must be stock or stock replacement and may be spaced on the outside of the frame rail only.
  11. Pickup shoes shall be stock or stock replacement. Ski shoes are not allowed.
  12. Pickup shoes springs may be any material and must be cylindrical in shape.
  13. Gear plate rails may be trimmed to the plane of the top plate.
  14. The guide pin must be plastic material stock or stock replacement. It may be countersunk and glued in place but shall remain in the stock position.
  15. With exception of the guide pin location, the use of glue shall not be allowed on the chassis, top plate, or magnets.

    Body Regulations
  16. All bodies shall resemble a 1:1 or concept car and originally manufactured with mounting posts in the front and back for 2 screw mounting. No open wheel bodies are allowed. All bodies must be mounted with 2 screws.
  17. Body must be plastic from injection molding, resin cast, or 3D printed and cannot contain any ballast, fillers (other than pigment), added weight, or magnetism.
  18. The body must cover the front and rear of the chassis when viewed from above.
  19. When viewed from the back, front, or side, the line in upper surface of the top plate (not including rails) must be shielded by the body.
  20. No additional weight may be added to bodies. Glue is allowed for repairs and windshield installation.
  21. Bodies may be repaired, lightened, and lowered as long as they fit the existing rules.
  22. Bodies cannot be manipulated by heat to intentionally warp.
  23. Wheel-wells may be opened but must not be exaggerated past a 1/8” size around the tire from the side.
  24. Complete front windshields are required and must be moulded, vacuum formed, or injection moulded plastic. Side and/or rear windows may be removed.