11) The body must be fitted with the manufacturer’s original or exact replica bumpers, heads, rollover bars, etc. in their stock locations.
12) Cracked or broken body mounting posts may be repaired or replaced with the use of glue or a plastic sleeve around the original post or a plastic tube in place of the broken post.
13) Other than the plastic post reinforcements stated in Body Rule 12, no additional weight can be added to the body.
14) The body may be lowered and lightened by removing material through the process of grinding, or scraping, as long as Body Rule 10 is not violated. Body cannot be heated or reshaped from the original cast of the body.
15) Bodies that have a separate roof and windshield casting/molding and have molded in interiors (also known as Hardtops, e.g. Aurora’s ’65 Mustang) may have the interior portion of the body completely removed.
16) Front and rear wheel wells may be opened up for tire wheel-well clearance. This opening may be no larger then 1/8-inch drill bit around entire wheel-well and tire.
17) Wheel-wells must not be modified in such a way as to allow the use of any other wheelbase that is not originally intended by the manufacture of the body.
18) Any body mounting screw may be used. Non-magnetic screws are recommended, so a passing car will, not pick up, a loose screw, thus causing damage to the car and/or the track.
19) Both front and rear screws must be used and must secure the body to the chassis at all times.
20) The front windshield must be plastic or resin, clear or painted, may be glued in place or molded in, and must fill the window frame. Tape windshields are not allowed. Side and/or rear windows may be removed.
Rolling Chassis Assembly Regulations:
1) Only original Aurora Thunder Jet chassis assemblies with non-plated copper electrical components are allowed. Brush springs may be bent to alter brush tension. Pickup shoe hanger plates may be slightly bent.
2) The rolling chassis’ axle and armature holes may be slightly opened up for increased clearance. The truck hole cannot be utilized in any way.
3) The rolling chassis assembly must not be fitted with bushings.
4) The chassis may be trimmed slightly (no more than .010”) to allow for crown gear tooth clearance.
5) Any original Aurora T-Jet pancake gray armature with two laminations, with its original commutator, and all of its original unmodified windings may be used. The armature may be, (balanced, and trued)
6) Each armature pole is to be measure across two separate commutator segments. The Average of all three poles must be 16 ohms or greater. I.e. pole A measures @ 15.8 ohms, pole B measures @ 16.2 ohms and pole C measures @ 16.0 ohms This armature is Legal. All measurements are to be taken at the current available room (ambient) air temperature. The warming of either the commentator or the armature is not allowed before and during measuring. (The combined total ohm reading of all three armature poles must equal or exceed 48 ohms)
7) Any original Aurora magnets or Johnny lightning magnets must be used. Johnny Lightning magnets may be sanded to fit the chassis. The distance between the magnets must be a minimum of .700; no exaggerated sanding is allowed to close the arm gap. This will be teched using our custom designed, specially fabricated plug.
8)Magnet shims may be used. Shims must be non-ferrous. No shims are allowed either under or on top of magnets.
9) Any flat top and bottom carbon/copper motor brushes are allowed. Brushes may be scored with one score line or an “X”. No exaggerated deep cuts or crevices allowed. This will be checked at tech.
10) Any stock or commercially available stock replacement 14 tooth brass armature pinion gears are allowed.
11) Any stock or commercially available stock replacement 24 tooth brass idler and driven gears are allowed.
12) Any stock or commercially available stock replacement 9 tooth brass pinion gears allowed.
13) Any stock or commercially available stock replacement 15 tooth crown gears are allowed. The crown gear boss may be trimmed or a spacer may be added to adjust for proper gear mesh.
14) Only original Aurora drive gear shaft must be used. The shaft may not be trimmed, cut, or, shortened.
15) Gear tooth friction surfaces may be deburred by polishing, filling or sanding.
16) Gears may not be chamfered, lightened or relieved.
17) Any front, rear wheel and, tire, axle may be used, but the front tires cannot be smaller then .300" diameter. Maximum lateral movement in the front wheel assembly is 0.031.
18) Front and rear axle shim washers or spacers are allowed. Front axel, shim washers or spacers must be on the outside of the frame rails. Refer to Chassis Rule #13 for adding spacers around crown gear.
19) Any stock or stock replacement pickup shoe must be used. These shoes must have a factory formed step, and the step must be unaltered except to allow flat pickup shoe contact with the track rail. Replacement shoes can be American line shoes #313. Thunder shoes BSRT #504, are allowed. The radius bend on front of the pick-up shoe below the slot may not be altered in anyway.
20) The “ step” in the pick-shoe must remain intact and be unaltered, except that only
the first bend in the step (Bend #2) may be changed slightly so that proper “pick-up shoe “ to” rail” contact can be achieved. NO attempts to “flatten” the “step” are allowed. The area between bend 1 and 2 may “flattened” to achieved better contact with the “rail”. The front, vertical, slotted portion of the pick-up shoe may be bent to limit shoe travel. The rear, hook portion of the pick-up shoe may be bent to limit shoe travel and shoe tension.
21) The pickup shoe spring may be cut, stretched, shimmed, or compressed.
22) Any amount of the vertical gear plate rails above the upper horizontal plane may be removed. No amount of material may be removed from the gear plate at or below the upper horizontal plane. The serial/patent numbers and letters must also remain intact.
23) Guide pins must be plastic and must be of a design essentially similar to the original Aurora black plastic front guide pins. Guide pin may be, trimmed or bent. Countersinking screw hole on front guide pin is allowed.
24) Glue may be used on a rolling chassis assembly only for the purposes of attaching solid brass gears, guide pin or axles. Solder may be used to attach metal gears to their metal shafts.