BEACHJET CLASS RULES
All of
these car rules state
modifications that are and are not permitted.
Any “modifications” performed on entered cars or controllers in
violation of these rules will make the car ILLEGAL and/or the racer
disqualified. If anything is not
specifically stated or addressed in the following rules, it is NOT
permitted.
Definitions
These following definitions
apply whenever the following words appear in the rules in CAPS:
STOCK: No
modifications other than those allowed in the rules are permitted.
STOCK REPLACEMENT: Aftermarket
part of similar design to the same STOCK Aurora Thunderjet
part.
No
modifications are permitted.
Commercially Available: Being
able to buy parts from the maker or a supplier.
Note: Although these definitions are self explanatory, examples of
prohibited modifications may be included in certain sections. These examples, in no way infer that other
modifications are permitted. Stock means
Stock, etc.
General
1.
The term “Car”
shall refer to a chassis and body combination and does not insinuate a specific
body style.
2.
Motor vehicles
with at least 1 wheel at the four corners like sedans, sports cars, racing
cars, trucks, emergency vehicles, etc. are all legal.
3.
Cars must be
legal at start and during the heat.
4.
In case of part
or body failure due to race conditions, you will have to fix the car before
being permitted to resume.
5.
One track call
will be permitted per racer per heat.
6.
Two track calls
for the same failure will not be permitted in the same race, even if in
different heats.
7.
Repairs for
duplicate failures will need to be done during race time.
8.
A quick track
call will only be permitted to clear parts off the track. This is a risk that is taken when building on
the edge.
9.
Any car deemed
detrimental to the track (i.e. riding the bottom of the slot, cutting into the slot, or
greasing/oiling the track, etc.) will be removed from
the track and not permitted to race.
10. The complete car must not weigh less than 19.0 grams
and no more than 23.0 grams.
11. Additives are not permitted to aid in traction. This includes glues, oils, dirt, dust or
saliva. Basically anything that will
hinder another cars performance in that lane.
12. The car must not leave anything on the track.
13. Conductive lubes are permitted in extremely moderate
amounts, and only under the brushes and where the pickup shoe meets the
chassis. These lubes must not deposit on
the track during racing or they will be deemed illegal.
14. Weight cannot be added to the bodies or chassis except
on the axles outside the chassis axle holes.
15. Handling pans are not permitted.
16. Traction magnets of any kind are not permitted.
17. Cars must pass freely and easily through the tech
block.
18. All 4 tires must touch the track at the same time when
at rest.
19. Only one guide pin is permitted per car and must
reside in original position. They may be
glued into original position.
20. Except where solder is permitted, lead is not
permitted anywhere on the car.
21. Lubrication of the chassis is permitted at any point
provided it does not make it to the track.
22. One false start is permitted per heat and will be
defined by the race host for the particular track being run.
23. Push starts are permitted at any time.
1
BODY
Requirements ONCE
A BODY IS TECH’D IN, IT CANNOT BE CHANGED
1.
Bodies must be of
the hard shell variety (no vacuum formed bodies) and manufactured by either the
process of casting or injection molding, and be made of resin or plastic.
2.
Bodies must be
originally manufactured with the intention of being mounted, with the use of 2
screws via the 2 body mounting posts, on a/an:
Aurora Model Motoring (which includes Vibrator, Thunderjet,
Wild Ones, Tuff Ones and Xlerators), Bachmann,
Faller, Model Motoring Inc. Thunderplus, Marx, Eldon or Tyco “S” series “HO” chassis.
3.
Bodies must be
fitted with all the manufacturer’s original bumpers,
heads, rollover bars, etc. in their stock locations. Similar aftermarket replacement parts may be
used.
4.
On a convertible
body, any replacement windscreen must be the same height and width of the body
manufacturer’s original windscreen.
5.
No body openings
other than windows and front grills are allowed.
6.
Body must
completely cover the back plastic of the chassis/gearplate.
7.
The front windshield
must be made of plastic and fill the entire frame. They may be glued in place.
8.
There is no “on
market” requirements for bodies, but if a new body is introduced and has not
been made publicly available to the group in it’s
present form 2 weeks prior to the race, then it must be made available in
sufficient quantity at the race. 10 is a
sufficient quantity.
9.
Maximum width is
1 5/16”.
10. Bodies must resemble cars that exist.
11. No blobs or boxes with lids.
Mounting
1.
Bodies must be
mounted using the original two-screw mounting points of the chassis.
2.
Cracked or broken
body mounting posts may be repaired or replaced with the use of glue and/or
plastic sleeve around, or a plastic tube in place of the broken post in the
original position.
3.
Bodies must be
mounted using two screws.
4.
ANY screws may be
used and left loose, but must be tight enough to not fall out.
5.
Rear screws may
be glued.
6.
No weight may be
added to the bodies.
Modifications
1.
Bodies may be
lightened by removing material from the underside.
2.
Any holes caused
by lightening must be filled to original thickness.
3.
Bodies that have
a separate roof and windshield casting/molding, and have molded in “interiors”
(also known as Hardtops, i.e. Aurora’s ‘65 Mustang), may have the “interior” portion
of the body completely removed.
4.
Front wheel wells
must not be modified in such a way to allow the use of any other wheelbase than
that which was originally intended by the manufacturer of that body.
5.
Side windows may
be removed but are not permitted to be oversized to create a small roof.
6.
Lightened bodies
must maintain original outside appearance.
7.
No bubbles, warpage, or excessive repairs.
8.
The body to
chassis mounting posts may be shortened to lower the body closer to the
chassis.
9.
Bodies may be
painted and/or decaled.
10. Once a body has been tech’d
in, it cannot be changed.
Chassis
1.
Only STOCK Aurora
Thunderjet chassis with copper electrics are
permitted. This includes Flamethrower
chassis.
2.
The chassis axle
and armature holes may be slightly opened up for increased clearance.
3.
Added bushings
and bearings are not permitted.
4.
The chassis may
be trimmed slightly (no more than .010”) to allow for crown gear tooth
clearance.
5.
Chassis, gearing,
and shafts may be polished.
6.
Chassis cannot be
cut, sanded, or drilled in any other way unless stated in the rules.
7.
Chassis cannot be
cut to allow repositioning of magnets.
8.
Flashing due to
the manufacturing process may be removed.
9.
Rivets may be
tightened.
10. Replacement rivets are not permitted.
Guide Pins
1.
Only STOCK Aurora
black plastic or similar black or gray replacement plastic guide pins may be
used.
2.
Guide pins may be
cut, trimmed or bent, and may be glued into place.
3.
Guide pins may be
trimmed to allow smooth operation in the slot.
4.
Maximum guide pin
length is ¼”.
5.
Rear, swivel or
metal guide pins are not permitted.
Magnets
1.
Magnets may be
zapped.
2.
Magnet shims may
consist of any material, but may not be a permanent magnet.
3.
Shims must reside
entirely inside the magnet cavity.
4.
Permitted magnets
are as follows:
ORIGINAL
Aurora, ORIGINIAL Thunderplus, Super Two’s, ORIGINIAL
Johnny Lightning , and Auto World magnuts
designed for a pancake style armature.
Tires, Rims and Axles
1.
All front or rear
tire/rim/hub/axle combinations are permitted.
2.
Must be
commercially available at a competitive price.
3.
Only the crown
gear and crown gear shims may reside on the axles between the chassis axle
holes.
4.
Shim diameter
cannot be larger than the tail diameter of the gear.
5.
Crown gear shims
must not interfere with the rotation of the axle in any way.
6.
The center front
axle truck hole may not be used.
7.
Overall width
must not exceed 1 5/16” when rims are extended to their maximum width.
Electrical
1.
Pickup shoes must
be STOCK copper Aurora or any commercially available stock replacements.
2.
Pickup shoes may
be bent, but must retain a step at its’ original location.
3.
Pickup shoes
cannot be weighted.
4.
Shunt wires,
“tiger tails” or other soldering on the bottom of the chassis is not permitted.
5.
Lighted chassis
must have the light bulb, clip, and wire completely removed.
6.
Pickup shoe
springs must be ORIGINAL
Aurora or any commercially available replacements.
7.
Pickup shoe
springs may be shimmed with armature spacers to increase spring pressure.
8.
Shims must fit
completely inside spring hole in the chassis.
Commutator Brushes
1.
ORIGINAL Aurora
or ORIGINAL aftermarket copper/carbon brushes of the similar style and size
as the original stock T-Jet brushes must be used.
2.
Brushes must be
flat surfaced on top and bottom.
3.
.060” - .075” in
height and in the stock position.
4.
Domed or silver
brushes are not permitted.
5. Cutting or drilling brushes is not
permitted.
6. Scoring brushes is legal.
Brush Springs
1.
Brush springs may
be bent in any fashion to allow different brush tensions and/or to stop brushes
from rotating.
2.
No material may
be added o or removed from the brush springs.
3.
Glue may not be
used under the spring to increase tension.
4.
Brush springs
cannot come in contact with the commutator at any
time.
Gearing
1.
Only STOCK Thunderjet or STOCK REPLACEMENT 14 tooth armature gears are
permitted, (comm. Available)
2.
Only STOCK Thunderjet or STOCK REPLACEMENT, including Model Motoring, 24 tooth brass idler and driven gears are
permitted, and any commercially available gear.
3.
Only STOCK Thunderjet or STOCK REPLACEMENT 9, 10, 11, 12, or 14 tooth
brass pinion gears are permitted.
4.
Only STOCK Thunderjet or STOCK REPLACEMENT 15 tooth crown gears are
permitted.
5.
The crown gear
boss may be trimmed to adjust for proper gear mesh.
6.
Gear tooth
friction surfaces may be de-burred by polishing, filing, or sanding.
7.
Beveling or removing
material from the gears is not permitted.
8.
SLIGHT rounding
of the edges due to polishing, filing, or sanding is acceptable.
9.
Gears may be
glued or soldered to the shafts.
10. Excessive glue or solder is not permitted.
Gearplate
1.
Only STOCK Aurora
Thunderjet and Tuff Ones gear plates are permitted.
2.
Any amount of the
vertical gear plate rails may be removed.
3.
No part of the
gear plate may be removed below the plane of the top.
4.
Removal of gear
post material is not permitted.
Gearplate Clamp
1.
A STOCK copper Thunderjet or STOCK REPLACEMENT gear plate clamp must be
used.
2.
The clamp may be
bent or dimpled.
Armatures
1.
Armatures must be
STOCK Aurora Thunderjet.
2.
Thunderjet armatures are one, or a combination of copper, red or
green colored wire on gray colored laminations.
3.
Minimum
resistance across any two commutator sections cannot
be lower than 16 OHMS at an average room temperature of 65 degrees to 75
degrees Fahrenheit.
4.
Re-wound
armatures are not permitted.
5.
De-wound
armatures are permitted.
6.
Commutators may be straightened and trued but must remain in the
stock position.
7.
No timing
changes.
8.
Armatures may be
balanced by adding epoxy, or by removing metal from the laminations only.
Controllers
1.
ANY controller is
permitted.