Car Specs
C-Can Motor Specifications
A. General
1. Motors must be commercially available, as defined in General Rules, Section IX, and must be specifically approved
for the GP-12 class on an "as-submitted" basis. Approved motors are listed in the GP-12 Approved Components listing.
2. Can and endbell must be mass-produced, of full-dimensioned can type (full top, bottom, and two sides, without cheater
tabs or other artificial attempts to meet the dimensional specifications) without modification. No aluminum endbells allowed.
Inside can dimensions are defined as not less than:
Length - 0.925 inches (23.50 mm)
Width - 0.835 inches (21.21 mm)
Height - 0.560 inches (14.22 mm)
3. Aftermarket components which are not identical replacements of original parts as approved are not allowed. This means
endbells, hardware, cans, etc. must be original for that brand and type of motor, with the following exceptions:
a) Approved single-piece magnets may be interchanged. Any magnet approved for use in any manufacturer’s motor may
be used in any other manufacturer’s setups.
b) Manufacturers selling super magnets, or other components above the cost of original equipment replacement parts, are
not allowed. A super magnet at higher cost and identical in appearance may not be detectable in a car, hence manufacturers
selling identical-looking components at higher cost will lose approval for their motor (this would not rule out "matched"
pairs of approved magnets).
4. Any motor retailing for US $44.53 or less may be used as long as it meets all GP-12 specs
and rules. Price only applies to Amateur Wing-Car motors.
B. Magnets
1. Magnet dimensions plus or minus 10% are as follows:
a) Length: 0.500 inches (12.70 mm)
b) Width: 0.150 inches (3.81 mm)
c) Height: 0.550 inches (13.97 mm)
2. Magnets must be commercially available through major distributors.
3. No quad magnets allowed. Magnets must be single-piece ceramic only.
4. Magnets may not contain "rare earth" materials (defined as elements with atomic weights 58 through 71).
C. Can Modifications
Anything not listed here is illegal.
1a. Ball bearings are allowed on can end only.
1. Can bushing or bearing may be soldered in place but may not be reversed or moved from original position except as stated
in below.
2. Diameter of bushing locator hole may be altered to allow the stock size bushing to be centered.
3. Outside diameter of bushing (excluding flange) may not be altered.
4. See table for adhesive rules. Need not retain magnet clips.
5. Magnet zapping is permitted.
6. Only single, one-piece magnets. No quad or multiple piece magnets allowed.
7. Motor brushes and springs may be replaced and spring tension may be adjusted. See table for spring rules.
8. A 1/8 inch (3.18 mm) notch may be cut in the can to allow for axle clearance.
9. Prohibited Modifications:
a) Cut outs or machine work on can or endbell.
b) See table for shunt wire rules.
c) Adding endbell heat sinks.
d) Drilling holes in can or endbell.
e) Armatures and magnets may be intermixed between approved manufacturers. Spec-15 motors must use the original can, endbell,
and hardware. See table for mixing of other parts.
f) No post-factory honing, shimming, or polishing of magnets allowed unless delivered by the manufacturer in this manner.
See table for further info.
10. Definition of can shall not include surface treatment. If a manufacturer introduces a plated can they need not go through
the submission process again. Plated can must sell for the same price as unplated version.
| |
Scale |
Expert Wing |
Amateur Wing |
Spec-15 |
|
Magnet Adhesive |
No Restriction |
Clear cyanoacrylates or epoxy |
Clear cyanoacrylates or epoxy |
Clear cyanoacrylates |
|
Unrestricted honing of magnets by racers |
Yes |
Yes |
Yes |
No |
|
Air Gap |
No Restriction |
No Restriction |
No restriction |
.528 minimum |
|
Interchangeable endbells and hardware |
Yes |
Yes |
No |
No |
|
Shunt wires and spring insulation |
No |
Yes |
No |
No |
|
Can end ball bearing |
yes |
yes |
yes |
No |
|
Brush Springs |
3 coil |
No Restriction |
3 coil |
3 coil |
Motors Stock 16-D
Must be commercially-available, meet all USRA manufacturing specs, and be approved for use in this class by the USRA. A
minimum number of 500 pieces is required for approval, and must be available through distributors and or raceways by Oct.
1 prior to the National Event.
Stock 16-D style set-ups only. Must be commercially-available. Setup must retail for US$10.62 or less. Setups sold with
aluminum spring cups retailing for US$11.66 or less may compete.
1b. Mid South is allowing the Camen D can set up.
2. No modifications allowed except as follows:
a) Racer may add can screws
b) May add spacers to limit end play.
c) May dye armature.
d) May re-true commutator.
e) May zap magnets.
Allow any type of adhesive to glue in magnets to D cans
g) May change brushes and may use any three-coil springs.
h) No polishing of magnets allowed.
i) No shimming or honing of magnets.
j) Balancing is allowed.
k) Armature may reconditioned; coating may be removed.
l) Minimum air gap is 0.575 inches (14.61 mm).
m) May interchange parts between manufacturer’s set-ups.
n) Oilite / Bearingmay be soldered in place.
o) May solder hoods to brush plates.
3. Cans (D-Cans)
a) Must be made from metal, and have no cut-outs or metal removed from sides of can. The only allowable cut-outs are the
axle notches. Only one hole is allowed on the top and bottom of can. No strap-type cans allowed. Cans must have a full top
and bottom. No cheater tabs on cans allowed.
b) Must meet the following minimum inside dimensions:
Height: 0.600 inches (15.24 mm)
Width: 0.875 inches (22.23 mm)
Length: 0.950 inches (24.13 mm)
c) Definition of can shall not include surface treatment. If a manufacturer introduces a plated can they need not go through
the submission process again. Plated can must sell for the same price as the unplated version.
4. Magnets (16-D)
Must be stock one piece single (no quads) ceramic magnets as found in the production motor, and meet the following minimum
dimensions:
Height: 0.570 inches (14.48 mm)
Length: 0.650 inches (16.51 mm)
Thickness: 0.145 inches (3.68 mm)
5. Armatures (16-D)
Must be commercially available, meet all USRA manufacturing specs, and be approved for use in this class by the USRA.
a) Must meet the following minimum dimensions:
Diameter: 0.513 inches (13.03 mm) excluding coating
Stack Length: 0.600 inches (15.24 mm)
No split-stack/lamination arms allowed.
b) Must be wound with 70 series-wound turns of AWG #30 gauge wire (0.0099–0.0101 inches excluding insulation) per
pole.
c) May be balanced.
d) May have factory-applied commutator tie wrap.
e) May be dyed and commutator may be re-trued.
Must be tagged 16-D.
Car Specifications - Scale Division
Busch- Non points race
This class is intended to be a fun class, where beginners and experienced racers can run together. Those designated
as beginners will receive points for the series and those more experienced racers will be driving for the fun of it!
Chassis: JK Cheetah 7 0.030" only (no aluminum pan)
JK Cheetah 11
JK Cheetah 0.030" only (no aluminum pan)
Champion (no aluminum pan)
Parma Flexi 5
Parma Flexi 4
Parma Flexi 2
Parma Flexi 1 (No light pan)
Mossetti Titan (No aluminum pan)
All other USRA chassis rules apply
Body: Any 4" Stockcar body
Front Bumper minimum – 1/8"
Rear Spoiler height maximum – 1 ¾"
Motor: Falcon 5 or later versions.
Gear Restrictions: Pinion gear must not be greater than 12 in 64 Pitch or 9 in 48 Pitch
Group 10 Stock Car
A. Chassis
1. Must be a commercially-available approved chassis.
2.a Must be stamped and formed metal. The portions to which the motor is attached must be steel. Floating pans may be steel,
aluminum, or brass.
b. chassis may have a maximum of three chassis parts consisting of one solid center section and maximum of two separate
pans. No additional pans or two piece center sections allowed.
3. May update chassis to RTR specs. May use lightweight replacement pans, and center sections.
4. May interchange parts from a single manufacturers; such as Flexi and Flexi-2 parts, JK long or short center sections,
and heavy or light pans on
JK Chassis.
5. No modifications except for the following:
a) May solder or glue motor, axle oilites, and front wheel retainers.
b) May add lead weight and tape to chassis.
c) May file holes in motor bracket to allow better gear mesh, but must retain a portion of motor bracket.
d) No oilite modifications allowed. May use offset oilites.
e) May add spacers between pan and center section.
f) May add a one-inch long motor brace and an upright brace.
g) The original manufacturers plating may be removed in the area to be soldered only.
h) May add pin tubes. Pin tubes may be either solid or floating. May add lead wire retainer.
i) May solder on steel guide tongue reinforcement such as Slick 7 but the original tongue may not be removed, modified,
or moved.
j) No other-modifications, soldering, cutting grinding or bracing allowed.
k) May use any guide, nut, spacers, lead wire and clips.
B. Motors Stock 16-D- See 16-D Specs above
C. BODIES-(Mid South)
1. Any commercially available 4 " Stock Car body may be used.
NOTE: Bodies MUST be mounted to chassis as follows. Front
wheel wells must be alligned to allow 100% of both of the front wheels TO BE be visible through the wheel wells.
2. Body may not be moved back or forward on chassis. Tires must be located in proper positions. Front wheel wells
must be left clear. Complete wheel and tire must be visible when viewed from side.
3. Must use Parma #809 interior, or similar 1/24 scale interior. no paper!! Must be painted and mounted in normal
position and cover entire interior.
4. Must have three decal or painted numbers placed on body, one on each door and one on the roof.
5. All windows must be clear.
6. Tech Director reserves the right to allow or disallow any cars or bodies and his decision is final.
