RETRO F1-Indy Rules©
Effective January 1, 2017
Chassis- Are to be scratchbuilt from the listed materials or kits.
Allowed Materials are Brass in sheet, rod and tube forms. Bronze rod for
chassis main rails/rails. Steel in piano/music wire, pin tube(s). Steel guide
holders are allowed but can not exceed a max width of 1" ( 25.4 mm )
and be no longer than 1 1/2" ( 38.1 mm ) in length. No other materials
allowed in chassis construction.
Chassis are to be inline drive type. Motor shaft must be 90
degrees to the rear axle. No offset motors allowed. The motor shaft is to be on
the centerline of the chassis.
Floating pin tubes are allowed. Steel parts cut from Flexi type
chassis are not allowed.
Chassis must have a three sided and one piece rear motor
bracket with a minimum height of .200" in the areas between the motor
mount and bushing/bearing/tube areas . Bracket width is open. No cut and
soldered rear brackets allowed. The motor must be supported by the bracket and
the bracket extend to touch the rear axle bushings/bearings/tube(s). The
motor must be soldered or screwed to the bracket.
Keyed or Snap type chassis construction is not allowed. Chassis
Main Rails of round steel wire or round brass rod/tubing may be
ground/sanded a maximum of 20% of the wire diameter and must be ground/sanded
on the bottom side of the wire and chassis only. No flat or strip type rails
allowed. Chassis Main Rails must connect the front of the chassis to the rear
motor bracket. Pan type or one piece type chassis allowed. The bottom surface
of the chassis and motor must be straight and flat in all directions ( front to
rear and side to side ) with no sagging or drooping or bowing parts below the
chassis main rails. This will be checked with a straight edge ruler.
All hinged movements must be oriented in one and
the same direction excluding the drop arm. Shaker pans are allowed.
Centerline hinges are not allowed.
Maximum chassis width is 1 5/8" ( 41.28 mm )
Maximum wheelbase 4 1/4" ( 107.95 mm )
Minimum wheelbase 3 7/8" ( 98.425 mm )
Motor- The only allowed motor for F1-Indy is the
Sealed Pro Slot PS-4002-FK motor. All motors must run an 8 tooth pinion.
Pro-Slot 4002 FK Motor Rules
Motors must be factory sealed and using the unmodified factory seal only.
Seals may have clear "finger nail polish" added to extend life
of seal. NO other modifications to the seals allowed
All motors must run an 8 tooth pinion. At some events smaller
pinion may be allowed due to track length.
Racers may change brushes and springs.
Only 3 coil replacement springs are allowed.
Any 36-D sized motor brushes may be used.
Brushes may not be cut, slotted or modified on the surface touching
the commutator. Brushes may be radiused prior to break in.
No spring insulation or shunt wires are allowed.
Super Glue may be added to the endbell bushing.
Can oilite bushing may be soldered in place.
Armature Shafts may be cut on both sides of the motor.
Motors may NOT be refurbed.
NO OTHER MODIFICATIONS ALLOWED TO MOTOR.
Body- Any Approved Formula One or Indy Car body may be
used. Bodies must be 1969 or earlier models based on the actual full sized cars
of that era. Bodies may not be modified from their original molded factory
form. Max width of bodies are 1 5/8" excluding front wings. No
excessive cutting allowed. Rear of body may be cut out. Tape to reinforce
bodies is allowed.
Front Wing Maximum width is 2 7/8" ( 73.025 mm )
REAR BODY SKIRTS: There is no maximum limit to rear body skirts behind the rear
tires in Can-Am, World Sports Car (Coupe), Retro Anglewinder, and Formula
One/Indy. No material of any kind may be added on to the body to extend rear
body skirts. All rear body skirts must clear by .050 sitting on the tech block.
Bodies: Must have three numbers and be painted. Bodies may have
clear sides and no higher than 1/4" ( 6.35 mm ) measured from the
bottom of the body when mounted on the car. Windshields/windows must be clear
or tinted as on the full size car. Must not be able to see the chassis
through the body and body must be opaque except for the clear sides and
windshield areas or any other area ( air vents ) that was open on the full
size car. There is to be a minimum of 1/16" ( 1.59mm ) vertical front
area ( grill, bumper ) on the front of the body.
Chassis may not be visible outside the body when looking down
on the car/body.
Body interiors must be used. Must be formed and 3-D. No flat
interiors allowed. Must be painted a minimum of two colors. Must have driver,
helmet, arms, shoulders and steering wheel molded in. The cockpit area
must be cut out on the mold lines of the body.
Rear Body Height- Maximum of 1 3/8" ( 34.93 mm ) measured at
the highest point of the body at the rear of the body. This measurement is for
Lotus 49, Mc Laren M7C and M9 and Matra F1 bodies.
The maximum measurement for all other F 1 and Indy Car bodies is 1
1/8" ( 28.575 mm ) at the rear of the body.
Fronts- Minimum Diameter .750" ( 19.05 mm ). Minimum Width
.225" ( 5.72 mm ) No O-Ring fronts allowed. Must be two pieces a
wheel and a foam rubber tire. Foam rubber tire must be glued to the front
wheels. Front tire foam must be Black and made from natural, wonder or SBR type
rubber. No silicone material(s) allowed. Fronts may be coated with "super
glue" or finger nail polish. Contact patch must touch the entire track
surface. No angle cut or treading allowed. Tire edges may be rounded 1/16"
maximum radius.
Rears- Must be made using Natural Rubber tires only. Fish/Tuna (
treated or untreated ) and Wonder rubber is allowed. No Speed, silicone or
synthetic rubber allowed. Maximum rear tire width is .810" (
20.57 mm ) and the minimum rear tire diameter is .790" ( 20.066 mm ).
Rear tires may not be angle cut. Rear tire/wheel width may be narrowed.
NOTE* Some races may be run allowing a minimum rear tire dia
of .8125" ( 20.64 mm ).
Width- Maximum width of the front and rear track is 3 1/4"
( 82.55 mm ). Axles may not be wider than 3 1/4" and may not protrude
outside the outer wheel edge.
Front Clearance- Minimum is .015" ( 0.38 mm ).
Car/chassis is to be checked on a flat block with the front and rear tires
supporting the car/chassis without the guide and the most forward part of
the chassis will be measured for the minimum .015" clearance. No tape or
other materials are allowed anywhere on the bottom of the chassis.
Rear Clearance- Minimum is .040" ( 1.016 mm ).
Car/chassis is to be checked on a flat block with the front and rear
tires supporting the car/chassis without the guide. The motor
bracket and all wires, pans, etc must clear by this measurement from the aft
side of the motor. The crown gear must also clear by .040".
NOTE* Some races may be ran allowing a minimum rear clearance of
.050" ( 1.27 mm ).
Axles- Minimum diameter of 3/32" ( 2.38 mm ) allowed front
and rear. Axles must be solid steel and no hollow or lightweight material axles
allowed. Flattened axles are allowed. Threaded front axles allowed.
Bearings/Bushings- Ball Bearings or oilite
bushings allowed on front and rear axles and in front wheels.
Weight- Minimum ready to race car weight is 100 grams.
Gears- 48 pitch commercially available pinions and crown gears
only. Must use 7 tooth pinion only and crown gears are limited to 26, 27,
28 and 29. Gears may not be modified with the exception of a sleeve only. No
lightening of the plastic or metal gear hub. The plastic portion of 29T crown
gears may be sanded and/or machined to meet minimum clearance requirements. No
other modification of crown gears is permitted.
Guides- May use and commercially available guide flag. May use any
lead wire, guide clips and guide nut.
IF IT'S NOT MENTIONED IT'S NOT LEGAL ASK before
bringing it to the track or to tech.
Content on this website is Registered with the U.S. Copyright Office TXu 1-860-089 March 27, 2013 and/or by the RETRO Retro ElecTric Racing Organization as it is updated.