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Old 2009.03.19, 03:04 PM   #1
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Open disscusion 1/28 scale rules

There has been alot of buzz going on in 1/28th scale racing
the goal here is for all clubs to adopt a standard set of rules to use as a guideline
these rules, originally submitted to roar ,were modified by me and i did consult with CT and a few others on the 1/28th scale committee
i believe this is the way to start a national series where all manufactures will be able to compete against one another at the highest level of 1/28th scale
PLEASE HAVE AN OPEN MIND AND CONSIDER THIS... CUPS ALL HAVE RESTRICTIONS.... I WANT HEAD TO HEAD RACING
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Old 2009.03.19, 03:09 PM   #2
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1/28 Scale Touring 4WD/2WD STOCK Rules and Regulations

1/28 Scale Touring 4WD/2WD STOCK Rules and Regulations

Open 1/28th chassis Stock

Dimensional Specifications:
Item: Limit: Specification:

Length (B): max 180 mm

Width: max 80 mm

Height (C): min 35 mm

Wheelbase (A): max 102 mm
min 86 mm

Weight: min 2wd 175 g 4wd 175 g

Wheels: Diameter max 21.5 mm
Width max 12 mm rear 9 mm front
min 8.5 mm front or rear

Tires: Diameter max 27 mm
Width max 12 mm rear 9.5mm front
min 8.5 mm front or rear
Rear Wing (see below): Chord max 15 mm
Width max 80 mm

Tire type:

* Rubber Type only
* Capped tires are not allowed.

Traction compound: not allowed



Transmission: Single speed only.

suspension and drive:

* Single, one-piece drive axle allowed.(2wd)
* Independent suspension allowed.(2wd)
* Belt or Shaft Drive system is allowed(2wd/4wd)
* 4 Wheel independent suspension is allowed(4wd)

Body rules:

* Bodies must be modeled after real 2 or 4 door cars.
* No windows may be cut out except for small holes for clearance issues. Excessive material removal is not allowed.
* Only hard Plastic-Type Bodies allowed (i.e. Kyosho Autoscale, TRP Scale, Iwaver)

Wing rules:

* All rear wing that come with the body may be used and installed as per manufactures placement
*Custom wings allowed to use on the body
The rear edge of the wing or side dams may not extend beyond the rear of the body more than 10 mm AS IT MUST BE WITHIN MAXIMUM LENGTH
* No part of the wing may extend above the roofline of the body.

Battery cells:

* 4 cells maximum.
* Only AAA size NiMH rechargeable batteries rated at 1.25 volts or less may be used.

Electric motor rules:
*HANDOUT 70T MOTOR


Electronic Equipment Rules:


* Any combination of electronics, whether integrated (i.e. Kyosho type PCB) or independent is allowed.
* No limit for number of external or internal FET modifications to the electronic boards.
.

Racing Regulations:

* Race length will be 8 minutes for qualifiers
* Race length will be 10 minutes for mains
* 1 position will bump up to the next main
* Qualifying order can be decide by qual points or “rocket-run”, but must be announced by the race director prior to the start of the event.
* All 1/28th scale national events must use qual points and will be decided with the typical “Triple A-main” Format, unless otherwise discussed
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Old 2009.03.19, 03:10 PM   #3
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1/28 Scale Touring 2wd/4WD MOD Rules and Regulations

1/28 Scale Combined Touring 2wd/4WD MOD Rules and Regulations

1/28th Combined 2wd/4WD OPEN chassis Mod


Dimensional Specifications:
Item: Limit: Specification:
Length (B): max 180 mm
Width: max 80 mm
Height (C): min 35 mm
Wheelbase (A): max 102 mm
min 90 mm
Weight: min 2wd 175 g 4wd 175 g
Wheels: Diameter max 21.5 mm
min 18.5 mm
Width max 12 mm rear 9 mm front
min 8.5 mm front or rear
Tires: Diameter max 27 mm
Width max 12 mm rear 9.5mm front
min 8.5 mm front or rear
Rear Wing (see below): Chord max 15 mm
Width max 80 mm

Tire type:

* Rubber Type only
* Capped tires are not allowed.

Traction compound:not allowed





Transmission: Single speed only.

Suspension and drive:

* Single, one-piece drive axle allowed.(2wd)
* Independent suspension allowed.(2wd)
* Belt or Shaft Drive system is allowed(2wd/4wd)
* 4 Wheel independent suspension is allowed(4wd)

Body rules:

* Bodies must be modeled after real 2 or 4 door cars.
* No windows may be cut out except for small holes for clearance issues. Excessive material removal is not allowed.
* Only hard Plastic-Type Bodies allowed (i.e. Kyosho Autoscale, TRP Scale, Iwaver)

Wing rules:

* All rear wing that come with the body may be used and installed as per manufactures placement
*Custom wings allow to use on the body
The rear edge of the wing or side dams may not extend beyond the rear of the body more than 10 mm.
* No part of the wing may extend above the roofline of the body.

Battery cells:

* 4 cells maximum.
* Only AAA size NiMH rechargeable batteries rated at 1.25 volts or less may be used.

Electric motor rules:

* Only industry standard “130” size motors may be used.
* Overall maximum diameter: 20 mm measured at whatever point yields the maximum dimension.
* Maximum length: 28.5 mm measured from the mounting face of the motor to the furthest most point of the end bell, not including solder tabs or lead wires.

* Shaft diameter: 2 mm.
* Only three pole armatures are permitted.


* Modified motor rules:

o Use of Neo Magnets is permitted
o Motors may be hand wound in any pattern
o Bearings may be outfitted on the end-bell and can to race the motor shaft
o No brushless or core-less motors allowed

Electronic Equipment Rules:

* Any combination of electronics, whether integrated (i.e. Kyosho type PCB) or independent is allowed.
* No limit for number of external or internal FET modifications to the electronic boards.


Racing Regulations:

* Race length will be 8 minutes for qualifiers
* Race length will be 10 minutes for mains
* 1 position will bump up to the next main
* Qualifying order can be decide by qual points or “rocket-run”, but must be announced by the race director prior to the start of the event.
* All 1/28th scale national events must use qual points and will be decided with the typical “Triple A-main” Format, unless otherwise discussed
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Last edited by yasuji; 2009.05.29 at 02:05 AM.
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Old 2009.03.19, 03:11 PM   #4
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1/28 Scale Open Pan Car 2WD/4WD Rules and Regulations

1/28 Scale Open Pan Car 2WD/4WD Rules and Regulations
Open 1/28th 2WD/4WD chassis Stock/Mod

Dimensional Specifications:
Item: Limit: Specification:
Length (B): max 180 mm
Width: max 80 mm
Height (C): min 38 mm
Wheelbase (A): max 106 mm
min 94 mm
Weight: min 2wd 165 g 4wd 165 g

Wheels: Diameter max 22 mm
min 18.5 mm
Width max 16 mm rear 12 mm front
min 8.5 mm front or rear
Tires: Diameter max 28 mm
Width max 16 mm rear 12 mm front
min 8.5 mm front or rear
Rear Wing (see below): Chord max 15 mm
Width max 80 mm

Tire type:

* Rubber Type only
* Capped tires are not allowed.

Traction compound:
not allowed

Transmission: Single speed only.

Suspension and drive:

* Single, one-piece drive axle allowed.(2wd)
* Independent suspension allowed.(2wd)
* Belt or Shaft Drive system is allowed(2wd/4wd)
* 4 Wheel independent suspension is allowed (2wd/4wd)

Body rules:

* PANCAR/LEMANS STYLE BODIES ONLY
(i.e atomic,kyosho,pn racing or other hard plastic or lexan style bodies)
* No windows may be cut out
* Excessive material removal is not allowed.
* Lexan (polycarbonate) bodies or hard plastic “pan-car” bodies only

Wing rules:

* Only one wing is allowed per manufacture , fixed in the same location as produced
* The rear edge of the wing or side dams may not extend beyond the rear of the body more than 10 mm.

Battery cells:

* 4 cells maximum.
* Only AAA size NiMH rechargeable batteries rated at 1.25 volts or less may be used.

Electric motor rules:

* Only industry standard “130” size motors may be used.
* Overall maximum diameter: 20 mm measured at whatever point yields the maximum dimension.
* Maximum length: 28.5 mm measured from the mounting face of the motor to the furthest most point of the end bell, not including solder tabs or lead wires.
* Shaft diameter: 2 mm.
* Only three pole armatures are permitted.



* Stock motor rules:

HANDOUT MOTOR



* Modified motor rules:
ONLY INDUSTRY STANDARD "130" SIZE MOTORS
o Modified motors must conform to the general technical specifications for electric motors outlined above with the exception of:
o Use of Neo Magnets is permitted
o Motors may be hand wound in any pattern
o Bearings may be outfitted on the end-bell and can to race the motor shaft
o No brushless or core-less motors allowed

Electronic Equipment Rules:

* Any combination of electronics, whether integrated (i.e. Kyosho type PCB) or independent is allowed.
* No limit for number of external or internal FET modifications to the electronic boards.
* Only frequencies approved by Roar will be allowed.

Racing Regulations:

* Race length will be 8 minutes for qualifiers
* Race length will be 10 minutes for mains
* 1 position will bump up to the next main
* Qualifying order can be decide by qual points or “rocket-run”, but must be announced by the race director prior to the start of the event.
* All 1/28th scale national events must use qual points and will be decided with the typical “Triple A-main” Format, unless otherwise discussed
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Last edited by yasuji; 2009.05.29 at 02:16 AM.
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Old 2009.03.19, 03:29 PM   #5
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Pretty cool, and it all seems to work but I would hate to see the 102 wheelbase go the way of the Dodo. If anything, I think it should be allowed in the Open Pan class to go along with the prototype body theme.

Also... I wouldn't rule out an independent rear suspension for the 2WDs. I think it's bound to happen one day with the right chassis design. It would kind of be like saying only front kingpin suspensions are allowed.

This scale is constantly evolving, and I'm sure some nut will do a major re-configure of the standard chassis layouts one day soon.

Might want to address F1 Class too... they're not dead yet!
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Old 2009.03.19, 03:40 PM   #6
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Quote:
Originally Posted by imxlr8ed View Post
Pretty cool, and it all seems to work but I would hate to see the 102 wheelbase go the way of the Dodo. If anything, I think it should be allowed in the Mod class to go along with the prototype body theme.

Also... I wouldn't rule out an independent rear suspension for the 2WDs. I think it's bound to happen one day with the right chassis design. It would kind of be like saying only front kingpin suspensions are allowed.

This scale is constantly evolving, and I'm sure some nut will do a major re-configure of the standard layouts one day soon.

Might want to address F1 Class too... they're not dead yet!
GOOD POINTS....i will allow indepent suspension cause evolution is inevitable
as for f1 an lemans 102....they are NOT dead....the existing rules that each club has is sufficient they are NOT EXCLUDED
f1 is a f1 only class rules tbd
as well as lemans 102 class tbd by each club.....i think landons rules for thet class is good
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Last edited by yasuji; 2009.03.19 at 03:42 PM.
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Old 2009.03.19, 06:57 PM   #7
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I feel that the weight limits are a little high. My stock AWD weighs in at 172g (fully stock with bearings, body and batteries). If I want to run it that way, I have to add over 20g of weight to comply with the rules.

Even the 2wd weights, without trying to reduce weight, my 2wd stock car that I ran at the KO race was 75g. Of course, if I were to get into a collission with a heavier car, I would get the worse of it, but that should be the choice of the driver.

I feel that people that use mainly stock cars without adding a lot of alloy hop ups are penalised with the rules to compensate for the ones that like to use all the alloy parts. It should be an option up to the driver to be able to use a car that is stock without adding weight. Body choice is critical in racing, and people that want to run larger heavier, more stable bodies should do so with a weight penalty. Instead of the person that wants to use the smaller lighter body receiving the weight penalty. Then that person really gets no advantage, and is actually at a disadvantage.

This scale covers a lot of different wheelbases and widths, the smaller cars are more nimble due to weight and size, but they are also more vulnerable... That is a risk that the driver takes when they run those cars.

I personally feel that 175g for 2wd and 180g for AWD would be more suitable. These weights can be easily attained without having to cut weight from a stock car. Option parts will add weight, but also increase durability. Every race I have attended, I have had to add weight to make weight except for the KO race, where the weight limit was 170g. Sometimes more than 10g (as in the case for the PN events). My cars are light, but that is because a lot of times I choose not to use an alloy upgrade part that I know will just add weight. I also like smaller cars, that have light bodies...

I agree with Ed, that independant rear suspension should not be restricted for 2wd.
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Old 2009.03.19, 08:17 PM   #8
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Quote:
Originally Posted by EMU View Post

I personally feel that 175g for 2wd and 180g for AWD would be more suitable. These weights can be easily attained without having to cut weight from a stock car. Option parts will add weight, but also increase durability. Every race I have attended, I have had to add weight to make weight except for the KO race, where the weight limit was 170g. Sometimes more than 10g (as in the case for the PN events).
i agree on the weight limits........175 for 2wd stk
185 for 4wd stk and mod
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Old 2009.03.19, 08:21 PM   #9
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I guess 185g is more reasonable... I am using a very light body and do have to add some weight to balance the car. After I install the diffs and swingshafts, I should be right around 180g, then ~5g to balance the car...
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Old 2009.03.19, 08:26 PM   #10
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Quote:
Originally Posted by EMU View Post
I guess 185g is more reasonable... I am using a very light body and do have to add some weight to balance the car. After I install the diffs and swingshafts, I should be right around 180g, then ~5g to balance the car...
i think that any lighter may become a safety issue
also there will be guys complaining that it is too low.....
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Old 2009.03.19, 08:29 PM   #11
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Im digging this....

just a few questions/observations.
you say 1/28th scale the serpent pan car is 1/24 scale. does this fit in the dimensional tolerances of 1/28th???
There are a few other chassis out there as well. Are they dimensionally
1/28th scale?

I remember when they were being developed and possibly the popularity revolved around the glitching issues w the older am mini zs...and underfetted boards.
2.4 really turned our hobby around. I havent heard or seen many of the
component chassis for about a year now.
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Old 2009.03.19, 08:37 PM   #12
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i like the idea of control tires for the events like 10th sedan. weight limits and ride height are also nice.
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Old 2009.03.19, 08:46 PM   #13
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Quote:
Originally Posted by bermbuster View Post
Im digging this....

just a few questions/observations.
you say 1/28th scale the serpent pan car is 1/24 scale. does this fit in the dimensional tolerances of 1/28th???
There are a few other chassis out there as well. Are they dimensionally
1/28th scale?

I remember when they were being developed and possibly the popularity revolved around the glitching issues w the older am mini zs...and underfetted boards.
2.4 really turned our hobby around. I havent heard or seen many of the
component chassis for about a year now.
i do not feel that the serpent 1/24 car will fit in to this class ......and it has lipos and brushless....
if it could be scaled down to fit the dimensions and run a std 130 motor on aaa batteries...it could lhen and only then be considered



as for the others.....i believe that MRCG SINSTER INZANE PROZ VRC All fall into the proper dimentions.....
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Old 2009.03.19, 08:49 PM   #14
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Quote:
Originally Posted by dvsstrike View Post
i like the idea of control tires for the events like 10th sedan. weight limits and ride height are also nice.
if you cater to one company others will not want to come out and play....
so we will not be using a "spec"tire rule
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Old 2009.03.19, 10:26 PM   #15
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The Serpent is way too large, let alone the different motor/battery config... It is also designed for foams, and would probably run poorly with rubber tires.

I have run events where you have handout front tires... While it worked for me, since I already was using the tires, you have to change the entire setup of the car to work with the tires you are given. It will put people completely out of their element, trying to get a single type of tire to work on a track that they may not be well suited for. At events, sometimes I go through 5 different types of tires before I find something that I like on that specific track. I think that spec tires should be left for specific events, not as a national rule. You want to leave setup options for the drivers... as well as not single out one manufacturer, as the others will be hurt.
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