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Old 03-15-2005, 12:22 AM   #1
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Thumbs up BRUSHLESS MOTORS Now Legal At ROAR Races & The IFMAR Worlds!!!

At this year's ROAR Carpet Nationsls (in Connecticut) & at the IFMAR Off-Road Worlds (which will be held at the AF-Models Track in Collegno, Italy)..... BRUSHLESS MOTORS will now be allowed to run with & against Brushed Modified Motors! This was one of the Ammended Race Rules done during the January 2005 meeting of IFMAR and later followed by ROAR. According to guys at LRP, the ROAR Carpet Nationals will be the first major race of their new SPHERE ESC and the REEDY NEO-ONE Brushless Motor. Furthermore, I contacted AF-Models in Italy to confirm that Brushless Motors will be allowed to race with Brushed Motors (and not have their own class) during this year's IFMAR Off-Road Worlds and instantly got an e-mail back from Adriano (one of the Track's representatives) who acknowledged that there will be no separate Brushless Class at the Worlds and instead there would be only one class for Brushless & Brushed in both 2WD & 4wd! The BRUSHLESS Revolution is now definitely well underway!!!

For those interested, here are the specifications of the Brushless Rules from IFMAR:


General definition of a Brushless Motor:

a) Sensored or sensorless motors are allowed.

b) The motor has to be rebuildable. Ball bearings are allowed.

c) If the motor is sensored:

- It must use a six position JST ZH connector model number ZHR-6 or equivalent connector with 6 JST part number SZH-002T-P0.5 26-28 awg contacts or equivalent.

Wire sequence must be as follows:
Pin #1 - Black wire ground potential
Pin #2 - orange wire phase C
Pin #3 - white wire phase B
Pin #4 - green wire phase A
Pin #5 - blue wire temp control, 10 k Thermistor referenced to ground potential
Pin #6 - red wire + 5.0 volts d.c. +/- 10%.
Compatible speed control must use the 6 position JST header part number X-6B-ZR-SMX-TF (where the X denotes the style of the header), or equivalent.

- The power connector has to be clearly marked A, B, C.

A for phase A
B for phase B
C for phase C

d) `05` size specifications


Overall maximum diameter is 36.02mm measured at whatever point yields the maximum dimension, excluding solder tabs or lead wires. Overall minimum diameter is 34.00mm measured at whatever point yields the minimum dimension, excluding solder tabs or lead wires. Maximum length is 53.00mm measured from the mounting face of the motor to the furthest most point of the end bell, not including solder tabs, lead wires or original manufacturer’s logo or name. Minimum length is 50.00mm measured from the mounting face of the motor to the furthest most point of the end bell, not including solder tabs, lead wires or original manufacturer’s logo or name. Motor mounting holes must be on 1.00- inch (25.40mm) centres.


Stack minimum length 19.30mm, maximum 21.00mm. Stack inside diameter minimum 12.50mm, maximum 16.00mm. If a stack is used then it must be continuous. The laminations have to be one after the other without anything in between. The thickness of the stack plates is 0.35 +/- 0.05mm. All laminations must be of the same material.


Only three slot (phase) “Y” wound stators are permitted. No delta wound stators allowed. Only circular (round) pure copper wire permitted. No turn limit.


Shaft diameter must be 0.125 inches (3.175mm). Only one piece, two pole bonded Neodymium or Ferrite magnetic rotors are permitted. Magnet minimum length 23.00mm, maximum 27.00mm. Magnet minimum diameter 12.00mm, maximum 5.50mm.

e) All motors must have the original manufacturer’s logo or name moulded into the end bell.

f) A minimum of two thousand (2000) brushless motors must be available at the time of approval. A minimum of three hundred (300) brushless motors must have been sold to at least three (3) distributors or hobby shops or OEM’s at the time of submittal. The manufacturer has to provide an address of a hobby shop or the like, that any driver who wishes to obtain these motors at the time of the approval can do so. No hybrid (mixing of parts from approved brushless motors) allowed.

4.4.3 Reverse is not allowed -forward control only.

4.4.4 Only fixed single ratio transmissions allowed.

Last edited by STEALTH; 03-15-2005 at 12:35 AM.
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Old 03-15-2005, 12:31 AM   #2
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Old 03-16-2005, 07:27 AM   #3
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Now they just need to update the brushed motors rules to allow them to use the same technologies as the brushless motors ( ie- better magnets ) to have a level playing field. Big discussion about this on a lot of boards.

Also looks like the changes for brushed modified motors along these lines may take place for 2006.
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Old 03-17-2005, 10:16 PM   #4
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This definitely is Fantastic News ALL the way around!

Yes, for those who want to continue spending more on Brushes & Springs, Spend more time in the Pits cutting their Comm, or enjoy having less run-time as they wait for their motors to cool... I guess it would only be fair for them to try and enhance their outdated technology and milk whatever they can out of it instead of adapt and deal with what is no doubt the Future of Motors and ESCs in this hobby.

The arguments are all out there (especially on the On-Road Forum) and it's fine time IFMAR & ROAR saw the writing on the wall for the slow death of the Brushed Motor era. This should only help speed-up that process along.... Boy, I would hate to be Trinity who will have to eat and swallow their own crap when they realize their foolish mistake of publicly bashing Brushless Technology!
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