The ROAR vs Trinity thing My Words

The ROAR vs Trinity thing

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In the two last weeks, I’ve read many things about the ROAR decision to disapprove the Trinity D3.5 motor. Before going further, I must tell you that I’m not an expert in motors design, and specifications. I’m just a guy who connects the motor and enjoys every moments with my buggy. I don’t even use Trinity motors and I don’t participate to ROAR sanctioned events. In fact, I race 1/10 offroad on a 1/8 scale track and our number one rule is “Bring your 1/10 and have fun”.


To make things simple and clear because this is how I love things. ROAR is the organization that approves different R/C products so when you go to a ROAR sanctioned event, your equipment must be ROAR approved. This is to make things fair to everyone.

Here’s how I understand how things work. Every time a manufacturer releases a new motor, the ROAR guys test the motor, if the motor passes the tech inspection, the motor is ROAR approved. So the racers who want to race in a ROAR sanctioned event can buy this motor because it is ROAR approved.

When Trinity released their D3.5 motor, ROAR has approved the motor and then everybody was happy. Unfortunately for Trinity, ROAR rechecked different models and the Trinity D3.5 did not pass the spec test due to larger wire diameter.

So, how a previously approved motor can become black listed? From my understanding, the wire used inside the motor is now larger in diameter than what it was previously when ROAR has approved the motor. Why did it change? It seems that ROAR has decided to use new testing equipment and that’s why the popular Trinity has failed the test. Did the wire manufacturer has changed something in the wire production? Did Trinity know about this? If the first batch of Trinity D3.5 motors have a “ROAR legal” wire, how could we determine if your motor bought several months ago is legal or not?

Meanwhile, there is a little internet fight between ROAR and Trinity. The folks at ROAR say they have received complaints about the motor and this is why they rechecked it. On another hand, Trinity says nothing has changed and ROAR has some interest conflict and uses new testing-equipment.

With all that being said, I would not put the blame on anyone. Time will tell who is wrong and who is right. But for now, this situation is definitively not good for Trinity, frustrating for the racers who have bought the D3.5 motor and the most important, not good at all for our sport/hobby.

Here are some great articles from LiveRC about the “The ROAR vs Trinity thing”


Here’s the letter from Trinity to ROAR





Sylvain Lafrance

Hello, my name is Sylvain Lafrance and I am the man behind I have bought my first hobby grade RC in the early 90s. With years, what that started as a simple hobby, quickly became a strong passion. I am so much passionate about R/C that I have created in 2006 to share my experiences with R/C products that I use for racing and bashing. Follow me !

This Post Has 3 Comments

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    They re-checked the same motor and found it to be a different size than previously thought. This is due to newer more precise equipment designed to check the size without physical contact. I’ve never heard these facts disputed before now.

  2. Avatar

    I don’t know, this one is a tough call. 20AWG wire is actually defined as being 0.0320″ nominal diameter. That equates to 0.8128mm. Standard tolerances for AWG wire are +/- 3%, which in the case of 20AWG wire is exactly +/- 0.024384mm (3% of 0.8128). When you take the widely accepted industry standard tolerance into consideration (3%), the range then becomes 0.788416mm through 0.837184mm for 20AWG +/- 3% wire. ROAR is stating that the wire they tested in the Epic D3.5 motors is measuring0.8417mm, which is clearly out of the generally accepted range for quality 20AWG drawn copper wire. In fact, they are going as far as stating that all of the wire that they have tested has measured above 0.8400mm, which is above the standard tolerance for 20AWG copper wire. However, they do not state what the tolerance actually should be for 20AWG wire in ROAR approved motors. For example, if +/- 5% 20AWG wire is acceptable, then the wire in question would actually be considered “in-tolerance”.

    I have to say that ROAR is totally full of it on it’s ruling. If they are going to re-test one motor with new testing equipment that was not available when they did their initial testing, then they are obligated to re-test every single motor with the new testing equipment. If they are not intending to do that, then they are clearly not fit to be a ruling authority at all, and it would actually serve to highlight what a joke they have become.

    In addition, when they made their written statement, they made the mistake of stating, “So, the maximum of .813mm listed in the ROAR Rulebook DOES account for a tolerance, which is from the real specification of approximately .805mm, up to the nominal specification of .813mm”. Wow! Where did that information come from?? That is one of the most wildly outrageous lines of BS I’ve ever had the privilege of reading! 20AWG wire is literally defined as being 0.0320″ diameter, which is exactly 0.8128mm. That is the nominal size, not some arbitrary number of 0.805mm that ROAR pulled out of their a** because it helped them make their point. ROAR should have done their homework and found out what the industry accepted tolerance range was for 20AWG wire, and then made their statement that they found motors that were using wire of a larger diameter than what is accepted industry wide as 20AWG wire. Instead, they made up some BS about how 20AWG wire is actually supposed to be .805mm nominal with a maximum diameter of 0.813. I would like to see where they can point out that information in any engineering handbook. That information is just plain wrong! Somebody at ROAR should be fired for making an official statement with bad information being presented as though it were factual. What a joke, ROAR!

    Anyway, I know this was a very long-winded response, but hopefully it helps shed some light on what I believe is just a ridiculous situation. I honestly feel bad for Trinity. So they happened to use a 5% tolerance wire (no doubt sourced from China) instead of the imaginary 0% tolerance wire which ROAR wants you believe actually exists. Does anybody seriously think that increasing the wire diameter from the ROAR-spec 0.813mm to 0.8417mm would make any real-world difference at all? The difference in the cross-sectional area is 0.09mm^2. That’s less than a tenth of a square millimeter. It is absolutely negligible for the application that we are talking about (Remote Operated Auto Racing).

    It’s no wonder the hobby is suffering so badly. ROAR is making ridiculous rules that it can’t even enforce. Then, when it finally has the proper equipment to enforce it, it singles out a lone manufacturer and makes a wildly popular motor illegal overnight. How can a motor be legal one day and illegal the next? I think we would all like an answer to that question, ROAR! Thousands of people now own motors that they cannot legally use in ROAR sponsored events … but for some reason they could a week ago. I thought ROAR was supposed to help protect the consumer, not screw them. Not to mention the fact that Trinity would have never went into full-production on the motors in the first place if ROAR had made the decision that they were not to ROAR standard when they initially tested the motors. They would have fixed the problem, then re-submitted the motor for approval, and only then would they have gone into production. So, not only has ROAR screwed the consumer, but they have also screwed an honest company that was simply trying to sell a competitive product that was approved by ROAR in the first place! It is a no-brainer who would win that lawsuit.

    That’s my thoughts on the subject. Congratulations if you were able to actually read through that entire post without falling asleep or vomiting!

  3. Avatar

    Funny how you should post this today, since it’s like deja vu that it’s happening to them again…

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