Kronos XTR Kronos XTR with stock electronics overheating? Is it true?

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Yeah, weird..I did find specs for the Torox 185 esc and such, but nothing on the motor temps..usually it would be right in the user/owners manual of the rc model itself but I haven't found it published from TC. Maybe it's infinity!?:p:ROFLMAO:
 
KnowAir said:
Yeah, weird..I did find specs for the Torox 185 esc and such, but nothing on the motor temps..usually it would be right in the user/owners manual of the rc model itself but I haven't found it published from TC. Maybe it's infinity!?:p:ROFLMAO:
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I don't think the tech is quite there yet for been able to withstand infinity temps! 🤣
I've just opened a support ticket asking them, I'll report back.
 
slick2500 said:
The battery temp is the only one that raises concern. 45C is where damages starts to happen to the cells.
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It seems like 45C on the battery is not so bad.

The Battery’s temperature is important. Use the following temperature ranges as guideline
a. Charge Temperature Range: 32°F - 110°F / 0°C - 43°C
b. Discharge Temperature Range: 32°F - 140°F / 0°C - 60°C
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Traxxas doc: https://traxxas.com/sites/default/files/KC2238-R00-LiPo-battery-fold-out-large.pdf
 
DaniC said:
It seems like 45C on the battery is not so bad.



Traxxas doc: https://traxxas.com/sites/default/files/KC2238-R00-LiPo-battery-fold-out-large.pdf
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Thanks for sharing that info. I am curious that so many users are critical about storage charging their batteries yet Traxxas doesn't even mention it in this literature? The Sypom batteries I recently bought of amazon state the batteries should be stored between 3.75 and 3.85v per cell, which is what I've been doing for the last year or so. Prior to that, I would just run to lvc and toss em in a bag till next time..
I don't really get into IR and all that, if the battery starts dropping out(lvc) while in use, then comes back up a moment later, it's toast and I toss em. I guess this is why I always buy the cheapest batteries that meet my needs, so I don't over think it..😁🍻
 
Reply from Corally on motor temps for the Kuron 825, pretty standard stuff.

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DaniC said:
Reply from Corally on motor temps for the Kuron 825, pretty standard stuff.

View attachment 2455
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Yup, a generic response, not surprised TBH. So around 160f.. I guess after going beyond 70C, you're on your own in other words..
I've gotten readings of 215f on motors that are still running today, AND I've had magnet wraps let go around 195f on others, soo..?

I dealt with Luke before to, always very polite.
 
KnowAir said:
Yup, a generic response, not surprised TBH. So around 160f.. I guess after going beyond 70C, you're on your own in other words..
I've gotten readings of 215f on motors that are still running today, AND I've had magnet wraps let go around 195f on others, soo..?

I dealt with Luke before to, always very polite.
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Yes it's like everything else, some things are of higher quality so some motors might be able to withstand higher temps.

I've dealt with Luke and Stefan, they're both great. Their customer service is excellent.


So to start wrapping things up on this thread, the XTR with the recommended TC electronics on 4S and the stock pinion runs very close to the max temperature limits on the motor. At a minimum, a good heatsink and fan is recommended.

Now what I would like to hear from others is what temperatures they get on the motor on this exact same configuration but on 6S?
 
DaniC said:
Yes it's like everything else, some things are of higher quality so some motors might be able to withstand higher temps.

I've dealt with Luke and Stefan, they're both great. Their customer service is excellent.


So to start wrapping things up on this thread, the XTR with the recommended TC electronics on 4S and the stock pinion runs very close to the max temperature limits on the motor. At a minimum, a good heatsink and fan is recommended.

Now what I would like to hear from others is what temperatures they get on the motor on this exact same configuration but on 6S?
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Oh yeah, right, I actually forgot to mention my personal experience with the TC equipped xtr🤪
So I got mine late last year,so fall temps (40-60f). No fans, 4s was seeing around 130f max. I did run 6s briefly this spring on same setup but don't recall the actual temps I was getting but not hot enough to concern me I guess..
I did install a couple 35mm fans recently in anticipation of running in 80-90f summer temps.
I'll take some picks of my setup if you promise not to laugh..JK. The fins of the motor are considered to be heatsinks, so I mounted my fans using M3x20 or 25mm screws with nuts and zip ties to maintain satisfactory distance from the motor for good airflow. Some real hillbilly looking crap TBH 🤣🤣
The jury is still out as to whether it'll be enough or not. The fans are Winsin dual bb 9k rpm from amazon at 5 for $15 so $6 invested thus far..
 
KnowAir said:
Oh yeah, right, I actually forgot to mention my personal experience with the TC equipped xtr🤪
So I got mine late last year,so fall temps (40-60f). No fans, 4s was seeing around 130f max. I did run 6s briefly this spring on same setup but don't recall the actual temps I was getting but not hot enough to concern me I guess..
I did install a couple 35mm fans recently in anticipation of running in 80-90f summer temps.
I'll take some picks of my setup if you promise not to laugh..JK. The fins of the motor are considered to be heatsinks, so I mounted my fans using M3x20 or 25mm screws with nuts and zip ties to maintain satisfactory distance from the motor for good airflow. Some real hillbilly looking crap TBH 🤣🤣
The jury is still out as to whether it'll be enough or not. The fans are Winsin dual bb 9k rpm from amazon at 5 for $15 so $6 invested thus far..
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I won't laugh, promise! 😬
 
Soo, here's my rendition of fancy like😁🤣🤣
Thinking of longer screws, couple more zip ties and I might submit it for rig of the month?😁🤣🤣

20220602_200157.webp


20220602_200207.webp


20220602_200313.webp
 
DaniC said:
Nice one! Actually a clever and resourceful way of mounting these fans!
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Thanks, just using what I had on hand. I bought the 35mm fans to replace some esc fans initially.. I have been flipping my esc fans every time I replace or take a shroud off of an esc, it's experimental. My theory is since heat rises, why are the fans installed blowing down, therefore sucking every bit of debris that lands on top of the shroud right into the fan? I haven't found any scientific evidence that blowing up is better than down but it seems like my fans ingest less debris blowing up vs down..Obviously appearance isn't important to me. I understand some take much pride in it, different strokes..🍻😎
 
KnowAir said:
Thanks, just using what I had on hand. I bought the 35mm fans to replace some esc fans initially.. I have been flipping my esc fans every time I replace or take a shroud off of an esc, it's experimental. My theory is since heat rises, why are the fans installed blowing down, therefore sucking every bit of debris that lands on top of the shroud right into the fan? I haven't found any scientific evidence that blowing up is better than down but it seems like my fans ingest less debris blowing up vs down..Obviously appearance isn't important to me. I understand some take much pride in it, different strokes..🍻😎
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It's a sound theory! Even if it's doing the same job in terms of cooling, you already win by keeping dust and debris out.
 
razorrc said:
It’s not the same. Stand in front of a fan at your house. Then stand behind it. Which one makes you feel cooler?
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I agree with your example, I don't think it works the same on a heat sink though. With a human body, there is a constant flow of moisture being secreted from our skin, with air directed onto our skin, we can feel the effect as the moisture is removed by the concentrated air flow. No such effect with a heat sink.. but there are so many variables that effect the heat transfer and which actually works best.
The most adverse effect on a heat sink's ability to perform is air flow restriction which when related to rc electronics would typically be leaves, grass and dirt buildup. If the airflow is equal, I don't see any reason to believe there would be any significant difference in the orientation of the fan(push/pull).

However, there is one thing that can make a difference that I can think of, and that is that the fan itself can only have a frame supporting it from one side.
So with rc's, the force being exerted on these fans when landing from jumps and such, the fan itself seems better suited(I think) to be supported from the underside. Which is the way the manufacturer's are installing them..
 
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The question of which direction a fan cools better is discussed for more than 30 years now already (not only in the RC world, even more in electronic forums for cooling CPUs) and the clear answer is: It depends! 😉

There are really many factors, but in general it seems that “sucking” can be more effective if you have an enclosed environment (like the fan in your computer or your battery charger which sucks the hot air out of the case) and “blowing” is better in an open environment like we have when cooling a motor (heatsink).

As you stated, the total airflow is the same on both sides of the fan, but in an open space at the sucking side the airflow is not as concentrated on a “spot” as it is on the blowing side.

On the other hand, in case of the ESC the “sucking” can be effective because the fan is more working within an enclosed area.

Beside all those temperature considerations, you are right - those fans are often supported only in one direction… so for RC applications the position can have an heavy impact on the lifetime of the fan, especially for offroad and jumping.
 
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DaniC said:
Yeah that was me chatting to him on YT comments. He was using those electronics on his Dementor and was having the same issues. My theory is that perhaps he got a dodgy motor from the start or perhaps at some point it overheated badly damaging it slightly, so now it overheats every time and this in turn makes the ESC work harder and that's why the ESC cuts off.
Anyway, I'll invite him here to the forum, maybe we'll get him to do 25 posts and enter the XTR giveaway!
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My torox 185 just decided to stop working. Red light blinking.. it will not except neutral position or throttle. But I can get into settings. Weard
 
I did read up on the subject a bit today myself, and it does depend on many variables as to which works better in a given application.
I have no reason or proof to claim reversing the esc fan orientation will provide any worthwhile benefit, which is why I deemed it experimental.
I don't notice any difference TBH, and have even broken a fan blade on my kaiju esc after flipping the fan. Can't say for sure that it broke because I flipped it as they do break anyway from time to time..but it doesn't seem to get as much debris stuck in the fan after flipping it, so IDK?🍻
 
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