How does motor temperature affect performance? T-Motor Velox V3 Review 

Chris is the FPV messiah

New camera, lights and thermal cam? This new setup looks really nice and much more pro-youtuber like. Love it! The results is also quite surprising - didn't expect the effect of motor temperature to be fully negligible. My xnova motors run quite hot but I never felt this has any effect - and it seems I wasn't wrong - but now I'm a lot less worried!

Thanks for getting around to this. I was very curious about this. I knew the results would be negligible but wondered if they would be noticeable. Thanks again Chris.

Thanks a bunch for all the testing and comparison, Chris! 😊 Stay safe there with your family! 🖖😊

good to see these cheap motors perform really well but why isn't really anyone testing/reviewing xnovas motors? would like to see them tested but they perform really well in real flight performance. keep making these awesome vids tho, love watching them :)

This is such a detailed and well-structured review, I absolutely love it! One minor remark: it would be nice if you would explain how to read the graphs for every test. Explain what is shown on each axis and explain what the shape of the curve means. I am a scientist myself (molecular biologist) and in my experience it is much appreciated when you take people by the hand and walk them through the graphs. Makes it easier to follow and gives leaves more brain capacity for thinking about the results.

Oh man the question I wanted an answer to! I thought there'd be at least some loss of thrust at high temperatures but I guess that's one fewer thing to worry about.

It's pretty straightforward. Resistance rises with temperature which increases the I^2 x R loss.

Wow. Thanks again, Chris.

@Chris Rosser, why not mount it on a peltier and run an active cooling/heating test?

Excellent video

Thanks Chris!

I don’t think that you should combine motor review with fundamental questions like does temperature effect performance The question will be relevant for long as we use motors but review will get outdated fast Maybe it should be 2 separately videos In long term it would be interesting to have playlist of short 1-5min videos of similar fundamental questions, but if they're combined with reviews they won't be as relevant in a future Also great video learned some stuff thanks

@ChrisRosser Can you please do a revised version of your motor response and dyno tests across different firmware versions, in particular BlueJay 0.16 , 0.19.2, get in touch with the team for a build of the latest dev branch for your ESC, and ESCape32 for 32bit

Great vid thanks so much. I would love a video comparing the best motors for Long Range and discussing Motor size and KV to that extent.

Hi Chris, love ur vids. Which motor would you recommend for your 5.5 AOS v1.2? 2208 or 2506? I would love to find something like 2407, but it's not rly avaliable :(

If I recall well Gal Kremer has measured the 2207 to be actually 22,5 x 7,5 mm in size. So quite a big volume compared to a "pure" 2207. Hence the weight, perhaps.

Thank for this great find i am about to build chimera7 v2 with 7.5 inch propeller please recommend motor for that my more focus is towards flight time

I'd like to see the new emax rsiii motors on the test stand, although I am a little disappointed they are multi wire wrapped, wonder how well the windings will take the induction over time, i really liked my old rsii motors

9:24 How would you adjust this in Betaflight? If the throttle increases linearly, does that mean, that the rpm also increases linearly (or is it dependent on the load)? And does the "motor output limit" in Betaflight only limit rpm or power or thrust?

Would like to see how the T-Motor F60 Pro V 2020kV compares to it. So how much the higher tear have in common with the lower tear from this brand.

I've rewound motors, have mismatched stator and bell, and mismatched motors all together. Dinged up, glued back together bells after two years of use on Emax eco II. Quad works just fine. Tons of noise, but it's MY QUAD!

I didnt even know I was interested in this :)

What about higher temperatures though? If you pushed a motor too hard, closer to the enamel melting point?

I've been using Xing motors for a couple years now and for freestyle, durability and price? Xing all day long baby.

Help me in choosing one- 2207 1950 kv or 2306 1950 kv this is for my first fpv build (225 mm frame - approx weight- 680 gms with gopro)

You are amazing .

Question for a future test, does excessive heat in the motors/magnets cause the magnets to lose some of their effectiveness permanently?

Hi Chris ! I discovered 2275 skystars 1950 kv motors and I feel em performing amazingly comapreable to rcinpower. Very fast acceleration and low throttle , instant breaking . May be you can test them . Considering the price … :) twice cheaper . And it’s 7,5 height . Pulls a lot

A 45a esc supports this 2306 1950kv motor?

Can you test different bearings?

Is the motor dynamically balanced or statically? If it was balanced by a machine to keep it's balance and the balance does not change or automatically adjust in any way after the balance is made with the mud then it's static right? Similar to to a car tire. The way I heard what you said made me question it. I thought is there is some magic dynamic balancing that occurs in this motor? LOL. I'm amusing this was just a mistake but you can confirm.

Bonjour, avec quelle helice avait vous fait les test 😮. Toujours de super test très bien expliqués, merci et bravo.

What are the lightest 2306 motors?

Brother I need help Please! i have a 3.5 in quad that was working perfect until i crashed it and broke a motor. i replaced the motor but now the quad acts like i have the motor output limited to 10% . it will arm and it followes the sticks like rocking it back and forth or side to side with the sticks. i have checked everything. all is set right. but no mater how much throttle i give it it is not enough to take off from the ground. i have re flashed everything and tried older versions. checked the esc's in blhelisuit. nothing makes any difference. Do you have any idea where to start> have you ever seen this before? Please help! By the way i build quads for the public so i know what im doing. but this one has me stumped. im to the point of just randomly changing parts. i thought maybe the new motor was weak and the Fc was dumbing down the other motors to match the week one so i took it off and it still does it. it never tries to freak out or anything all seems correct.

I’d love to see similar testing for those of us who opt for 4S batteries due to price sensitivity.

no zt innovate motors on the test?

down to -114C metal-air fuel cell, with KOH ethanol electrolyte, like iron-air, 2kWh/kg specific energy

Honestly i hate to say it but i have concerns about the temperature data and your testing method, it seems unlikely to me there was so little effect on performance. Are you possibly using an esc or test bench with some kind of constant voltage/voltage compensation or thermal compensation settings/feature on a controller somewhere that is enabled? Both Nd magnets and coil winding material DO have well documented loss of performance from thermal effects, at 4:10 you show thrust vs power all looking suspiciously similar despite a 93c difference in operating temperature. NdFeB magnets have ~0.11% loss in Br/c (remanence) which immediately puts you at a 10.23% loss of motor output. The thermal effect on copper winding (assuming pure copper and not CCAW) will have an even larger effect on performance, at -18c the resistivity is 1.423×10^(-8) Ω m and then at 75c it would be 1.991×10^-8 Ω m which corresponds to a 28.5% increase in electrical resistance and associated voltage drop. Considering the physical properties of these materials which cannot be avoided regardless of motor type or configuration i can only assume a flawed testing method and hope you might go back and reassess the techniques you are using for data collection. Would be great to hear your thoughts on this.

i just want to know if the motor can take a beating. non of the other info actually matters,

Unibell isnt necessarily more durable...just heavier. Good 2 part motors take more hits to the concrete

Could you please consider to analyse also "real" motors (under 200KV) that are for things other than toying with drones, or is this an explicit quadcopter-channel ? You analysis is remarkable, but useless for grown-ups... I simply can´t stand seeing so much knowledge and work going to waste. Just a reminder, brushless motors are used everywhere nowadays, just not such like those here, of course... Those motors are just an unsignificant niche, although I like quadrocopters (still nothing a grown-up should waste too much time with, except it´s for research&prevention of climatic/natural catastrophies). At best I liked yout silver-wire-episode, despite having no happy-end... ;-)