I had never heard of these motors but they have a cool secret! 

Totally wanna see the performance differences in solid silver wire

Let’s see a solid silver winding comparison!

So interestingly enough SunnySky was the first FPV hobby focused manufacturer to make silver plated windings. This had to have been back in 2015 or 2016. T-motor followed suit, and most of their pro-line motors have had silver plated windings since then. Back when the original RotorRiot Hypetrain motors were coming out I did a bunch of R&D testing of variants and I had the opportunity to test a couple of motors back to back with silver windings and without, along with several wire thicknesses. Some super interesting results. It showed about a 5% increase in performance in my testing over the non-plated wire, which is not insignificant. Another thing worth pointing out is the role of skin effect in this conversation. My testing also showed a similar outcome that you saw here where the gains were primarily in the upper part of the throttle curve. Rather than this being a result of higher Kv though, this is mostly due to the fact that the penetration depth of the current flow is inversely proportional to the frequency of the switching in alternating current. At low RPMs skin effect is playing a fairly insignificant role, but as throttle increases the current is more and more focused on the surface where the plating is providing an increasing percentage of conduction. I actually ran the formulas back when I was testing this and there's some interesting stuff related to the diameter of the wire and the thickness of the plating along with the PWM duty cycle at the FETs. There's also some interesting stuff related to this and multi-strand vs single strand windings for higher Kv and higher RPM applications.

Ask bardwell if he's selling his battery testing gear, doesn't seem to get much use these days 😅

oh man i cant wait to see your battery testing! bardwell should send you his tester that the community helped buy for him that he never really utilised in the way he said he would

Regarding battery testing. I would BB log a few freestyle flights and also get some top racer BB logs, and make a load test profile (thro and currents) and use it of course checking IR with something like Wayne Gills meter. Checking temp, capacity, voltage sag, etc. Also should look into some of the 6s 5000 testing mscguy is doing, he is the standard for the edf guys, he is in rcg, if you need help let me know. Since you program, I don't think you need to buy a cadex/etc tester, build your own. Thanks for sharing.

I really hope other FPV 'creators' promote your interest in testing battery packs. Please keep driving this!

Take Bardwells Battery tester that he bought years ago with the same aim and basically is not using... Im sure he'll be happy to collaborate ^^

Heck yes brother, i would love to see how a silver wound motor preforms!!!!!!!

Copper's electric conductivity is 58 MS/m at 20 °C, as for silver, it is 63 MS/m. about 3% difference per meter, I think there's more than one meter of copper in that stator. I would like to see the silver winding, I expect less than 5% difference. BTW, if you do the experiment, consider repeating the silver plated tests with a manually wound stator, I think that value should be compared to the solid silver wound stator.

A contribution towards the battery testing gear. Keep up the great work!

Thank you sir your info is gold happy to see someone start to straighten up the wild west of fpv Motors and batteries are ridiculous in this Hobby I come from car racing for like 40 years and it takes Someone Like You To keep motor and battery companies from putting out the garbage I constantly see in it fpv it was done in cars a more mature hobby and made so many changes that nowadays not even the cheapest Motors are that bad and all it took was people like you thank you for your time happy safe flying

If you make silver wire motor you should make copper one too to accurately compare diy vs diy motors Or even better you could 1. Buy 3 same motors 2. Do a bench test on all of them 3. Take off coils from 2 of them and leave one as is 4. Rewind 1 motor with same width copper wire 5. Rewind other motor with same width silver wire 6. Redo bench test on all 3 7. Compare results Would be interesting to see if performance changes if you rewind manually. Maybe if manual winding ir poor with a lot of air gaps, the motor would heat up faster on inside coils due to air insulation

Bring on battery testing!! Great videos Chris, I learn so much, thanks

Weren't my old Hypetrain motors using silver wire 5 years ago?

Should have compared it to the T-motor or Hypetrain silver wire motors. The T-motor calls it silver core not sure that means solid silver though might be a translation issue.

Fascinating indeed! Thanks, Chris!!! 😃 Stay safe there with your family! 🖖😊

Please rewind with silver cable. Please also test temperature resistance of the isolation. It should get better results, but temp stability of isolation could be worse.

Thank you, Chris Rosser

Great video! Short and concise.

Would love to see a video on rewiring a motor with silver thread instead of copper.

Keep up the great work Chris!

Didnt Joshua Bardwell do this exact same thing and get one of those machines only to test a few packs? I’d like to see this followed through but IM getting deja vu. I do like how you take the personal aspect out of rating these parts, I dont much crate how you feel about a motor or a battery I like knowing how it actually performs. Nice work Chris, thank you for putting this stuff out there.

Contribution towards the test gear! Thanks for all you do.

I'd love to see a comparison to a solid silver wire coil! Also I've seen the FlyFishRC motors becoming more popular(and available at more retailers), it'd be awesome if you could test those in the future as well!

I remember hearing your name years ago. I recently got back into the hobby. and am upgrading my gear... Nice to finally put a face to a name

Go for it Chris. Let see the silver winding motors.

Done by T-Motors YEARS ago...

i subscribed just so I can see how the silver wire would work vs the copper wire. Great video! will definitely be watching more

Excellent video! Yes, you doing battery testing would shake things up a little, but it's about time someone did. thanx

Batches of motors are like crops of wine. Cheers

I signed up for your Patreon. Would love to see battery testing, I agree that it is sorely needed.

I'm impressed by the efficiency of the Five33 headsup motor 2207 and wish there was a graph with the motors efficiency for the whole throttle curve. Thanks for the video

was using Tmotor f60 for a long time, but I now use RCinPower GTS 3 and they're awesome. I might just have to test these out

Excited about the battery testing. You should get the test setup from JB. His viewers paid for it and he did some testing but then called it quits.

Thanx for sharing,loved the presentation as usual :) would be an awesome experience to see the silver wired motor and test results.thanx again.! Just a thoughtand i dont know if you and Mr J Bardwell talk or get alonng ,might be quicker if you could borrow his or sommthing to that effect? Still be cool to own one if you where going to test thousands of batteries...glad im not paying for them hehe.and again thanx for the videos,wealth of knowledge i have learnt from you and others in the past year.God bless ya Chris!

I would love to see how silver wired motors perform. Maybe include a how-to for those of us curious to try as well? Thanks for the awesome content, Chris!

Maaan, we really need that battery tests, go for it! I just blew a CNHL battery mid flight and had to reassemble the whole quad because of it, that's ridiculous 👺

Would really like to see the battery test !

These motors definitely have my attention. Great video Chris. Do both the unibell and 2 piece use the silver plated coils?

Hahaha, my first thought instantly was, "why don't we have a solid silver winding?" 😅 Absolutely interested to see how that would affect the performance. Great video, Chris thanks! 😁👌🏻

You should google “skin effect”; consider high speed switching ~= AC for these circumstances; ~10% weight penalty for pure silver. Nice test and motor. Luv to see the pure silver test

Dear Chris, thank you for this piece. Very informative as usual and YES, please rewire one of the motors using pure silver. Very interesting. If results will be satisfying be ready for gold rewire requests 😊

Would love to see the silver winding motor! I also do some battery testing on my channel from time to time. I use a handful of different machines for my testing. I'd love to test the packs as you (or at least the same brands and models) so we can compare results!

When a mfg sends you motors for free, they would be stupid not to send you the cream of the crop (top 5% after dyno testing). So what you test and what we buy might be different.

Silver winding on the way yey. By you Chris of corse. Great vid info

Definitely want to see that.

Yessss silver test plz ZZ!

Thanks!

I would love to see a solid silver wire motor simply for getting that sweet test data and learning about motor winding in general.

after seeing the testing of these motors i took a chance on them and ordered 5 of the unibell 2040kvs for my tanq build. It is taking them 6 days to even ship them out, so that doesn't seem like a great sign right out of the gate...

I was wondering, would ceramic (or hybrid) bearings, vs normal ones, make a difference in flight times, or the gains of less friction in the bearings, would be minimal?

Rather than mainly some electrical conductivity advantage it may be more so an advantage in thermal properties

Great video as usual! I always wondered why almost all motors are wound with copper, it would be very interesting to see performance figures with solid silver windings. I wonder if you would be able to get the windings as compact as a machine could though?

Diatone use to add silver plating on the windings of their motors years ago.

Yes, please do the solid silver winding comparison….

It would absolutely be cool to see silver motors. but also, I would like to see a heat test with these motors to see if the extra cooling is really effective or if they're just good motors. If the cooing IS much better, what about gold wire? Obviously, it would be a HUGE weight gain but I think it would be interesting to look at temps if it turns out the material really makes a difference.

I’d love to see the performance improvement of the solid silver wire over the silver plated wire. No doubt it would minuscule, but every little improvement helps.

I would love to see a silver wire motor!

Totally wanna see the performance differences in solid silver wire!

Yeah would love to see you rewind a stator and see the benefits wouldnt be so bad with smaller motors. I bet its a pain though and fiddley be a good vid

gods work

Product idea - bells are disposable - a stator and bearings will outlive the bell 1:3. For 2207 you can pop on almost any bell and not tell the difference. It would be nice to see an extremely high quality 2207 1950 KV stator and bearing sold independently - maybe with silver lined wires. Also gold is a better conductor than silver.

i may not have dug back enough for your testing. what voltage on the motors is being used? what is the current draw across the torque curve?

Silver motor wires test, please!😁

Chris, ZT also have 2808 and 2812 motors, what are the applications for those

I think you know the answer here Chris. If you say you're up for it we're here to see the results. Bring on the silver motor.

@Chris Rosser - Bring on the Litz Wire hand wound motors

Yes, please do it

I've definitely separated the flux ring from the bell on a wasp major unibell

If the performance was shown to be high enough margin, I would consider buying a SOLID Silver wound motor, for at least my most shiny builds.

8:15 yes it all makes sense now !

how come yours are 2040kV, and the ones on the website for sale are only available at 2000kV?

what kv readings you got from bench test for those motors?

I want to see the silver wire motors!

Before you even mentioned it I was thinking I wonder how expensive an all silver winding motor would have to be? That would be a really interesting experiment! At current prices, probably $15-20 worth just in the cost of the silver, so maybe $55-60 per motor? Although you wouldn't get the benefits of mass production lowering the cost, so realistically maybe $80-100 per motor. Then you get into the issue of is suitable insulated silver wire even possible to buy or would you have to fabricate it yourself.

Solid silver motor :D

I didn't see any test including temperature. Is that not an issue for these motors?

Bedankt

What bearings are they using as I believe that is most important for long life.

Just curious, is it worth while to test the motor vibration profile as well? it is expected that every new motor delivered is balanced properly. However, I've noticed over the last year, that receiving a properly balanced motor out the box has become rare and I see no one talking about it at all. When that vibration is the biggest reason most quads fly like shit.

Wow! $41.40 for shipping? I hope that is direct DHL and not banana boat. Just bought 8 motors. 4 - 2207 and 4 -2306. Lets see how they perform.

Yes silver please. I Those numbers should be compelling. I dont know why I am here but I still want to see it.

Best 6s battery dogcom hands down

Do a silver wire motor i'd love to see how they perform

Danke!

Hi Chris -- I'll one-up you, let's test both pure Silver and pure Gold wire! Au has even better properties than Ag (for the reasons you identified) so let's "go big" and do both!!! 😄

5:08 you should adjust the scale of this graph it really does not convey the differences between them. They are essentially five colored bars of the same height.

Curious to see how silver wire motor would perform in this same scenario of tests. Is the gain in performance would be that significant? Or at this level, the gains would be marginal with diminishing returns for the cost?

I would like to see how they perform. thank you.

@chrisrosser how about solid gold wires???? isnt gold an even better conductor than silver?

I was going to order a set of these motors but no option to ship to the UK 😢 Would be very interested in the silver wire motor test 👍

Are they planning to add these motors to the website at some point?? They're not currently listed, only the two-piece 2207 in 2000kv, 1900kv, and then a few versions of the dad motor, which are all 2306.. 🧐

Greatly applaud your efforts with batteries .... too much is garbage.

Diatone did this a few years back on their BNF diatone GT

Silver for the win!

id like to see you use all these random motors in a durability test. [performance doesn't mean much in fpv if they cant take a hit.

Electron flow is mostly surface from what I understand, so silver plating would make sense in that respect. I'm a hobbyist and no engineer so testing out that theory wouild be key.

Hopefully other manufacturers try this out. Give us a xing 3 motor with this

What props did you use for the thrust tests?