Brushless motor sizes and numbering explained.

[helicopter]

Its really so simple. Apart from the physical size specification and shaft diameter, all that manufacturers need to state is how much Torque, at what RPM and how much electrical Power is been consumed. The rest can be calculated mathematically. I have never understood the purpose behind the kV ratings which indicate motor RPM versus applied voltage, as they are meaningless entities without a known load been applied. Just specify the motors Torque, RPM and Power consumption, and the job is done. The physical motor size is not always indicative of how much work it can do. One day we may see this happen, and most of the questions as to what motor does what will no longer be asked !

[SpeedSyko]

You wouldn’t believe me if I told you, I’ve custom fabed insane blue printed motors for drag bikes and motorcycle stunt bikes professional drag racing, also built million dollar sport cars, this is the first time I took the time to figure out what the sizes of Rc motors since 1982! I just eye ball it and go. I so appreciate you breaking it down. I have over a hundred rc motors laying around and a caliper right next to them. I just measured one and yup 56118 is 56mm thick, 118 long!
How I build hundred of rc’s with never checking and it works, is beyond me. Dont tell anyone I didn’t know this. 🤣🤘👊🙏🏆

[RCRoads]

Great job. I finally got some answers I was searching for. Mainly motor can size. Most vendors list the shaft size but not the can size. Mainly the diameter. I just measured the OD of a 380 brushed motor and it is 24mm. So now I can simply look for a 2435 brushless motor. It would be nice if vendors included the dimensions of their motors in their descriptions. Again thanks for this valuable information.

[Willybrordus]

Thanks for explaining!
Greetings from Antwerp!

[BrothrBob]

Thankx Teacher, I learned a few things about what the numbers mean & took notes, lol Now i know.

[mikeharlow]

Thank you so much for clearing the muddy waters for me!

[temosgarage]

What kit (ESC and motor) do you recommend for upgrading the Traxxas dual brushed motor to brushless? Dont want anything crazy, just a little more speed.

[MetrologyEngineer]

Awesome video! I instantly had to subscribe!

[jamesconklin]

What kv size is best for a 1/10 Rlaarlo omni terminator for off road heavy bashing? It's pretty heavy because i upgraded a lot of stuff on it.
Tyia!.

[bharris]

Thank you. I was always told that the 540 was an indicator of the amount of seconds that it was expected to run - this was back in the 80's. I had a Kyosho with a LeMans 240ST. It certainly was longer that 24mm, so I still have a bit of confusion regarding that.

[NBC_NCO]

Ok great...
What about something like a 130 or 180 brushed motor and I want to go brushless.

Is the part to be measured across the" face" the smallest point or largest point ?

[ebenwaterman]

Thanx for explaining this so well. I'm just getting into this with an empty 40" boat. It's gonna be set up as a 1/6 scale (21 ft.) craft. I don't think I want a 1/6 scale motor. I'm not needing any mind bending speeds out of this thing, just need to be able to get on plane and then a little more. You know, ...scale. Any suggestions on where to start with motors etc. :)

[benjaminwest]

I am looking for a motor the size of the 3rd one you went over but I don’t want anything faster than 2000kv and I don’t want to spend more than $40-$50. Any good recommendations on what to get. Please let me know. I’m putting them in an Exceed rc 1/8 6x6 and I want a little more tire speed but I don’t want to loose the torque so I want a bigger motor.

[nuworldman]

John, you cleared up the size. What about the Kv, voltage, power, etc. Thanks

[oikiakaeidi]

Should I go brushless 3000kv, 50A esc and run it on nimh 7, 2volts, 3Ah for 1/10 4×4???? please help me because i can't find something useful anywhere!!!

[Th_Genius]

To the point and comprehensive. Thank you.

[jamesd]

Is there something special about the vintage Kyosho DM20 brushed motor? It was used in their motorcycles, 1:18 F1 cars and other vehicles. I think it was considered a 280 motor, curious what the brushless motor equivalent would be.

[Airbrushkid]

How about the Castle Creation 2028 motor? What's the 2028 prefer to?

[rc_dude]

Vey nice explanation. Appreciate your effort. Thanks.

[black_baron_net]

☠BLACK BARON☠ Wow, so many sizes and tech specs. A real challenge for RC scale helicopter beginners and non-beginners. Which one to choose without having any "feeling" for the bird. yet.