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My Chinese E-Scooter

The sky rc gps needs no sim card.
It connects via Bluetooth to the phone and the data is displyed and stored in the phone.
I still haven't tried to record anything, but meanwhile I found a quick way to solve my travel distance/range issue since the new controller increased the power consumption so much: I built a semi onboard charging system.

The idea here was to be able to remove the charger from the bike easily so I don't carry it with me whenever I don't need it. One thing I needed was a long cable, because when I park the scooter at work there's usually no place available around the power outlets because most of my coworkers charge their bikes there. I have to park far away, hence the need for a long wire. Sure I could go to work earlier and avoid all this trouble, but where's the fun in that.

Anyway, first thing I've done was to design an automatic cable winder, then 3d print it and assemble it. I used a few parts from a broken winder I had around. At first I wanted to purchase a new one instead of making my own, but they were surprizingly expensive and also I thought their design wasn't very sturdy.
Plus it made for a fun project, with interesting design challenges.

So, first the design:


Then the thing after I printed and assembled it:


I had to experiment a little to make the ratchet system work reliably, but it wasn't too difficult. Took me about three days from the start of the design to the finished product, 3D printing s really hard to beat speed wise.
The wire lenght is about 5 meters, which is more than what I need so it should be good.
Then it was time to install it in the scooter:


I decided to go for a standard home power outlet. This way I can plug any charger I want, and moreover I can just take the charger out of the bike to gain a few kg whenever I don't need it.


Now hopefully my range problem is sorted, I can go to work at full speed and charge it back up so I can also do the return trip at full speed. No need to compromize anymore.
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If it works out over time, will you publish the model?

FWIW, I took a reel out of an ancient vacuum cleaner to use for the trike's built in charger, but I have yet to get around to installing it on the trike. You may not have something like the thrift stores (old recycled items) we have here around your locality, but if you do you could check for such things there if you ever need one.
If it works out over time, will you publish the model?
Sure, but I'm not certain it'll be very useful because mine was designed around the parts I had around (mainly the sping and the rotary contacts).
Here is the step model, it is editable so you can adapt the design to the parts you already got.
I think it is possible to DIY the rotary contacts relatively easily, but it's a bit more difficult to find an appropriate spring.
Anyway, here are the 3D files.


  • Automatic Wire Winder.rar
    185 KB · Views: 1
I purchased this scooter back in 2014 and one of the first thing I've done was to change the original motor to a custom made QS2000W balanced one. This motor is now 10 years old and survived through pretty much everything I threw at it, eventually being fed 22KW over the past year.
I thought it would die for sure, but it survived for all these years without complaining. But now it is time for it to peacefully retire and sit on a shelf for a while until I get another use for it.

The reason for that is that I built another motor!
For a long time, I got a 6KW 55H stator lying around in the shop, a friend left it there years ago and I completely forgot about it. Then recently, this friend blew up his 3KW 50H motor. At first I thought it would be a good candidate for a custom rewinding job,but then I got curious to see if I could frankenstein something, using the 55H stator with the 50H rotor.

So I tried it and it worked very well!

Nothing rubs inside, it was pretty much the same as fitting any normal stator.
Now it a has significantly more starting torque, it can easily power wheely until 50km/h or so, the acceleration is violent. And this is achieved despite having a much larger diameter tire (which I'll need to change for a smaller one, because it messes up a bit the balance, the scooter now leans a little bit too much towards the front which isn't great for riding).
I think it will be crazy once I'll fit a smaller tire, but the big tire does look pretty nice. Also I'd like to fit a temp sensor in there, to see if I can keep increasing the power even further.

So far I smoked everything I raced against, including Teslas, Porsches and a CBR600. The top speed is still the same at around 120km/h, which is more than enough, it wouldn't be reasonable to go faster with this frame. Also it seems like this motor is a little more efficient, as power consumption isn't as crazy as it used to be. Now I can do my daily round trip in one battery charge at full speed.



What a fun litle thing, it's so nice and fun to ride, it's impossible not to smile when you twist the throttle.
Power wheely at 50km/h :bigthumb:
What was the 2000W motors magnet size and phase wire ?
The new motor will run a lot cooler now.
Power wheely at 50km/h :bigthumb:
What was the 2000W motors magnet size and phase wire ?
The new motor will run a lot cooler now.
I think it was 50H, no idea about the windings tho. When I purchased it I told the guy at QS that I was intending to use this motor for competition/racing, so I asked if he could try and give me the best possible stuff. No idea if he did actually follow my request, but one thing for sure is that it was not their worst motor, given how it survived all these years.

We won't be able to know how much cooler it runs, because I never had a temp sensor in the 2KW. But for sure it will run cooler. :p
That is a bad-ass scooter :devilish:. I'm surprise/glad to hear that you've also noticed improved efficiency.