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Hello guys.

Today i got the package from the postal office:

Spoiler

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And the motors feel quite nice.. I installed "Giri -The RPM Checker" on my phone and did a small test on the motors (all 4).

On my lego battery box that outputs 8.8 volts with the 6 x new duracell batteries i (8.54 volts, with one motor running without stalling)

The application managed to show me a constant rpm on each motor:

1211.2 / 1130.5 rpm outer
1534.2 / 1615 rpm inner

 

The test was inserting an 8L axle with some tape on the end and running it agains the phone microphone, the higher value was achieved without actualy hitting the phone with the tape, and the lower one was while the tape was hitting the case of the phone.

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Here is the link to the store i bought the buggy motors: http://s.click.aliexpress.com/e/bMCP2U1E

After few checks i saw that the motors appears on more stores now... at different prices...

I ordered from this store before and i know that the seller is serious (you could see the actually packaging there... without the box)

This week i will look for a Dynamometer Spring to try to measure the torque :D.

I tried to keep my post "slim", but if you want more photos/videos with specific actions, please ask and i will try to provide as i can.

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No problem if you share more vids and images. 

The rpm is close togehter with the original. 

Thanks for doing this and I am looking forward.

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I'm still far from getting mine. At least I can say that my seller is not very reliable. I got a tracking number the last day before order being automatically cancelled and I'm not even sure there's something on my way.

Time will tell.

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1 hour ago, fosamax said:

I'm still far from getting mine. At least I can say that my seller is not very reliable. I got a tracking number the last day before order being automatically cancelled and I'm not even sure there's something on my way.

Time will tell.

https://www.17track.net/en

https://global.cainiao.com/

mostly all of my tracking is done here

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Yeah. I'm just stuck at "Inbound in sorting center"  for now more than one week.

Order has been made on 22 of june so it's definitelively not blazzingly fast shipping. That being said, most of my stuff ordered from aliexpress have been delivered one day...

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1 hour ago, fosamax said:

Yeah. I'm just stuck at "Inbound in sorting center"  for now more than one week.

Order has been made on 22 of june so it's definitelively not blazzingly fast shipping. That being said, most of my stuff ordered from aliexpress have been delivered one day...

Mine was 22 days => 3 days with china courier, 11 days from china to Sweden, 8 days within my country... without working weekends

I tried some videos method of measuring torque:

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https://bricksafe.com/files/clawp1995/buggy-motor/ezgif-2-decb744a67ce.mp4

I used a 12L axle, now i don't know if the "arms length" is from the center or not... from the center till the end of the axle there are 9.8cm and the motors pushes 190-210 grams.

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According to Sariel's data in "The Unofficial Lego Technic Builders Guide" page 170, RPMs for the RC "buggy" motor are as follows: 

No load at 7 Volt power supply is inner /906 RPMs  and outer is 670 RPMs.

No load at 9 volt power supply is inner 1245 RPMs and outer 920 RPMs.

Philo's " Lego Motors Chart" shows 832 RPMs for the inner and 615 RPMs for the outer. 

Maybe it really doesn't matter how fast these Chinese motors go.  They can be geared up or down for any application.

What's nice is that they are available for less than what a used Lego one costs and they are Power Functions compatible. Maybe we'll be able to use these when TLG comes out with a conversion cable for PU.

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