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Old Aug 07, 2014, 02:55 PM
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Joined Aug 2014
1 Posts
My quadcopter's motors spin out of sync - why? (Turnigy AE-30A ESCs)

edit 2: Problem solved! From the KK board's SAFE menu, go into Misc. Settings and from there change the minimum throttle value. Mine was 3 by default. When I increased it incrementally, at 16 the motors finally started up simultaneously. Credit goes to Craftydan of flitetest.com forums (thread http://forum.flitetest.com/showthrea...d=1#post122803)

edit: Hi everyone! I'm new here and... it's not terribly obvious to me how to change the post tag from "Discussion" to "Help!" ...sorry, I'm working on it/reading FAQs. Also, please let me know if there's a more appropriate subforum to post this question in. Thank you!

I’ve been building a quadcopter and the motors do not spin at the same time when I increase the throttle.

I’m using a KK 2.1.5 board with default firmware. I’m using Turnigy AE-30A brushless ESCs from HobbyKing.

I have my quadcopter in a + configuration, where I would consider motor 1 to be at 12 o’clock, motor 2 at 3 o’ clock, motor 3 at 6 o’ clock and motor 4 at 9 o’ clock.

When I increase throttle, motors 1 and 3 start spinning at nearly the same time (when I am 3 or 4 notches above zero throttle, respectively). SEVERAL notches of throttle later, motors 2 and 4 start to go, also at different times than each other (I’m talking around 12 notches later than motors 1 and 3, a pretty significant difference). 

I don’t believe it’s a problem of the ESCs or motors because when I try to plug ANY of the ESCs into the M1 output of the KK board (the very top-right set of 3 pins you plug the white/red/black wires from the ESC into), the motor will always spin given the same amount of throttle – about 3 notches above zero throttle.

I have calibrated by ESCs several times, both simultaneously and one-by-one. I tried calibrating with and without trims and got the same failed result. My Turnigy programming card does not seem to be compatible with these ESCs. The process I followed was:

1. Put throttle on tx to maximum

2. Turned tx on

3. Held down KK board buttons 1 and 4

4. Powered KK board with lipo battery and entered throttle pass-through mode

5. Brought throttle to zero and heard confirmation tone (I know my throttle channel is not reversed)

6. Set each ESC’s settings (Turnigy AE-30a)

7. After setup, unplugged battery


Then I would arm the KK board, increase throttle and see that the motors are all out of sync.

I understand that with the KK board you’re supposed to turn it on with your tx at max throttle, wait for a confirmation tone, then turn the throttle back down to zero to calibrate the throttle end points. However, this ESC Turnigy AE-30a enters programming mode when you turn it on with max throttle on the tx! How else can you calibrate throttle end points with the KK 2.1.5?

I’ve documented the parts I’ve used, my building process up to now, and just about anything else you might want to know about my troubleshooting attempts. If you have any questions that might help with figuring out this issue, don’t hesitate to ask and I’ll spill whatever you need.

Thank you so much for your time and take care!
jc17 is offline Find More Posts by jc17
Last edited by jc17; Aug 08, 2014 at 10:15 AM. Reason: PROBLEM SOLVED!
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