Up until today I was blissfully ignorant of the potential problems of using SimonK flashed ESC on larger multicopters with high pole count low kV motors. Maybe others know about this, but I did not. I was browsing the forums and came across this:
I decided to try and reproduce this on my quad. I was shocked to find how easy it was to get the motor to briefly un-sync! Here is a video of me tilting the quad around in stabilize with only 1 motor connected:
Ironman 650 quad
Multistar 690 kV 22 pole motors
4S 5000 mAh battery
12X3.8 APC props
Afro 30A ESC's with the original firmware untouched
Genuine 3DR APM 2.5.2 with 3.1 firmware
Keep in mind I have been flying my quad for 6 months with no issues. Flys great, although I have not flown it in much more than 10 mph winds. This concerns me greatly though.
The motors go unsynced for only an instant and appear to always recover immediately. I *hope* this means it will not crash from this in flight.
My questions to anyone that may have more knowledge of this situation:
1. I read Marco say that the 2012-09-30 SimonK firmware worked better concerning this problem. Is there a change log anywhere of the different firmwares? Does anyone know what changes were made specifically that improve or worsen this issue?
2. Am I tempting fate by continuing to fly my quad like this?
3. What ESC, or firmware, should I run to avoid this?
Thank you! I am scheduled to do some aerial photography this weekend for a group and was ready to go until I read this... now I am nervous. Any insight is much appreciated.