Hey guys,
I have a peculiar problem and am trying to track down the cause of flight instability. I have a rather large Carbon Core X8 Octo powered by T-Motor 4014-330 through T-Motor T40A ESCs. Oh and turning 16" T-Motor Carbon props. Pixhawk flight controller too.
Initially when I took delivery from the builder, it flew horribly and we tracked the problem to a couple of things, first it was running the default PIDs and had not been tuned, the next thing I checked was that the ESCs all had different setting, 2 had braking on, different start modes, and timing was not consistent across all 8 ESCs.
Since then I’ve had the f/c professionally tuned, and the ESCs all programmed the same via a T-Motor Program Card I bought here at RobotShop.
Settings are as follows:
Brake: Off
Battery Type: Ni-xx
Cut Off Type: Cut-Off
Cut Off Voltage: Low
Start Mode: Normal
Timing Mode: Middle
Governor Mode: Off
All ESCs were programmed to these settings and it flies much better but periodically especially in low wind conditions will over/under correct. I’ve checked the log files and it appears that the F/C is sending the message to the ESC to correct but it’s just not executing it fast enough. Initially I suspected the larger props taking much longer to react but have witnessed X8s with much larger 27" props handle wind effortlessly.
Have I programmed the ESCs incorrectly? I was going to try and chase this problem down and see if I can correct with my next course of action would be to buy a different ESC.
Can anyone chime in? I’m pretty bummed and I am not getting any support from the vendor, according to him, it’s flying as intended.
Thanks in advance
RC