HolyBro x500 V2 with Pixhawk 6C flight in stabilize mode

Hello,

I have setup my x500 drone following this 3 video series: HolyBro x500 V2 setup
I armed it and everything worked except it had no gps fix because I was indoors. I could not go outside but I wanted to try and make it hover. So I proceeded anyway. Arming was successful and the motors began spinning properly. However, when I increased the throttle it just would not fly. I was being a little extra careful because I was indoors, however, I moved my throttle to over halfway up and still there was no lift off. The spin speed increased significantly, but the drone was still on the ground.
Tomorrow I will try it outside and go to max throttle if needed but I just wanted to check if this was ok. I would have guessed that it would begin to hover at around half throttle.
Please let me know if there are any potential issues that might be causing this or if it is normal to have to go to such a high throttle.

The necessary throttle input mainly depends on the available power range (thrust) of your motors, the weight of your drone and the settings of your FC system.
It is nice to give us a link to some video tutorials but this isn’t really helpfull.
To give you a really good answer to your question a good knowledge of your system and your settings is necessary!

1 Like

Which flight mode are you in? Check your flight log RC.out PWM values of all the motors.
Are you using digital or analog ESC?

It could be the same issue I faced before.

@Juergen-Fahlbusch @Jai.GAY
Hello,
I am using digital ESCs. I checked the logs for two of my attempts and here are the mean and max values: The first two rows are the mean and max values for trial 1 respectively, and the last two rows are the mean and max values for trial 2 respectively.
During the first attempt, the drone’s left side of the drone lifted meaning motors 1 and 4 were on the ground while 2 and 3 began to lift.
During the second attempt, the back of the drone lifted meaning motors 2 and 4 were on the ground while 1 and 3 began to lift.

Motor 1 Motor 2 Motor 3 Motor 4
1113.03 1116.39 1153.39 1126.94
1508 1510 1722 1742
1125.63 1109.93 112.6 1101.52
1505 1446 1494 1422

Please help me with this.

Once again, give us all information about your setup .
As I don’t know exactly the HolyBro x500 V2

  • which Motors and ESCs
  • which FC Firmware used
  • log.bin file of your trial
  • PARAMs

@Juergen-Fahlbusch
Hello,
Here is the information:

Motors: Holybro 2216 KV920 Motor with XT30 Plug
ESCs: BLHeli S ESC 20A with XT30 Plugs
Log file for trial 1: 2024-10-26 14-02-39.bin (900 KB)
Log file for trial 2: 2024-11-01 6-00-00 PM.bin (672 KB)
PARAMs: PARAMs.param (17.6 KB)

I got it to work!
I changed the following parameters:

Initally they were MOT_THST_EXPO = 0.54 and INS_GYRO_FILTER = 0.48
I changed these to MOT_THST_EXPO = 0.65 and INS_GYRO_FILTER = 0.30

This is off by a factor of 140. The correct value for this parameter for a 10” prop craft is 42

1 Like

In the log you posted INS_GYRO_FILTER is 46. What size props are you using?

@Allister @dkemxr
Sorry, I accidentally wrote 0.48 and 0.30 instead of 46 and 30. Yes I am using 10’’ propellers. It flies now, so I don’t think I need to change it again. I might try it later.