Hexacopter is not stable

ArduCopter
1

Hello, completely new to Pixhawk 2.4.8 and I tried to build a hexacopter with these equipments:

Pixhawk 2.4.8 Flight Controller
35 A BlHeli_s ESC
DYS 750 kV motors
1145 propellers
s550 frame
Mitoot M8N 8M GPS
3s 25C Lipo Battery

Already did all of the mandatory setups using mission planner, including the initial parameters

The Hexacopter struggles to take off, I have to input about 75% of my thrust and it takes off very low, when I try to move it, its very hard to control, when I try to input a movement, my copter wobbles in the air making it unstable. The movements are like doing a circular motion when I try to move the copter. The copter sometimes tries to move to the side during take off, double-checked the orientations and all is good including the propellers.

I also have a few questions in mind

  1. Do I need to tune the PIDs?
  2. Does the type of battery really affect my flight?
2

You can fix your issues and ask your questions to an ArduPilot trained AI here:

Follow the instructions there to fix this and get answers.

  1. yes you need to tune the PIDs like described above.
  2. yes, it does. Use “ecalc multirotor” software to calculate your flight times.
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3

Thank you, regarding about the battery, does my battery affect the thrust capacity also and not just flight time?

4

The battery voltage does. 3S, 4S, etc. And it’s weight obviously.

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5

so for example, 4s battery is going to be more suited to my build rather than 3s?

6

Yes, if the components can support it.
Use eCalc to check out the build.

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7

thank you so much, I literally built this copter just yesterday using pixhawk and Im kinda lost

8

Read the stuff i posted to get less lost.

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9

hello, I read the stuff last night and unexpectedly two of my hardwares (pixhawk 2.4.8 and motor) are included to the hardwares I should avoid, but I’ll still try to make it fly. Thank you.

10

hello so i tried to fly my hexacopter, even adjusted PID with the help of videos from youtube, my concern is that now before it even takes off, it tends to fly to one side causing it to land on its side, what could be the problem?

11

You should not see some random video about pid tuning and follow it. Your vehicle is not correctly configured yet

You should configure it correctly following the software and instructions posted. Ask questions if some step is unclear.

After that, if you’re unhappy, follow all YouTube videos you want.

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12

You need to calibrate the accelerometer and make sure the weight is balanced, both are explained in the software

1 Like
13

Thank you. One more thing, should I remove the stand for the meantime or should I leave it there?

Also, sometimes when I connect my pixhawk to my laptop and go to the compass section after flight, it always says my configuration changed and there is a “missing” compass

14

I also already did all of the mandatory tuning in the mission planner, calibrated accelerometer and level, calibrated the escs, and finally the initial tuning parameters, I was able to take off its just that if I don’t control it when throttling, it will most likely tip on its side

15

Post the files generated by the ardupilot methodic configurator and I will have a look at what you did wrong.

1 Like
16

Ill try to recalibrate again, is it okai to skip IMU configuration?

17

You mean IMU temperature calibration?

Yes, it is optional, but do try to understand the implications of it.

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