Hexa crash at maiden flight

ArduCopter Copter 4.0
1

Hi,
I am new to ardupilot , I sincerely apologize if my the errors are very basic.
I would be grateful if anyone could help me analyse the reason for the crash.
I also realize of making a mistake for flying in the house parking area .

Are the following reasons for the crash of the hexa? or/and I am missing some from the analysis?

  1. Vibrations are more than 30.
  2. Due to sudden drop of voltage , Bat failsafe triggered RTL and hexa toppled over the attic.
  3. EKF variance, & EKF Primary changed.
    • NKF1 , NKF6 & NK11 are not showing similar curve for pitch and roll respectively.
      Can anyone share what could be the reason for not having similar curve, Why EKF are showing different estimation. But All the 3 IMU are having same curve.

Why was Motor interlock enabled for some duration and disabled?

I have attached some graph, Link to video of the crash & Link of the Log file.
[Log]
Log : (https://drive.google.com/file/d/1U4Hf9W9AzqzSML2pftKYQiJ68lr-kHI1/view?usp=sharing)

[Video]
Log: (https://drive.google.com/file/d/1gPzIGaYG3vfYlM9tj_t4928Q730ydIL-/view?usp=sharing)

NKF PITCH NOT MATCHING
NKF PITCH NOT MATCHING2560×1530 266 KB
NKF ROLL NOT MATCHING
NKF ROLL NOT MATCHING2560×1524 265 KB
VIBE XYZ CLIPPING
VIBE XYZ CLIPPING2271×1359 233 KB

Thank you :slightly_smiling_face:,

2

Can you give us more details as to your build?

The video really doesn’t show anything other than you taking off

Also the .log doesn’t really help. We need the .bin file

3

Hi Dave ,

Build details
Hexacopter, S550 Airframe,
Prop : 1045
Emax 2216 II 810Kv motor, Hobby wing xrotor 40A esc
Pixhawk cube black , here gps
Power1 : Mauch Hs100Lv powermodule , Power 2: powerbrick mini from the stock .
Battery : Tattu 2700mah 3s
Telemetry : RFD900+
Radio : Taranis x9D plus

Log Bin file

Thank you :slightly_smiling_face:,

4

Something is def wrong with the way the system is logging. Unless you just had the props spinning on the ground for 20 mins.

image
image868×508 16.4 KB

Your Barometer doesn’t even really change either

image
image1841×507 29.6 KB

You do have a huge battery voltage drop…

image
image1834×463 15.1 KB

At the same time as a huge current spike

image
image1871×492 16 KB

I do see you voltage alarm being triggered.

What was going on for these 20 mins?

5

I didn’t arm and keep the drone for 20 mins

6

Hi Dave,
I had a plan of performing another test flight just hovering in stabalize mode at 2-3feet . After 9hrs . Am I not supposed to fly .
Thank you