15" quadcopter crash in wind

ArduCopter Copter 4.0
1

Hi guys,

I would really appreciate your help diagnosing the cause of my quad’s crash.
My .bin file and .tlog file are attached.
https://drive.google.com/file/d/1X57Mn77mg1lnofwr-xRqK3fzLq4yQF5R/view?usp=sharing
2021-02-26 17-39-46.tlog (306.9 KB)

My quad was autotuned 10+ flights ago, and I had not encountered any errors. The quad had been flying decently during this particular flight at low altitudes (<10 meters). Then I increased my height exposing the quad to ~6 m/s wind. A few seconds later, the quad lost attitude control.

For reference, I was running a 15" quadcopter running:

  • T-Motor 4012 + Tarot 15" props (I know these aren’t great props…)
  • APD 40F3 ESCs
  • Tarot 680 Pro frame
  • Cube Orange
  • Here 3 GPS (single, using its compass as compass1)
  • Tattu 6S 6000 mAh
  • Raspberry Pi Companion Computer (inactive during crash)
  • RFD 900 TXMod

Thank you

2

First you have a terrible Yaw bias on that craft. Perhaps from twisted arms.

Yaw
Yaw3360×1009 230 KB

And I’m not sure if you had thrust loss or some outputs were just driven to max from the Yaw demand.

Yaw
Yaw3296×1008 244 KB

Also, your Rate filters look low for a 15" craft and you don’t have Voltage thrust scaling set.