# Coaxial Octocopter crash during PID tuing

**URL:** <https://discuss.px4.io/t/coaxial-octocopter-crash-during-pid-tuing/38885>\
**Category:** Flight Testing & Log Analysis\
**Created:** [May 23, 2024, 3:59pm UTC](https://discuss.px4.io/t/coaxial-octocopter-crash-during-pid-tuing/38885 "2024-05-23T15:59:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tarbaig](https://discuss.px4.io/letter_avatar_proxy/v4/letter/t/58f4c7/32.png) [@tarbaig](https://discuss.px4.io/u/tarbaig)\
**Post date:** [May 23, 2024, 3:59pm UTC](https://discuss.px4.io/t/coaxial-octocopter-crash-during-pid-tuing/38885/1 "2024-05-23T15:59:36Z")

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Hi,  
I tired to manually PID tune my coaxial Octocopter. Autotuning had lead to a crash and some damage before, so I hoped I could be more careful by doing it by hand.

Unfortunately I crashed again and now I am a bit reluctant to fly, before I figured out what is the Issue.

I am using a ca. 70cm coaxial octocopter with a pixhawk 6c. Total weigth of the aircraft is 4kg, the weight distribution is a bit bottom heavy due to the large battery.

Flight data can be seen here:  
[https://logs.px4.io/plot\_app?plots=pid\_analysis&log=057f1ca8-2d86-4f41-9ded-bd069de2634e](https://logs.px4.io/plot_app?plots=pid_analysis&log=057f1ca8-2d86-4f41-9ded-bd069de2634e)

Any help is appreciated.