# Quadcopter takeoff unstable

**URL:** <https://discuss.px4.io/t/quadcopter-takeoff-unstable/13115>\
**Category:** Flight Testing & Log Analysis\
**Created:** [September 27, 2019, 11:25am UTC](https://discuss.px4.io/t/quadcopter-takeoff-unstable/13115 "2019-09-27T11:25:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![owner01](https://discuss.px4.io/letter_avatar_proxy/v4/letter/o/87869e/32.png) [@owner01](https://discuss.px4.io/u/owner01)\
**Post date:** [September 27, 2019, 11:25am UTC](https://discuss.px4.io/t/quadcopter-takeoff-unstable/13115/1 "2019-09-27T11:25:37Z")

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Hi,

I am trying to takeoff with my custom quadcopter but the behaviour is extremely unstable, it cannot takeoff without crashing, see the logs provided: [https://logs.px4.io/plot\_app?log=d5e277bc-b29e-4411-8b40-81366b5d859c](https://logs.px4.io/plot_app?log=d5e277bc-b29e-4411-8b40-81366b5d859c) what would be a good optimalistation that I can do in order to prevent this, adjust the PID control?