# Quadcopter is unstable during first flight

**URL:** <https://discuss.px4.io/t/quadcopter-is-unstable-during-first-flight/37585>\
**Category:** PX4 Autopilot\
**Created:** [April 1, 2024, 5:08pm UTC](https://discuss.px4.io/t/quadcopter-is-unstable-during-first-flight/37585 "2024-04-01T17:08:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![huytd\_2910](https://discuss.px4.io/letter_avatar_proxy/v4/letter/h/77aa72/32.png) [@huytd\_2910](https://discuss.px4.io/u/huytd_2910)\
**Post date:** [April 1, 2024, 5:08pm UTC](https://discuss.px4.io/t/quadcopter-is-unstable-during-first-flight/37585/1 "2024-04-01T17:08:58Z")

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I built a quadcopter with 21 inch wings, software version v1.13.3, however the first time I took off, I found it seemed unstable. This is my log file, I need advice to fix this problem. thank you  
[https://review.px4.io/plot\_app?log=f69ef4b7-aec9-4ab6-abea-eb950840912b](https://review.px4.io/plot_app?log=f69ef4b7-aec9-4ab6-abea-eb950840912b)  
[https://review.px4.io/plot\_app?log=07a9b244-95be-4f9d-85ac-d2d5eeb85bbe](https://review.px4.io/plot_app?log=07a9b244-95be-4f9d-85ac-d2d5eeb85bbe)