# Sudden vibration introduced - casing "fly aways"

**URL:** <https://discuss.px4.io/t/sudden-vibration-introduced-casing-fly-aways/19523>\
**Category:** Flight Testing & Log Analysis\
**Created:** [November 10, 2020, 1:12pm UTC](https://discuss.px4.io/t/sudden-vibration-introduced-casing-fly-aways/19523 "2020-11-10T13:12:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![uk9069](https://discuss.px4.io/letter_avatar_proxy/v4/letter/u/8edcca/32.png) [@uk9069](https://discuss.px4.io/u/uk9069)\
**Post date:** [November 10, 2020, 1:12pm UTC](https://discuss.px4.io/t/sudden-vibration-introduced-casing-fly-aways/19523/1 "2020-11-10T13:12:03Z")

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Hello fellow fliers. I would like kindly ask you to check my flight log. My issues are sudden fly aways, either in manual or automatic mode. All I can denote from the logs is, that at the point when fly away starts, quite high spike of vibration is introduced (@6:40) into frame . I am collecting ideas for improvement, before next airborne. Besides that, I am not satisfied with Acceleration Power Spectral Density profile, Actuator Controls FTT, GPS Jamming indicator, max speed (?)… Drone hovers & flies very steady. My HW setup is: S500 frame, NXP FMU-K66 on the halved kitchen sponge attached to a stock carbon plate with dumpers, Keesin 9450 carbon propellers, ESCs: 3 x ReadyToSky 40A OPTO, 1 x Rockamp Akia 40A / 2-4S Lipo / 3A BEC. BEC cable plugged into FMU (I shall remove BEC cable, but forgot to), no landing gear attached, 5200 mAh 3S LiPo… Thank you experts.

> **[Flight Review](https://review.px4.io/plot_app?log=ec338b5d-c332-4dd5-b203-1944ed846fa4)**

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**Author:** ![jimdgit](https://discuss.px4.io/user_avatar/discuss.px4.io/jimdgit/32/6860_2.png) [@jimdgit](https://discuss.px4.io/u/jimdgit)\
**Post date:** [November 10, 2020, 6:49pm UTC](https://discuss.px4.io/t/sudden-vibration-introduced-casing-fly-aways/19523/2 "2020-11-10T18:49:28Z")

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For one thing CPU and ram are stressed so sensor sampling time is very high

 ![image](https://discuss.px4.io/uploads/default/original/2X/6/6859104be249bab3d859f59ff902b3f0e7a889e5.png)  
Compared to a PX4 Pro  
 ![image](https://discuss.px4.io/uploads/default/original/2X/a/af9f293ef807169e25974508a3a35f2737b5bc22.png)  
Also a motor is saturating the flat tops mean the FC wants to drive it harder but can’t  
 ![image](https://discuss.px4.io/uploads/default/original/2X/6/692e36beb50c6f487fb77d35c83c2a0a8ff385e1.png)