# Hard vibration on new build with Voxl Flight

Source: https://forum.modalai.com/topic/625/hard-vibration-on-new-build-with-voxl-flight
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: voxl-flight
Posted: 2021-12-28 15:49:42 UTC by bensusana
Replies: 4 · Views: 991

## bensusana · 2021-12-28 15:49:42 UTC

hi there ,
i recently build 5" quad with voxl Flight 
setup is : 5" frame (generic racer frame) airbot Furling32 v1.2 esc's,
tmotor 2550kv motors.

all pix4 params are default didn't change nothing ,
just when arming and lift the throttle up the drone vibrate very hard and the motors and esc's goes very hot.

i tried to change pid settings but it seems that nothing have impact on this behaver .

i took another quad i have same frame motors and esc's but with another FC and it flying smoothly without changing anything same version of px4 and same params .

any  help or guidelines will be much appreciate,
 thanx in advance 
ben

## Reply by Chad Sweet (ModalAI staff) · 2021-12-28 23:38:42 UTC

Hi Ben, Flight Core ships with a very slightly modified PX4 v1.11 ([details](https://docs.modalai.com/flight-core-firmware/))

Assuming the motors/props are mounted securely in the proper rotation, you may need [ESC calibration](https://docs.modalai.com/fc-configure-misc/#10-esc-calibration)?

The Flight Core does not deviate significantly from a normal Pixhawk, so it's tough to imagine anything too exotic occurring. Can you try to put the other flight controller on there to eliminate any differences?

## Reply by bensusana · 2021-12-29 07:13:53 UTC

I'm working with DSHOT protocol and i don't have option to perform esc calibration through Qground control because i cant power up the voxl flight with usb power as you mention on your link.
i also read that using DSHOT doesn't require ESC calibration ,did i got it correctly?

## Reply by Chad Sweet (ModalAI staff) · 2021-12-29 16:28:27 UTC

That's true regarding dshot.

Have you spun each motor individually to make sure they are wired correctly? This still sounds like an assembly issue

Can you share a video?

## Reply by bensusana · 2021-12-30 09:05:47 UTC (in reply to Chad Sweet)

@Chad-Sweet 
so we find the problem :)
it was the rubber dumpers that we put to hold the voxlflight , it seems that they were too soft and added vibration to the board .
we  took them out and the problem solved.

do you have recommendation about required suspension/vibration absorber for the board? or there is no need ?