First built vibration and motor twitching. I need help!

S

samu

New Member
Hi, recently I made my first built, it flew fine the first times but after a crash i started to notice really bad high frequency oscillation and video noise at high throttle and when airmode is enable with the quad on the ground the motors continuously change speed.

Here a blackbox video, when i go full throttle at 0:10 and 0:37 the motors start twitching and changing speed super fast, in some moments some of them are bellow 50 % power while they should be near 100%
I notice a slightly damaged component on the ESC i don't know if that's the problem:
here a video where I enable airmode with the quad on the ground, if you listen carefully you will notice the motors slightly twitching and changing speed:
Could be the ESC? Some bad motors? Or maybe the FC is damaged ?
Any help or advice would be appreciated.
 
samu said:
Hi, recently I made my first built, it flew fine the first times but after a crash i started to notice really bad high frequency oscillation and video noise at high throttle and when airmode is enable with the quad on the ground the motors continuously change speed.

Here a blackbox video, when i go full throttle at 0:10 and 0:37 the motors start twitching and changing speed super fast, in some moments some of them are bellow 50 % power while they should be near 100%
I notice a slightly damaged component on the ESC i don't know if that's the problem:
here a video where I enable airmode with the quad on the ground, if you listen carefully you will notice the motors slightly twitching and changing speed:
Could be the ESC? Some bad motors? Or maybe the FC is damaged ?
Any help or advice would be appreciated.
Click to expand...
Looks like insta posts aren't publicly available if twitching on the ground with no props on that's normal because it is trying to correct and has no authority. In general if you see something that looks physically damaged it's worth replacing to see if it is the culprit. Bent props lead to motors and ESCs adding more throttle to get the same thrust and it's okay to bend them back sometimes but basically saying any one small issue can cascade into other issues. Higher amps through ESCs will mean more voltage spikes in the power lines and therefore more video noise. It's also possible during the crash the vtx antenna was damaged or otherwise came loose but if noise corresponds to throttle then it is coming from the ESCs. Adding a low ESR capacitor to the power input can help but better to fix root cause if possible rather than patch things.
 
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