Maiden flight was very good but after swapping the battery the machine suddenly climbed after arming and decided to do a 180 degree turn and then shove it self onto the ground wanted to know why it happened in the first place, after crash inspected that there were no mechanical or electrical faults.
2025-06-07 15-19-19.bin (820 KB)
The flight mode switch (RC5) was moved to Acro flight mode. Was that what the pilot intended?
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Yes it was later switched to acro in hope that we will regain the control but nothing changed it just did not responded to our controls at all
@amilcarlucas please help with this disaster
Hi @Goobisofty,
I’m not too familiar with analysing tradheli logs but the flight is in stabilize mode which is quite a low-level mode. This means the pilot should have been directly controlling the collective which controls vertical acceleration and thus altitude… so it’s surprising that the pilot reported the vehicle suddenly climbed.
One core question is whether it’s an estimation (aka AHRS/EKF) or a control problem. The EKF’s reported attitude is consistent across the lanes so it’s not an estimation problem.
The vehicle never really has good control of its lean angles (roll and pitch). Below is a graph of the desired vs actual roll and pitch angles and we can see that they’re not tracking at all well.
I think this means it’s either a misconfiguration or a servo failure.
A couple of small things:
- Servo1 output is setup as RCIN6 meaning the RC 6 input will flow directly to the servo1 output. Is this intentional?
- Some arming checks have been disabled (but most are on). It’s normally best to leave this at “1” and resolve the underlying issues.
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Yes initially collective and cyclic were in control by the pilot but after lifting off the heli it suddenly climbed and was not responding to pilots commands at all an did a 180 and crashed into ground and Yes we were using rcin 6 as navigation lights switch to change light mods we did maiden prior to this and was feeling good but swapping the battery this happened could this be a BEC issue we were using castle creation 20 amp pro BEC after crash i checked heli mechanics and servos but all were working just fine could this be a radio interference issue?
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And we were in the process of tunning the heli rates and attitudes but this happened
Hi @Goobisofty,
The RC inputs for roll, pitch, yaw and throttle seem to be arriving so I don’t think it is an RC issue.
That was pilot trying to correct it’s position it was responding at all and later it was switch into acro mode but nothing happened was that a ekf failure issue ?
Or could it be a jammer or some kind of anti drone radio frequency that did this?
Hi @Goobisofty,
No, it’s not an EKF nor GPS jamming issue I think. This is clear because the EKF and GPS positions stay together and the EKF innovations stay low.
It’s much more likely to be a configuration issue or a hardware issue affecting the control surfaces. I recommend comparing parameters from the successful flight vs the failed flight to see if there are any difference.
I think it would be good to check the power provided to the servos in particular.