I’m experiencing a critical issue with a fixed-wing aircraft running PX4 firmware v1.16.0. During flight testing, an abnormal failure occurred:
For the first 16 seconds, motor control functioned normally. Suddenly, the motor power began rapidly oscillating between 100% and approximately 20%. This caused uncommanded left roll followed by immediate loss of control and crash.
Notable context:
The flight controller has prior water damage history
For graph clarity: Motor PWM output values are multiplied by 10 in the charts
In fact, just before replying to your message, I experienced a similar crash. The aircraft had successfully completed 5 laps along the preset route under normal conditions. During the hand-launch for the sixth flight (using the exact same technique as the previous five), the plane failed to pull up promptly, collided with the ground, and broke the landing gear.
After repairing the landing gear, I proceeded with the seventh hand-launch. This time, immediately after takeoff, the aircraft rolled rapidly to the left – exactly like the crash described in the original post – before impacting the ground.
I am deeply puzzled by these incidents. Through troubleshooting, I have confirmed that both the motor and electronic speed controller (ESC) are functioning normally. I am completely confused and would greatly appreciate expert advice.
In fact, just before replying to your message, I experienced a similar crash. The aircraft had successfully completed 5 laps along the preset route under normal conditions. During the hand-launch for the sixth flight (using the exact same technique as the previous five), the plane failed to pull up promptly, collided with the ground, and broke the landing gear.
After repairing the landing gear, I proceeded with the seventh hand-launch. This time, immediately after takeoff, the aircraft rolled rapidly to the left – exactly like the crash described in the original post – before impacting the ground.
I am deeply puzzled by these incidents. Through troubleshooting, I have confirmed that both the motor and electronic speed controller (ESC) are functioning normally. I am completely confused and would greatly appreciate expert advice.
Attitude SP can disable if you violate roll or pitch maxes aka terminate but I don’t see that here.
I guess with the backstory of the autopilot and its damage that’s worth something.
low on stack is a bit early to coincide with something like this.
the interesting thing is twice By the same user. I’d say next step is a new autopilot exactly the same parameters. If still happens we have a real issue. If not it is something hardware level given water damage (which tbh I’m skeptical of now, there’s Something going on).
