I have been practicing Auto-mission using Pixhawk, Arducopter firmware and mission planner from quite some time. In the last flight, however, in an attempt to check the failsafe, it was observed that the quad started gaining altitude even after entering the RTL and later LAND mode. The quad started drifting away from the launch site ultimately leading to a crash. A discrepancy was observed in the value of RC3 in and RC3 out channel values also. The logs made on autopilot happen o have stopped abruptly even before the actual crash occurred. The quad was recovered from a place around 300m away from the place where the last entry in the log was found.

We had already performed alt-hold, auto-flight, landing, and RTL checks the previous night and everything were working perfectly fine. The quad automatically went to RTL and landed perfectly when the transmitter was turned off.

My project deadline is approaching soon and  I cannot risk another crash. 

I am uploading the autopilot log too.

I have no idea what might have caused this crash.



You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –


  • Hi . 

    Did the same thing eventually. Used new balanced props , isolated the autopilot using a 2 tier anti-vibration mount and tightened the loose arms . Carried out a few tests and the z vibrations are gone . Haven't faced the same problem after that incident.   Check out the anti-vibration mount I made for the autopilot .Used anti-vibration foam along with vibration isolation balls.Total Vibration killer XD 



  • Z vibrations were way too high now-and-then during the flight, looks like something is unbalanced/loose and starts to resonate.

    The last 12 seconds have absolutely crazy vibrations , plot IMU.AccX,Y,Z  , most likely something fell apart midair, a prop fragmented, motor came loose etc..

    go for higher machanical quality (when building)

  • In cases where the copter climbs out of control it is due to Vibrations.  That is the case in your flight as well.

    The thing about vibrations is that wind at the right direction can increase them or sudden changes in motor speed.

    Since the unit was bad to start they increase enough to become uncontrollable.

    Also turning the radio off during a failure is not going to shutdown the copter.

    You should switch to Stabilize mode and reduce the throttle.

    Since the unit flew towards people it could have ended badly.

    Land and RTL only work if all the sensors are working correctly.

This reply was deleted.


DIY Robocars via Twitter
RT @SmallpixelCar: Test my algorithm on real car https://t.co/idWRxcrmuK
DIY Robocars via Twitter
RT @breadcentric: Evo is coming to town. If you have an #AWS #DeepRacer, you can purchase an extension pack! https://t.co/w60JwI98Hp #Machi…
DIY Robocars via Twitter
DIY Drones via Twitter
RT @chr1sa: My talk on PX4 and FAA certification is coming up at 1:45 PST today on the PX4 Dev Summit livestream. Includes some cool new st…
Jul 7
DIY Drones via Twitter
RT @seesharp: I'm tuned into the PX4 / Dronecode free live conference. Great stuff. Microsoft AirSim talk in 10 minutes. https://t.co/0zbZ2…
Jul 6
DIY Robocars via Twitter
RT @masato_ka: 距離センサを3つとESP32を付けたラジコンカーをDonkeyCarライクにNNで自動走行。3層FC極小モデルをTensorFlow Lite for microcontrollerで動かしてる。機体は借り物でRumiCarって言います。Tenso…
Jul 5
DIY Robocars via Twitter
RT @SmallpixelCar: My car was able to go all the way autonomously until the crosswalk. It was only 100 yards from the target. What should b…
Jul 4
Liam left a comment on Agricultural UAVs
I'm Liam from T-MOTOR. I would like to reach out to see if there is any possibility for us to work together.
We are a propulsion system manufacturer who offers motors, propellers and ESCs for all kinds of drone applications which vary from secur…"
Jun 30
DIY Robocars via Twitter
RT @SmallpixelCar: Smart move. The car used the shadow to guide it through the bridge. This was never in the training samples. But it learn…
Jun 30
DIY Robocars via Twitter
RT @SmallpixelCar: Getting closer to the target. Single camera. Untrained road. https://t.co/Wsr7RwDamj
Jun 29
Richard Cox left a comment on Australia
"Anyone in the DIYDRONES Australian subgroup based in Alice Springs, NT?
I am experimenting with Ardupilot (standard Arduplane), Pixhawk 4 FC in a 4-ch
RC "AXN Floater Jet" foamy plane..."
Jun 29
Omar Sykes left a comment on Australia
"Hi everyone, I am looking for someone who is good at drone building, repair and software in Adelaide. Please give me a call on 0477 319 219."
Jun 29
DIY Robocars via Twitter
RT @RoboticMasters: #donkeycar https://t.co/czuLoVRcA4
Jun 29
DIY Robocars via Twitter
Jun 29
DIY Robocars via Twitter
RT @RoboticMasters: Donkey car, car car car car car car; Donkey car, car car car car car car; Donkey Car. Anyone like our tiny tiny donkey…
Jun 29
DIY Robocars via Twitter
RT @SmallpixelCar: After improving DBSCAN speed, I can get 11 frame per second on @NVIDIAEmbedded Jerson Xavier MAXN mode and the autonomou…
Jun 26