fans4a4d3789
lvl.4
United States
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Hello fellow pilots.
I search through these forums on a regular basis in order to find posts similar to my experience today, so I thought I would share.
I just had an Inspire 1 pro, approximately 1 and a half years old with a little over 100 flights, fall out of the sky today as I was slowly raising the altitude. I am still unsure of exactly what happened but I have a couple thoughts on it. I am very careful about my pre-flight checks and everything was properly attached and the arms did not have any cause for concern.
Facts of the flight:
- Battery was initially at 97% on take-off, due to heating the battery prior to flight.
- Received a "Battery temperature is below 15 degrees celsius, Warm up the battery to above 25 degrees Celsius"
- Received a "Propulsion output is limited due to battery health"
- Saw the initial voltage drop to approximately 3.3V immediately after take-off
- The camera was still working and displaying as it was falling (Don't believe it was a battery issue)
- The aircraft yawed clockwise during fall
Inspection of the crashed drone:
- Right front motor was partially seized. It would still rotate, but was difficult to get it to turn. All other motors were properly rotating
- All quick-release propellar locks were in locked position at the time of inspecting the UAV.
I have a feeling that the right front motor may have seized during the flight, which caused the drone to fall. This motor partially being seized seems unlikely to be damage related due to no direct contact at the motor. There was, however, direct contact damage on that same motors landing gear, directly below the partially seized motor. The damage on this landing gear appears to be consistent with taking most of the impact with asphault. This also makes me think that a seized motor would induce a roll such that it would be the first contact point with the ground.
I will post updates on what DJI's analysis reveals.
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