@jwmcgrath and @sar104, thank you very much for your analyses and hypotheses. They both sound like possible causes for the AC to suddenly drop. Do you think there is enough data to ask for a replacement, since it's still within the warranty period? There's no proof of a bird strike. From your feedback, there doesn't seem to be any definite proof of something external to the P3P that would cause the prop to fly off. A bird strike might be a possibility, but no definite proof.
Yeah. DJI didn't send me a detailed report as to what went wrong just a (paraphrased) "oops. Our bad. Here's a fixed one." note. Took 10 weeks but at least I didn't have to pay for it.
At least you are not going to pay for the fixing... I can wait longer than thatThis was like reading a murder mystery, with a happy ending. Happy for you. ......But 10 weeks of anxiety and mental anguish. [emoji33][emoji35]
Look closely at the 2:53 mark of the video. What is the object on the right side of the screen that flashes and then is gone?
Great video brah... And should put to rest this "prop fly off" debate.I did a test some time back to see if suddenly slowing a motor (active braking) could make a prop fly off. I installed a prop as loose as possible and manually grabbed the motor bell at different speeds. I found that it was nearly impossible to make this happen. Just starting the motors would snug up a loose prop pretty well. Only at the very highest speeds, with a completely loose prop was I able to make one fly off. I also tested the effect of losing one motor phase as would happen with a disconnected wire or ESC glitch. In this case the prop would fly off instantly and consistently even if it had been installed pretty snug. I think this is more likely the cause of many of the prop loss crashes that were blamed on props not being installed tight enough.
At times in this video, the prop looks like it is moving slowly but it is just turning at a rate near the camera's frame rate. At the end of the video, you can see what happens if you disconnect a wire and lose one motor phase. Obviously, this was not a P3 but the physics should be the same.
Has this ever happened to you? Is there any reason DJI wouldn't honor the warranty?* The AC was flying smoothly using the AutoPilot Waypoint mode of a 9 hole mission. The AC suddenly fell from the sky at the halfway point of the mission with 60% of battery life left, at about the 11th minute, from an elevation of about 40 meters during the peace of dawn. I can see no apparent cause of the crash. Attached are (1) a screen capture of the completed flight route when the crash happened, and (2) a compressed zip file with the log data of the flight. This YouTube video shows the flight up to the crash: Please forgive the soft and grainy quality of the video. It is from my iPhone which videoed computer screen running the recovered video. The video file was truncated because the recording wasn't properly turned off as a result of the crash. The recovered, but unstable, h265 file format video can only be viewed with VLC. There doesn't seem to be any other way to convert it. Most of the (iPhone-recorded) video is sped up 2x. The video speed is then back to normal just before the crash, which actually happens at about 10:44 (mm:ss) of the raw video. In this sped up version it happens at about 5:28. (I'm still trying to fully recover the video. The lighting was perfect for post processing.)
Music: Clouds by audionautix.com
*DJI Thailand says it needs to be sent to Hong Kong to analyze. It could take 2 months before any decision on what my options are.
I did a test some time back to see if suddenly slowing a motor (active braking) could make a prop fly off. I installed a prop as loose as possible and manually grabbed the motor bell at different speeds. I found that it was nearly impossible to make this happen. Just starting the motors would snug up a loose prop pretty well. Only at the very highest speeds, with a completely loose prop was I able to make one fly off. I also tested the effect of losing one motor phase as would happen with a disconnected wire or ESC glitch. In this case the prop would fly off instantly and consistently even if it had been installed pretty snug. I think this is more likely the cause of many of the prop loss crashes that were blamed on props not being installed tight enough.
At times in this video, the prop looks like it is moving slowly but it is just turning at a rate near the camera's frame rate. At the end of the video, you can see what happens if you disconnect a wire and lose one motor phase. Obviously, this was not a P3 but the physics should be the same.
Sorry for your loss. One thing I became aware of when I regularly flew my first P3P was after a mid to long flight 10-20mins duration and doing a post flight check I found the props would be warm and sometimes hot. Now I live and fly in Thailand, so its mostly hot days here anyway but even on the cooler days and early evening flights for sunset vids they would be warm to touch. I know on more than one occasion I had to retighten one or two props. Then I started to use the prop tool and give it 1/8 more than finger tight every time. Since then I have never had this problem. I can suggest that maybe one prop might have warmed enough to become loose and ultimately come off. Just a theory but very real if combined with stick control movements at the critical time.
Great to know. Thanks for sharing!Not just you. Shortly after they were released, I had one freak out on me. Confirmed by DJI that it was their technical glitch and they warranty repaired it for me at no charge. Edited to add that this was an area I regularly flew in.
Can you check if the front right ESC did fail? Even if you can't power up the aircraft, you can check if all the connections look good. If it was ESC failure then DJI may well be willing to repair or replace under warranty. You just need to be able to demonstrate that it was not user error, such as an improperly attached propeller. I'm not sure whether @With The Birds's observation regarding the motor design means that these motors behave differently than demonstrated by @syotr, but it's probably worth pursuing anyway.
I think, from a "warranty hopeful" perspective, you may be facing something exactly like this:
We can try to do the best we can to analyze everything for you but in the end, they will decide whether it's covered or not.
I truly hope they cover it for you and hope they explain why!
It's between the camera and the landing gear - it would have to be perched on the horizontal strut. That would be one crazy bird. It's not a bird.
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