KlooGee
First Officer
Flight distance : 16783757 ft
United States
Offline
|
Nidge Posted at 2018-5-3 01:46
Just as a supplement to my earlier posts. Yes many claimed incidents can be attributed to user error but it is a fact that quite a few are not and this is a cause for concern.
In the linked video the owner provides a great narration of events as they unfold. Why would the Spark, while flying in tripod mode, suddenly decide to switch into Sport mode and advance at full tilt when it deems that GPS performance is compromised and reverts to ATTI mode? Another owner local to me experienced exactly the same anomaly last week but unfortunately his Spark was not recovered. He sent his flight logs to DJI and within 24hrs received a notification that a replacement was to be shipped. Unfortunately, and yet again, DJI failed to explain why or what was the cause of the failure.
Nidge,
I have reviewed the logs for the flight that you have provided the video link to. The behavior that is seen in the video is very easily explained based on the data in the logs. Firstly, the pilot was flying in a canyon that severely limited the view to the sky to a very narrow angle. This caused the GPS signal to be teetering on the edge of working and not working. Below is a copy/paste of the rest of the feedback I provided to the pilot in a FB post. While unfortunate the circumstances and results, I think the behavior and result is quite understandable given the circumstances.
I think your situation was a bit unfortunate in terms of the circumstances and timing. From what I can tell while you were in tripod mode you were in full speed forward (i.e. right stick was full forward). While you were in tripod mode, this was not a problem given your environment because it was moving slowly. However, as soon as it switched to ATTI mode, the right stick was still full forward for about 2 seconds. In ATTI mode, the aircraft will have full power available to it unlike in tripod mode where stick movement results in very little movement. So the 2 full seconds of full stick forward resulted in the sudden movement you reported and is seen in your video and the logs. Also as you know, in ATTI mode, letting off the stick does not result in immediate braking. So from my perspective, it appears to be the unfortunate series of circumstances that lead to the end result. I’m not passing judgement at all, just trying to provide an objective view based on the data. |
|