Kloo Gee
First Officer
Flight distance : 16783757 ft
United States
Offline
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Based on my experience, my assumption is that you have the "RTH at Current Altitude" option disabled and the Spark very likely behaved exactly as documented.
As can be heard in the video, the voice tells you that the battery is low and that it will initiate an RTH in 10 seconds. 10 seconds after that verbal warning was provided (and I'm assuming also shown on DJI Go screen), it initiated the RTH procedure without you cancelling it.
Looking at your log files you posted on PhantomHelp, you were 19.2 feet away from the home point and somewhere between 14 feet (VPS) and 20 feet (IMU) high.
From pg 14 of the manual (https://dl.djicdn.com/downloads/Spark/20170727/Spark+User+Manual+V1.4.pdf):
"When the aircraft is between 3m and 20m from the Home point, it will land automatically with the RTH at Current Altitude option disabled. The aircraft will return to Home Point at the current altitude with the RTH at Current Altitude option enabled if flying at or above 2.5 m, and iw will ascend to 2.5 m then return to hom if flying lower than 2.5 m when the aircraft is between 3 m and 20 m from the Home Point."
As mentioned, your logs show you were 19.2 feet away from the home point, this is definitely between 3m and 20m from the Home Point, so it tried to land automatically.
Had the Spark been over solid ground at the point it decended, it would have stopped at 0.3 m above the ground and hovered waiting for you to confirm for it to land or do something else. However, given you were over water, its sensors may not have been able to accurately determine its height above the water, so it may or may not have sat at 0.3 m and hovered. It looks like you "rescued" it before being able to see if it indeed would hover at 0.3 m or not.
*EDIT1: Edited for terrible typos and ommissions.
*EDIT2: Interesting time for this to pop up, I actually have a video recorded about RTH features that I am editing and hope to publish late today or tomorrow that goes through the different scenarios of the RTH procedure. |
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