geva
New
Flight distance : 2221 ft
France
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Hello,
I have had issues flying and filming due to drone altitude changes. I just did some tests on a relatively flat area of a field in the mountains by doing some figure eights in front of me and saw some really strange altitude behavior.
- To the left of the flat area in front of me, the field slopes downward.
- To the right of the flat area in front of me, the field slopes upward.
- I start by positioning the drone far to the right about 50cm from the ground (as far right as I'd fly).
- This is about 2.5m above my height (and take off position).
- As I fly out in front and to the left, the drone gains altitude - In front of me it is at about 4m.
- As it flies left when the terrain goes down it gains much more.
- It seems to be 20-30m from the ground, but I'd guess it should be at 10m if it had flown flat.
- I bank it back around to cross in front of me and a bit to my right.
- It has now done a figure 8 back to the same position without and up/down adjustments on the height stick.
- Instead of being at the presvious 0.5m height, it is now at 10m.
For the life of me I cannot understand this behaviour as it goes contrary to how it should be able to fly at a level altitude. It even has a strong GPS fix, which should be feeding the drone with reasonably accurate altitude data. If it had a baraometer this would be even better - but I don't believe that it does.
Could someone please explain to me what is going on here and how I might be able to avoid it?
I love all of the intelligence that DJI packs into their drones, but I am not going to buy any better drones when such basic things around flight height and stability are unreliable. (No comment on the height vs. AGL contradiction).
Cheers,
Greg
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