Sean-bumble-bee
Core User of DJI
Flight distance : 15997 ft
United Kingdom
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Tom Dick Harry Posted at 12-10 09:50
Could dji step in and clarify the technical aspect of this issue? I find we have some strong debaters, but we lack some basic technical information keeping this discussion tortuous. Can dji simply clarify what reference the drone uses as ceiling height, and how it does it?
Are you talking about how the drone measures height other that VPS height?
If so, what is there to debate?
A drone exposed to partial vacuum reports its height as increasing and, when subjected to increased pressure, reports its height as decreasing, all whilst sat still with no GPS.
Can you come up with any other explanation for that behaviour?
Try the drone in a bag experiment with zero GPS i.e. indoors or with a metal cover over the top-front of the drone, for yourself and see.
As far the achievable height, set your drone's maximum height to 70m and send it up to that height.
Once it is there reduce the maximum height setting to 25m, do not touch the throttle and watch what happens, does the drone descend to 25m?
If, by any chance, the set RTH height was greater than 25m then check what the RTH height is now set to, 25m? Now reduce the set maximum height to the minimum available, what happens the the drone and the RTH height.
Try to send the drone up above the set maximum height, can you?
If the firmware enacts a 120m ceiling in the EU then the affected drones WILL be limited to a 120m ceiling relative to the takeoff point irrespective of their horizontal distance from the home point.
The only DJI drones to break the set maximum height ceiling and the firmware ceiling have been malfunctioning drones.
I have the flight logs of around 480 troubled flights saved.
Of those, nine logs show the drone exceeding 500m by a significant amount and two of those show evidence of hacked firmware, with max height settings greater that 500m, three others might show signs of it as their logs show max height settings of 0.00.
Eight logs show the drone breaking 500m by a small amount, less that 2m, seven of those broke 500m by less than 1m, all of the eight had set ceiling heights of 499.99m. Four logs show the drone reaching 499.5m to 499.8m with set ceilings of 499.99m.
All my own flights have warned me when I was approaching the set ceiling height and from memory reduces the ascent speed, I do not think any of them have broken that ceiling by any significant amount. It would be too complicated to check the latter as I tend to set a diferent max height setting for each new location.
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