JJB*
Captain
Flight distance : 12132231 ft
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Hi MrC,
Had a look at your flight.
At about 8 barometer meters height VPS height starts to indicate low height ; 0.8 meters to 0.4 meters.When your SPARK gained height, VPS height did not follow that height wich normally it should do. See the VPS line in the chart.
In that situation (0.4 meter VPS height) with 100% down RC input SPARK will enter a ForceLanding. *
This is normal way of landing from that height, but not ofcourse when the VPS height is measuring an incorrect altitude.
ForceLanding "mode' can be stopped by 100% up, but you did not gave that up input, actually no input at all.In your text i read that SPARK did not react on RC input, in the log no signs of any input while it was landing.
So SPARK landed as it was commanded to do, but not intented to do by you ofcourse.
* this will also happens flying at any high height in the fog/clouds....if VPS height measuring the fog/clouds it will indicate zero, 0.1, 0,2.... 100% down stick will force a landing, omg long way down to ground level if not stopped by 100% up stick.
Why VPS height did indicate wrongly? dirt on the sensor, water on the sensor, sensor error....
You are not the first person on here who looses a drone because if this (VPS height measuring incorrect, wich can be normal for low flying above water or other smooth surfaces).
Always check ( sure for low flying above water, as the risk is high when it goes wrong ) the VPS height in the GoApp if height correlates with the Baro Height.
And when applying 100% down input and the drone will not react directly ; it is a normal beahaviour to wait a little to enter ForceMode landing, so if you aware of that it can trigger you to know that a Forcelanding is activated. If not intented to do so, just counter it by 100% up stick.
PS for drones where you can disable Landing Protection, if disabled this Forcelanding will not happen. So mayby wise to do when you wanted to fly low over water.
Hope DJI can help you out.
cheers
JJB
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