Sparkz71
lvl.4
Flight distance : 24259 ft
Australia
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Page 46 of the user manual states "Do not use the aircraft in severe weather conditions. These include wind speeds exceeding 10 m/s , snow, rain & fog."
Basically, the vision system detects the fog as ground. This can be seen in the log with the erratic VPS altitude readings v's the IMU altitude.
From personal experience, descending through the edge of a low cloud, Spark becomes confused & turned off the downward sensor. During auto landing, Spark failed to slow down & landed harder than normal..
Apart from the hard landing, Spark was always controllable - lucky, Spark didn't attempt to actually land on the cloud!
My logs showed when the VPS detected the cloud & turned off the downward sensor. The final IMU altitude logged was 12 ft when it should show 0 ft - Spark was on the ground. Accumulated error? https://en.wikipedia.org/wiki/Inertial_measurement_unit
Any reflective surfaces below Spark may also cause problems. Be careful over water & snow.
Good luck & safe flying.
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