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NEVER FLY IN FOG
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<blockquote data-quote="monty.roman" data-source="post: 70542" data-attributes="member: 12865"><p>i'm not an expert but still wanna add something to discussion. </p><p></p><p>Spark really use barometric sensor to measure height above launch position (not the altitude above sea level). The main problem with the fog (besides the moisture) is fact that the bottom sensors on spark will take over the height measurement control when the aircraft is lower than 5.5 meters (or if they detect an obstacle) and since the fog may be detected as a solid ground, the telemetry height will drop to the 0 and Spark will kick in the autolanding with very slow descend speed. this might be a problem because with very slow descent you can easily run out of the battery before you get to the ground safely (this happened to one guy from our Czech Spark group - during the descent through the fog, the telemetry dropped from 150 meters to zero and the Spark started to autoland and slowed down to 1kph vertical speed. Results - the battery ran out mid flight about 60 meters above ground completely. Autolanding couldn't be canceled all the time for some reason). The solution to descend in the fog freely is to disconnect the bottom sensors mechanically (warranty void instantly).</p></blockquote><p></p>
[QUOTE="monty.roman, post: 70542, member: 12865"] i'm not an expert but still wanna add something to discussion. Spark really use barometric sensor to measure height above launch position (not the altitude above sea level). The main problem with the fog (besides the moisture) is fact that the bottom sensors on spark will take over the height measurement control when the aircraft is lower than 5.5 meters (or if they detect an obstacle) and since the fog may be detected as a solid ground, the telemetry height will drop to the 0 and Spark will kick in the autolanding with very slow descend speed. this might be a problem because with very slow descent you can easily run out of the battery before you get to the ground safely (this happened to one guy from our Czech Spark group - during the descent through the fog, the telemetry dropped from 150 meters to zero and the Spark started to autoland and slowed down to 1kph vertical speed. Results - the battery ran out mid flight about 60 meters above ground completely. Autolanding couldn't be canceled all the time for some reason). The solution to descend in the fog freely is to disconnect the bottom sensors mechanically (warranty void instantly). [/QUOTE]
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NEVER FLY IN FOG