Ivan03Rus
lvl.1
Flight distance : 1752 ft
Russia
Offline
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Have a good day !
I would like to ask more experienced pilots to help me to understand the reasons of DJI Spark strange behavior when it take off.
And strange difference between Altitude given by barometer and VPS sensor on Spark telemetry.
It all started with the fact that the spark, neatly packed in his DJI bag, was dropped from a height of less than a meter.
After that, he started jumping "like a frog" as shown on https://www.youtube.com/watch?v=_9Vo_1nBUQk
Firmwares are ok, I check 3 last versions with minor improvement on 0.9 and update again to last 1.0 firmware.
RC checked with WIFI and OTG connections, no differrence, 100% RC signak bothway. Compass and IMU both are carefully calibrated.
So as I understand problem most likely in a bottom VPS sensor
I check this method https://www.youtube.com/watch?v=aD2megb5_yc and receive an huge improvement, but result was preserved for only a few flights and Spark start to jump again. If I take off from the ground with manual engines start and vertically upward at full throttle-up (left stick up to 100%) after 2-3 meteres of altitude drone will start to feel more contollable but whatever have a 20-30 cm drift on position and height. What was unacceptable to me because I fly in the mountains and on rocky terrain. So I continue my investignation.
And found a note about rerouting ESC wires https://www.youtube.com/watch?time_continue=30&v=pBa8sXuBtes&feature=emb_logo
This will be a reasonable idea because gymbal connector are made from a thin coaxial cables and bottom VPS camera have a unshielded ribon cabble that goes in touch with front-right engine ESC wire. So I reroute ESC wires so they go flat on the drone shell bottom and don't touch a bottom mainboard shield. Please see:
ESC Rerouting
Jumping stopped, but SPARK, having risen through the autotakeoff, when all sticks are at the center untouched - try to fly-away in the same direction.When drone is faced on me at 11 hour (right-back and rise up) For the purity of the experiment, I ran the launch indoors i.e. without GPS signal. As a result, over and over again the drone goes to the ceiling.
DJIFlightRecord_2020-08-06_[19-40-24].zip
(17.71 KB, Down times: 1)
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