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<blockquote data-quote="suprPHREAK" data-source="post: 21893" data-attributes="member: 1505"><p>Had a long answer but my iPad ate it (seriously hate iOS). here is the short version:</p><p></p><p>100% of fly aways are rooted in compass errors. Without compass, GPS is useless so the drone ignores it, and goes into atti mode. Atti mode is supposed to fly flat and level with no stick input, but if the IMU was not properly calibrated, it will fly away.</p><p></p><p>To prevent them:</p><p></p><p>1- do an IMU calibration on a FLAT AND LEVEL SURFACE. This instrument is not sensitive to metal, so whatever you use. The IMU calibration, among other things, creates the reference point for where level is. If this is incirrect, the drone will enter whatever position it thinks is level...and if that position is tilted, then the drone will move in that direction, and continue to accelerate.</p><p></p><p>2- do a compass calibration as far away from metal as possible. Middle of a soccer pitch, baseball outfield, middle of a corn field. If you calibrate with interference, then when you fly up in the air away from the metal, the robot will interpret the lack of interference as an error. Also, when calibrating, be a couple metres from your mobile device. Put it on the ground, take a few steps away. I read somewhere this matters.</p><p></p><p>3- dont take off from metal or concrete (which usually contains metal). In theory, when you take off and leave that interference, things should be OK, but it could introduce unpredictable flight behaviour.</p><p></p><p>When people say flying within 100m of a pop can will cause compass errors, that is BS. If you follow the above, you should be OK once airborn, near almost any structure.</p><p></p><p>Also, the Mavic is far more fault tolerant than the Spark, as it uses dual IMU and dual compass. The result is it can filter errors better, adding some insurance before things go wrong.</p><p></p><p>Let me know if you want the very detailed answer.</p></blockquote><p></p>
[QUOTE="suprPHREAK, post: 21893, member: 1505"] Had a long answer but my iPad ate it (seriously hate iOS). here is the short version: 100% of fly aways are rooted in compass errors. Without compass, GPS is useless so the drone ignores it, and goes into atti mode. Atti mode is supposed to fly flat and level with no stick input, but if the IMU was not properly calibrated, it will fly away. To prevent them: 1- do an IMU calibration on a FLAT AND LEVEL SURFACE. This instrument is not sensitive to metal, so whatever you use. The IMU calibration, among other things, creates the reference point for where level is. If this is incirrect, the drone will enter whatever position it thinks is level...and if that position is tilted, then the drone will move in that direction, and continue to accelerate. 2- do a compass calibration as far away from metal as possible. Middle of a soccer pitch, baseball outfield, middle of a corn field. If you calibrate with interference, then when you fly up in the air away from the metal, the robot will interpret the lack of interference as an error. Also, when calibrating, be a couple metres from your mobile device. Put it on the ground, take a few steps away. I read somewhere this matters. 3- dont take off from metal or concrete (which usually contains metal). In theory, when you take off and leave that interference, things should be OK, but it could introduce unpredictable flight behaviour. When people say flying within 100m of a pop can will cause compass errors, that is BS. If you follow the above, you should be OK once airborn, near almost any structure. Also, the Mavic is far more fault tolerant than the Spark, as it uses dual IMU and dual compass. The result is it can filter errors better, adding some insurance before things go wrong. Let me know if you want the very detailed answer. [/QUOTE]
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