hallmark007
Captain
Flight distance : 9812789 ft
Ireland
Offline
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This has nothing to do with compass, you can do a compass calibration it won't make much of a difference. But drifting like this can usually be caused by IMU , it is basically Imu'S job to keep your AC hovering at a good horizontal. And stable, you never said what height you were at this can also be related to VPS if flying lower than 26 feet.
Your problem also has nothing to do with sticks no need to calibrate those for this problem.
Make sure you calibrate IMU on a very level surface, use spirit level to make sure, below I've left some info I've written about IMU.
IMU "Inertial measurement unit" .
As far as I see it, IMU calibration on a level surface updates a table of values the flight controller software uses as a reference for a level stationary hover. From there the craft responds predictably to flight commands. It also likely measures any sensor noise and thermal drift so that these technical imperfections are accounted for when using IMU sensor data in flight. - this is likely why there must be no vibrations during the calibration process.
Bad IMU calibration could cause drift and attitude issues as the flight controller fights to hold the craft in what it thinks is the correct attitude as opposed to the correct physical attitude.
The IMU usually has 2 types of sensors – angle and acceleration and in turn 3 sensors of each type measuring in the X,Y and Z axis. These sensors can, through vibration, aging, impact etc, drift in their response over time and thus an IMU calibration will establish a new reference for the IMU’s level/stationary state that the flight controller can work with to restore stable flight.
Think of calibration as the bringing back into line the measured craft attitude with the true physical craft attitude.
As to how often an IMU calibration is needed, Refer to your manual ; certainly after any impact or if there are suspicions the craft can’t hover in a level attitude in a windless environment. Also after a firmware update is a good opportunity just in case the stored values get corrupted or are incompatible with the later firmware.
(After firmware may not be needed as it's never mentioned in new manuals) |
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