Dirty Bird
Captain
Flight distance : 41442379 ft
United States
Offline
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A cold IMU caliibration is what I always do. I place the drone in the freezer for about 10 minutes. Just the drone NOT the battery. I have the app already running, pull the bird out of the freezer, insert battery & power her on, then the instant it connects I perform the IMU followed by a gimbal calibration on a level surface. Performing the IMU cold greatly reduces the time the bird takes "warming up" when you power on.
On the horizon issue. I have 7 DJI drones. With the exception of the P2 ALL of them sometimes have horizon issues. Sometimes the gimbal has excellent level performance. Other times it ruins your shots completely. For photographs it isn't much a problem as you can just rotate & crop the image. For video it is a real PITA to correct particularly since it changes throughout the flight. It is mostly noticeable when flying in windy conditions especially if you are yawing/rotating or flying sideways. Try this: Hover & slowly rotate 360°. As you perform your rotation you'll probably notice the horizon slowly go from tilted one way, through level, then it will tilt the other way, then back to level.
If I had to guess the problem stems from this. Early gimbals were generally add-ons & had dedicated level logic as a part of the gimbal hardware. The gimbal contained its own level sensor & accelerometer which was there for that specific function. On the DJI craft from the P3 forward, the gimbal seems to be controlled by the FW in the mainboard. It relies on the "level" of the flight controller. Somewhere in the FW it (sometimes) seems not to compensate for angle of the aircraft induced by the wind. Previously I posted a video example of this where my P3 is flying with a strong cross breeze & you can see the effect. One solution I see would be if DJI added a dedicated level sensor into the camera head. Then, rather than relying on a calculation from the FC sensor, the camera level could be read directly. I'm no engineer but I think having a dedicated level sensor in the camera head would alleviate the horizon issue.
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