120ccpm
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Flight distance : 1245115 ft
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m80116 Posted at 3-22 04:00
Basically this goes to show Mavic Mini was not faulty when delivered and in full working order like many others.
Over time and with usage and storage and transport the propellers gradually lost their shape... interesting to notice in all these similar cases MM gradually descends while going forward, this is especially true since the rear motors are maxed out (because the rear props are the ones pushing harder in forward motion and still not producing enough lift).
I've seen DJI recommending people who reported similar issues to replace their props, but I'm not sure if it's just a standard precautionary response, or if they had their reasons.
The photos you posted are quite telling... either there are two different types/batches of props around, or they appear to lose their shape over time. The MM props are paper-thin, to the point I modded my case (eBay purchase, not OEM) from day one, so that they would not be under any pressure. For the same reason, I do not put any strap around them, or let the MM sit on a table with the arms folded in.
But props don't go bad all of the sudden, mid-flight, whereas these uncontrolled descents seem to happen out of the blue, and cannot be recovered. Maybe there is a real hardware issue, like a failing ESC, and the flight controller has no option but to reduce power all around to keep the AC level and prevent it from crashing. Or maybe the firmware sees something out of place and initiates some sort of emergency landing as a precaution (limp-mode). Pure speculation, this "something out of place" could be the motors failing to provide the necessary thrust, because of the flat props.
As for the rear props pushing harder than the front ones when moving forward, I don't think that's correct: yes the flight controller gives more power to the rear to tilt the AC, but then it maintains it in this position and all motors are pushing more or less the same way (otherwise the AC would continue to tilt).
PS: I cannot explain why you got 4 downvotes on this post... |
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