m80116
Second Officer
Flight distance : 3264131 ft
Italy
Offline
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First, let me assure @djiuser_kMh2IHAs3PMZ and all others that I answer each and every one that's questioning.
I am novice pilot as well so I usually include an explanation of the acronyms and abbreviations used by the drone community.
Terms like FC, ESC, IMU should be part of our vocabulary. FC for example is the Flight Controller board, the CPU of the drone, ESC is Electronic Speed Control circuitry and IMU is the Inertial Measurement Unit, the sensing unit of motion control for the Aircraft (often abbreviated AC, as the remote is abbreviated RC and the mobile device linked to it MD). CSC is used in the MM manual as Combination Stick Command (a command with the control sticks on the remote). MM stands for Mavic Mini.
- W/ CSC of death I intended a combination of movements on the sticks that put the AC under maximum load, considering it was already maxed out as confirmed by the generous errors it was an almost inevitable instability and drop (more on this later)
- Mode 2 is the default configuration of the CS (Control Sticks) on the RC, Left stick UP/DOWN and Yaw LEFT/RIGHT (turn on itself LEFT and RIGHT), Right stick FORWARD/BACKWARDS (pitch down, pitch up) and move LEFT/RIGHT (roll LEFT and RIGHT).
I know that many warnings you see now for the first time weren't delivered but just registered for posterity, but you had already enough Wind warnings which you should not have ignored, Wind warnings are a serious business on the Mavic Mini.
To let you better understand the force a little bird like the Mini can exert some user weighted down the little creature and came up w/ numbers, the maximum pulling power from the little Mini was about 200 grams. You can even try to experience it yourself with an auto-takeoff while grabbing the Mini w/ index and thumb finger from the bottom, clear of the props (let it go after a couple of seconds). It's very little force, small wonder the wind can have a huge impact on such a low weight.
Your case wouldn't have happened if you followed the instructions (that you received) of landing and manually flying aware of the implications by the second warning, which happened much earlier in the flight. Also to notice the mode into which you operated (Cine Mode) furtherly limited the wind resistance of the Mini below the maximum nominal of 8 m/s.
Your Mini was pretty maxed out for the wind, in a short period of time you did input an instant CS down which upset the drone a little (letting it drop further down) and then used LEFT Control Stick UP and RIGHT Control Stick UP.
To let you better undestand what happens when the drone moves forward just start the motors while landed and use the Right CS. For the pitch down (forward motion) the FC reduces the front motors performance and increases the rear ones.
In case the system is maxed out by the wind, as the numerous warnings suggest, and in this case with very little instant power headroom if at all (since the batteries were quite down on their way) the rear motors should have increased their rpms.
In this case as in other cases the missing lift generated by the front propellers caused the front to pich down (thus forward moving) but the rears couldn't keep up with the speed required and the drone dipped too much.
My theory as shown in other cases is that eventually the drop stabilizes once the motors spin up fully and FC balances it out, but under intense frontal winds with a partially reduced lift on the frontal axis and maxed out rear the overall lift is compromised and the drone descends gradually while gaining little speed or being blown backwards.
To maintain height the best strategy is to not pitch or roll the drone, no Left stick control, althought this causes a drift in the wind. Unfortunately there's no cure for a blown in the wind drone if not DON'T BE THERE... so one should carefully choose calm wind days (checking for wind at height not ground and for gusts) and possibly fly first against the wind, follow rigorously the wind warnings (especially when they instruct you to land) and never with a close to the safety level of 20% battery (where power delivery isn't up to its best).
I hope this helps you identify the conditions that led to your crash landing after 13 minutes from the second user warning that instructed you to land.
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