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drone crash! Dropping a drony, it looks like due to a motor cut-off. How to avoid in the future?

At 234sec you did a CSC on your remote and stopped your aircraft's motors, after having previously configured the app to respond to that order in flight...
See manual page 56.
 
Oh yeah ... I'm so naive ... No, of course, the reason is in something else

235.285 : 13983 [L-RC]arm stop because of craft fail in near history
235.285 : 13983 [L-RC]rc cmd:STD_STOP_MOTOR
235.300 : 13983 [L-FLYLIMIT]get 1860 data err:9 188
235.302 : 13984 [L-FMU/MOTOR] Stop. reason:REQ_RC_NORMAL
235.302 : 13984 [L-FMU/MOTOR]Total start times: 1, time: 235.42
235.302 : 13984 [L-PWM]set actuator mode:IDLE
235.303 : 13984 [L-FLYMODE]CTRL reset all by motor stopped
235.306 : 13984 [L-FMU/FSM]state changed. cur: motor off
235.306 : 13984 [L-FDI][CTRL]: fault off, height_ctrl_fail
 
Well that log confirms it, plus you ARE giving a CSC order right when it stops...

Clipboard01.jpg
 
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Ok, it turns out the drone fell from a height of more than 1000 meters and did not get damaged? Only on the propellers small holes? The next day it took off as if nothing had happened on the same propellers.

If your diagnosis is accurate, then I have nothing to fear in the future.

but...
235.285 : 13983 [L-RC]arm stop because of craft fail in near history

S80911-174604.jpg
 
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The "failure" and the fact it activated the "breakdown" condition are due to your mods and excessive height.

You bypassed the height limit, and exceeding it is considered by the supervisor as a failure of the height control system. This happened just after you passed 500m:

86.885 : 6563 [L-FDI][CTRL]: fault on , height_ctrl_fail
[...]
86.902 : 6564 [L-RC]craft ctrl failed!!!

and the "[L-RC]craft ctrl failed!!!" errors are then repeated every 2 seconds for the remainder of the flight.

What mods did you do exactly? Might be possible to improve things...
 
Many thanks, very plausible explanation! I'll be much more careful in the future
 
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