Hi .
My Heavy Octa Quad with The below Details Crash just after Leaves The ground .
After the Good Take off in about 50cm above Ground and when ATC Tried to Correct the Roll Error it becomes Unstable and start to SWING in Roll Axis very Hard and Fast. I was terrified of Motors Sound and Crash Just Happend.
it was with the Default PID Paramaters . and for the First Flight always I Flight in AltHold for INOTCH Filter sampling . and this happend in the First Flight .
Flight Controller : Cube Orange + APM 4.5.1
Frame : Octa-quad (Coax)
Motors : Hobbywing H11M 48 * 17.5 Probes
Battery : 14S Lipo 22Ah
TOW : 40Kg (My case)
after Payload Coming TOW : 90 - 100 Kg
Motor Test is Done Before Takeoff
I know the
MOT_THST_EXPO = 0.5
Is not suitable for this Motor According to this .
but in my Experience Not Valid EXPO doesn’t cause this types of crash .
For a long time I use MOT_THST_EXPO = 0 for heavy Motors Like X9 by Mistake And @xfacta found it in Some Motors Desync that Cause the Vibrations .
I Think the Default PIDs is not suitable for the Heavy one Like This .
Maybe decreasing the Acceleration would Help . but I Think The Default PID Terms has to change .
the log can accessed from
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