Pixhawk strange behave

pixhawk crashes several times during takeoff … done the calibration several times … but still no luck …plz anyone help… here is the log…00000015.BIN (388 KB)

it seems that your copter was under powered

is your battery ok ? you have a big voltage drop after take off

for a lipo battery 3v per cell is meaning near empty

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thank u @hosein_gh … it was indeed a battery problem …