At Phantom you can't put the wrong propeller on.Which direction does it flip forward, backward, left, or right?
Is it always the same direction?
Check that props on front left and right rear have the same pitch, and front right and left rear are the same pitch. Both front and both rear should have opposing pitch.
One thing that I discovered that caused mine to flip once in a while was trying to take off on uneven ground. Even though the ground might look even there might be a little slope to the ground. I find it useful to get down to ground level and make sure the ground is level now. And another thing I use is a landing pad to keep debris and grass away from the drone.I just got a Phantom 4 and I put all props on correctly checked the direction of motors etc, as soon as I applied power it just flipped. I looked at one prop and it looked fractionally different to the opposing one (tips were a few mm lower), replaced that one prop and it was fine.
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