title_body: DJI F450 ESC calibration fail
upvoted_answer: I have used the FS-i6, it was my first radio. The throttle is generally on the left, and it is generally mode 2. In your case, it doesn't appear to be the case. So it might be useful to check in the transmitter settings if you have channel assigned correctly.
  You can always see the signals sent to the FC in the Mission planner Setup tap under RC calibration. Ensure throttle signal moves as you desire.
  From what I can see, there is probably some issue with the RC link and the signal being sent to the Pixhawk.