Why is my one motor not working? :(

As you can see only 3 of my motors work at half throttle, and the other day i broke a frame arm due to me descending and reducing the throttle it flipped over and crashed, 


it cant be the motor as in the video it is a brand new one, 

could it be the ESC?
please give me an idea of how to fix this :) thanks in advance

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Replies

  • have you calibrated your esc ?

     

    by the way is your TX in heli mode ? if it is switch to aero mode

     

    cheers 

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