DM007 Motor dead and more?

[Nenad Pantic]

Here goes the fun story.

This Summer I flew DM007, when it fell and was caught in a tall grass. I was unable to find it, so I was forcing the motor a bit to hear buzzing so I can find it. Eventually I found it, One motor caught badly tall grass but that one was still working after untangling it. The other one appeared dead.

I'm not especially skilled electrician , so I assumed motor is dead, and ordered few replacement ones.

Eventually after few months I got some time to play with it again, I was removing the motor, and trying to connect new one (just with hands) to see if it will work, but it wouldn't spin. So I got an idea to plug "dead" motor and new motor in Arduino to see are they operational. But "dead" one was dead for real, and new one was spinning. Which leads me to conclusion, either my tests with the new motor was unsuccessful (though I tried hard), or motor was not only thing to die, maybe "the accident" grilled the board?

What's your bet, is it likely that board died too?

 

[Mike H.]

After any crash at all its always good to re calibrate the quad....its not uncommon to find a motor that wouldnt spin before will spin after a re calibration...If you re calibrate and it still wont spin then i would check the motor using a cheap 1.5v alkaline battery...if it works then its possible the mosfet for that motor has burned up...If it doesnt work then i would suspect the motor or possibly the motor wire connection where it solders to the motor itself.

If a motor is wedged or held back from spinning and you keep giving it throttle that is a good way to burn up the mosfet on the flight board....Youll find many recommend cutting throttle when you know your about to crash to help avoid that problem.