Discussions

Quadrotor crash. All propellers were stopped in the air.

Posted by Hyon Lim on July 28, 2011 at 8:22pm

Today, my quadrotor was crashed.

During the flight, all propellers were stopped suddenly, it goes to ground immediately.

I'm guessing few reasons, but I'm not confident.

The copter configuration was

 1. 'X' configuration

 2. 25C, 2200mAh 3s battery.

 3. Four ESC has BEC functionality, but I only use one ESC's BEC. So 5v was from ESC.

 

And battery was 12v when I checked on ground  after crash.

 

So my guessing is that ESC suddenly draws large current, so voltage is dropped, then Ardupilot board were rebooted. This is my thought.

 

So, if anyone have some guessing, comment please. It'd be really helpful to develop my copter.

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Replies

  • Todd Hill August 7, 2011 at 3:55pm
    Have two quads and Y6 using this method. Been flying the APM this way for quite a while with no problem. As long as BEC doesn't exceed 5V the APM will not draw anymore current than it needs. Someone please correct me if I am wrong in doing this. I used to use only one, but I incurred too many brown outs.
  • Todd Hill August 4, 2011 at 3:40pm

    Sounds like a brown out.  Just Curious, but does the Arducopter power distribution board utilize all of the BECs' from the ESCs', or does it just use one?  I have been making my own PDB for my multirotors with a customized PCB board.  I have been plugging my servo connectors from the ESCs' directly to the APM.  Since using this method I haven't had any brownouts like I was having in the beginning.  My APM gets anywhere from 8-12 amps if it needs it.  

  • Owen Booth August 4, 2011 at 1:38am

    I just had the same thing happen on mine too, still unsure of reason. Broke three legs (custom units), probably from around 100ft.

    modified Quad kit, with 5000mAh battery, 10x45 props, 2.0.38 firmware,

    UAVCrash.mpg

    https://storage.ning.com/topology/rest/1.0/file/get/3692247423?profile=original
  • Developer
    Olivier ADLER July 30, 2011 at 6:54am

     

    Jason, this gives me an idea. On the AVR chips it is possible to detect the cause of a reboot condition.

     

    Would it be possible to implement a fast reboot, checking for the brownout detector reboot flag ?

  • mc_don July 29, 2011 at 4:59am

    have you check your remote?

    in my JR when fail safe active, same time trotle is loss.

    so, now i set my all chanel to hold mode in failsafe setting.

    hope can help your problem

  • Kristian July 29, 2011 at 4:06am

    Same thing happened to me, twice. The reason was aggressive flying, pulling stick to zero throttle and full left yaw, causing disarming of the controller in mid air. Very frustrating watching the thing fall from the sky, trying to arm it before it hits the ground.. :-)

     

  • Ramon L July 28, 2011 at 9:23pm

    Ok it is impossible that the battery goes under 5v since good cells must remain at least 3.1 volts, so 3x 3.1V will be 9.3 V aprox. To eliminate that posibility check your cells Voltage. 

    Check the ESC with the BEC u where using, check if it is conducting to the APM.

    IMO, it could be the BEC 

     

    For a future, dont use the BEC for the ESC,  try to buy one and have it isolated from the ESC's . 

     

  • Developer
    Jason Short July 28, 2011 at 9:19pm

    A log and code version would help, thanks

     

  • Allen Babb July 28, 2011 at 8:41pm

    Some ESC's have an auto-shutdown feature if the battery voltage gets too low... could be one cause?

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