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Crash after fordward on Altitude Hold

Posted by Alberto on July 14, 2015 at 4:58am

Hi,

I´m desperated about this issue. My quadcopter has fall down 3 times about this issue.

My config is, Tarot 650 Sport

8000 mah 4S

Afro ESC 30a

Turnigy 4108 480kv

15x7.5 CF props

2,7 kg AUW

Controller and video with second baterry, 8000 mah only for esc and motors.

The crash vid.

https://youtu.be/u7mIxj63JDo

This happens when i go to full or mid throttle in Altitude Hold mode, then suddenly motors stops and the quadcopter drops as a brick.

I think this issue is related with the inclination parameter Angbst, shows big negative values on crash moment, and Throut values goes to 0 in this moment, but i dont know what is wrong.

Thanks,

2015-07-09 21-05-17.log

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Replies

  • Alberto August 15, 2015 at 3:03pm

    SOLVED!, Finaly it was a ESC sync failure. I've change all to Rotor X 40A and it works fine.

    I did a Autotune and works well.

    Thanks, 

  • Andre K. July 23, 2015 at 12:35pm

    check for sync problems, took a very quick look at RCOUT , and the "motors" were not commended to stop.

    search forum for ESC sync problems, and do some serious testing for that.

    • Alberto > Andre K. July 23, 2015 at 2:25pm

      Thanks, 

      I´m thinking to change my esc to hobbywing xrotor 40a, many people says its work well with my motors.

      I will change all wiring for posible brownout (ground loop) and change esc.

      Waiting for china post, i will comment if this issue will solve.

      • Squeal0 > Alberto July 28, 2015 at 5:04am

        Looking at your video - it also seems like there's a lot of vibration...   have you checked your vibration levels..?

        This can be the kiss of death for APM's..

        • Squeal0 > Squeal0 July 28, 2015 at 11:38am

          3702793861?profile=originalThink you might have a barometer issue..  Have you got the breathable foam over the barometer?

          Your log also shows several GPS glitches... which has no bearing here because you were in Altitude hold mode..but still...

          • Alberto > Squeal0 July 28, 2015 at 3:36pm

            I don't activated IMU log, i dont know if i have vibration, but in the video i see a lot of vibration at full forward, but i dont know if only is the gimbal or all,

            Baro and Gps glich was after chash. I have all the electronics separated from esc and motor battery with other battery. 

            I used 4s for motors and esc, and 3s for rest all.

            In my new build y will put all with 4s battery and BECs.

            New ESC are shipped i waiting still for my new build.

            Thanks for the replies.

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