Quadcopter crash while flying in stabilize mode

Posted by Patrick Leduc on May 14, 2013 at 8:18pm

Hi,

Got a sudden crash on a Quadcopter APM 2.0 firmware 2.9.1b. All motor just stopped. Was trying 3DR telemetry kit and juste changed batterie.

At the first look some at the log files, I found out that the thottle out value become suddenly negative ???.

I joined all my log files if someone could have a look at it to find out what was the problem.

Before flying I did a level calibration and the fly before the crash was pretty stable.

Thanks

Patrick

2013-05-13 21-28 9.log

2013-05-13 19-46-26.tlog

2013-05-13 21-28 9.kmz

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Replies

  • Developer
    Randy May 14, 2013 at 9:33pm

    I've had a quick look at your logs.  It looks like the throttle in goes to zero (but not negative) and the copter comes down.

    3692716224?profile=original

    When I look at the tlogs though i don't see the radio input going to zero but that seems to be because the telemetry link is lost at the same time (or just before) the throttle goes low.  There is a blank spot in the tlogs where the copter seems to have lost contact with the ground station.  When it reestablishes contact the copter is on the ground but from the time_boot_ms field it doesn't look like the APM has rebooted.

    Can I ask, were you doing anything from the ground station when the problem happened?

    Have you checked your radio failsafe by turning off your reciever to see what happens to the throttle channel?  I see you've got the throttle failsafe enabled so I guess you've already checked that it falls below 975.  There's no error in the logs to indicate that this happened though.

    3692716122?profile=originalIn the dataflash parameters it looks like your radio calibration (perhaps done post crash) has the min and max for most channels very close to 1500.  You will have almost no control of roll, pitch, yaw or throttle if you try to fly it before doing the calibration.

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