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Crash after failsafe engaged apm 2.5

Posted by Robert on March 11, 2014 at 9:51am

I had a pretty serious crash on Saturday after a few minutes of flying.  I'm a newb at all of this, but I was able to download the logs and graph them after the flight trying to figure out what the heck happened.  Towards the end of my logs the graphs clearly say Err: Failsafe_Radio-1 and Err:Failsafe_Radio-0.  The distance of the quad wasn't all that far from the launch site so I can't understand why this would happen.  

The worst part was that the quad went about 200-250yrds down field and crashed pretty hard instead of returning home; breaking all four props, motor mounts, gps mount and battery holder.  

I guess the RTL command would be the reason I lost control of the quad.  My biggest question is why would it fly so far away and crash so hard with what appeared to be a GPS lock before the initial take off?  Also, if anyone could examine the logs I have attached could you tell me if anything else happened maybe that I need to fix or debug??  

2014-03-10 21-58-27 53.log

2014-03-10 21-58-27 53.log.gpx

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Replies

  • Joe Thompson March 20, 2014 at 7:10am

    Robert, I just had a VERY similar situation. I do not have much to offer, aside from saying that you're not alone. Glad you were able to generate some feedback, because I received almost none.

    I am also suspicious of my radio, what kind were you using? I've got a FS-TH9X with default receiver. I have not been able to recreate the throttle dropouts at close range, I plan to try a longer range this weekend. Hope you can find out if the frsky module resolves the issue.

    I've got more info on my writeup here: http://wrlab.com/1st-catastrophic-crash/

    • Steve St.Clair > Joe Thompson July 4, 2014 at 4:00pm

      Hi Joe

      I have been browsing thru some throttle in dropout issues since I have been experiencing them as well.

      Check out my posts if you are interested.

      Cheers, Steve

    • stevejoslyn > Joe Thompson June 27, 2014 at 4:24pm

      3DR Y6 with Spektrum DX7

      I've been having problems with RTL mode for about 2 months now. I don't trust it at all now.

      Somewhat recently the RTL phase remained hovering at 5m for like 20sec (much longer than parameters state). Then it began descend but started to act erratically, rocking forward and backwards with props going crazy or visibly stopping for a moment. Then it tried to fall forward and crashed.

      Missions, stablise mode and alt hold all work fine.

      I had a workaround with landing while in Loiter but now that too is showing erratic behavior.

      This has happened to a colleagues X8 recently and we are baffled as to why.

      Hopefully others can help here. Or maybe 3Drobotics

    • Robert > Joe Thompson March 20, 2014 at 8:18am

      I was using a dx6i with an orange receiver.  Since the crash I was able to order a frsky taranis and x8r receiver.  Can't wait to actually get to try it out with the quad in the air.  Waiting on the slow boat from China to deliver my repair parts!

  • Eddie Weeks March 19, 2014 at 8:04pm

    I noticed the current went way up right before the copter went down...

    3701688700?profile=original

    • Joe Thompson > Eddie Weeks March 20, 2014 at 7:11am

      Eddie, this is a nice looking graph. Was this produced by mission planner? What options are you using to overlay the mode, errors, and time?

      • Eddie Weeks > Joe Thompson March 20, 2014 at 7:52am

        Yes... Mission planner ver 1...  Bottom left... load log file...  select parm on the bottom right...

    • Robert > Eddie Weeks March 19, 2014 at 8:05pm

      Any idea why that would occur?

      • Eddie Weeks > Robert March 19, 2014 at 8:10pm

        Yep.... If an ESC fails... it sometimes shorts out, drawing lots of current...

        Check for a bunt ESC...  What shape is the copter now..

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