3.0.0 RC5 - Fall from 30 meters - Crash log

Dear all,

yesterday my beautiful hexacopter crashed from a 30m altitude. I'm pretty sure all of you know the feeling, and it's part of this hobby. I'm going to fix this, however I'd love to have some insights of why this happened. You know, just to avoid spending another $3/400 dollars or so for the same reasons. :)

We programmed a very simple mission in the mission planner: 3 endpoints, and then on the last endpoint loiter forever.

I:

  • made the hexa take off
  • put it in loiter mode
  • started the mission from the planner.

Once the mission was over and the hexa was in 'loiter forever', I switched mode on my remote from loiter to stabilize, then back to loiter, so that I could take control of it, then made it come near me to try the mission again.

So I started the mission again. This second time, however, when the mission was over and I switched mode on my remote from loiter to stabilize, then back to loiter, the hexacopter instantly fell down like a stone. It looked like if the power had been turned off the minute I switched modes, and it just went down vertically without control.

So sad.

I've attached the last 3 logs of the flights, the last one is when it crashed. Can someone please give me some hints on what went bad? I would love to start doing this again, but without an understanding of what happened I'd feel that this might as well happen again.

Some additional details of the hexa configuration are in the image snapshot attached. I was using arducopter 3.0.0-rc5.

Thank you in advance..

r.

Tiger Motor.png

crashlogs.zip

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Moderator

    My 2c's worth: I'm afraid it looks like you ran out of battery, your voltage at it's lowest (9.64V) aligns with the rapid drop in relative altitude. There's also a voltage spike right at the end typical when ESC's cut off removing the load.

    3692756713?profile=original

  • You got the loiter/Althold/Auto/guided bug. Keep the throttle at center

  • We might be talking different symptoms then.  Mine was more of a very fast descent into the ground instead of a hard cutoff.  The motors were still active the whole time.

  • I had basically the same thing happen last Friday using v3.0 rc5.  After an autonomous takeoff, my quad made it past three of six waypoints before dropping 50m into the ground.  Luckily it was a relatively controlled drop into thick grass, so there was no damage.

    2013-06-14 13-34-54.tlog

    vlcsnap-2013-06-12-16h37m30s210.png

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @a1k0n: @DanielChiaJH @diyrobocars @circuitlaunch Here's my car's view of that race. About 8.4 second lap times for laps 2 and 3... both…
17 hours ago
DIY Robocars via Twitter
RT @DanielChiaJH: Great racing against @a1k0n today at @diyrobocars! Pretty cool to both break sun-9s at the track today I think I got very…
Sunday
DIY Robocars via Twitter
Broadcasting the @circuitlaunch race live now at https://m.twitch.tv/diyrobocars Races begin around 2:00pm PT
Saturday
DIY Robocars via Twitter
RT @a1k0n: ran a huge number of hyperparameter tuning experiments yesterday; now I can train a new policy, far with better quality, in 15 m…
Saturday
DIY Robocars via Twitter
RT @a1k0n: Did I get rid of hand-tuned parameters? Yes. Am I still hand-tuning more parameters? Also yes. I have a few knobs to address the…
Sep 26
DIY Robocars via Twitter
RT @a1k0n: I'm not going to spoil it, but (after charging the battery) this works way better than it has any right to. The car is now faste…
Sep 26
DIY Robocars via Twitter
RT @a1k0n: Decided to just see what happens if I run the sim-trained neural net on the car, with some safety rails around max throttle slew…
Sep 26
DIY Robocars via Twitter
Sep 24
DIY Robocars via Twitter
RT @SmallpixelCar: @a1k0n @diyrobocars I learned from this. This is my speed profile. Looks like I am too conservative on the right side of…
Sep 24
DIY Robocars via Twitter
RT @a1k0n: @SmallpixelCar @diyrobocars Dot color is speed; brighter is faster. Yeah, it has less room to explore in the tighter part, and t…
Sep 24
DIY Robocars via Twitter
RT @a1k0n: I'm gonna try to do proper offline reinforcement learning for @diyrobocars and throw away all my manual parameter tuning for the…
Sep 23
DIY Robocars via Twitter
RT @circuitlaunch: DIY Robocars & Brazilian BBQ - Sat 10/1. Our track combines hairpin curves with an intersection for max danger. Take tha…
Sep 22
DIY Robocars via Twitter
RT @SmallpixelCar: Had an great test today on @RAMS_RC_Club track. However the car starts to drift at 40mph. Some experts recommended to ch…
Sep 11
DIY Robocars via Twitter
RT @gclue_akira: 世界最速 チームtamiyaのaiカー https://t.co/1Qq2zOeftG
Sep 10
DIY Robocars via Twitter
RT @DanielChiaJH: Always a good time working on my @diyrobocars car at @circuitlaunch. Still got some work to do if I’m to beat @a1k0n howe…
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: My new speed profile for @RAMS_RC_Club track https://t.co/RtLb7TcgIJ
Sep 10
More…