Y6 crashed in STAB

Hi everyone,

Hexacopter Y6 has crashed from altitude of 100m, being in STAB mode.

0bvnPnARZD4.jpg

Setup:
HKPilot 2.5, ArduCopter 3.1.3
Homemade frame Y6
SunnySky X2212 980kv
Plush 18A with blheli
Props 10x4.5

Video and logs: on GoogleDrive

Look at the end of the video at 9:20.

As you can see it flew almost fine and suddenly crashed for no apparent reason.

A couple of graphs:

ThrIn vs ThrOut:
q6N3zEyoYrvE.jpg
Roll vs RollIn:
rZ_MCvLUjOTT.jpg

I have insufficient experience to make a conclusion about the causes of the crash. :(
Would appreciate any suggestions.

2014-04-15 21-08-21.log

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

Join diydrones

Email me when people reply –

Replies

  • Would it be a problem for you to grab a USB cable and get a clean, non-flying tlog for me? There's a lot I can get about your current setup from the extra data mission planner provides in its log. Just pick it up, turn it upside down, 90 degrees left, etc... Thanks!

    • Upon inspecting your logs a bit, I'm missing the crucial data that will tell me what happened, but the video you got tells a lot :) What baffles me is the drop in throttle almost exactly when the copter starts to tilt up. Did you cut the throttle suddenly? What radio gear are you using? It could also very well be a problem with your gyros, either from vibration or a board defect. If you can, load the board up on your computer and set the logging to IMU, then pull some data and post it. Also, it seems as though something very drastic happened on the input. How are your failsafes set? I cannot think of a time where your throttlein would drop almost vertically in less than a second without somethig happening to the input. 

      Also, the Stabilizing upside down happens when you roll past vertical. Keep me updated!

      • Austin, thanks for your analysis!
        Yes throttle was cut-off at the moment of flip by a fixed-wing habit :(
        But it was restored instantly. Receiver FS (not APM) was set to center sticks and LAND.
        I don't think it could be a gyro problem. At least the log is perfectly confirms all the moves of a copter that is seen on the video.
        Vibrations... There are some, but 9 mins of stable flight makes me doubt is could be a problem.
        Sure, the copter has some speciality. For example: compassmot about 60%. But that's not so critical for STAB, imho.
        I will look if sensors of the controller is alive and will try to make some non-flying logs.

        • I had an apm 1 that would suddenly have a hardware failure at almost exactly 3:15 from boot. The gyro would physically fail to work at exactly that time. It's possible to be a hardware issue. Keep me posted!

          • Sure it could be a hardware fault. But I'm sure it would be clearly visible in the log.

            I have uploaded a non-flying dataflash and telemetry logs on Google Drive.

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @_JonMyer: 🚨Our 1st AWS DeepRacer Community Race is Underway on http://twitch.tv/aws 🚨 Join us to find out which member of your commu…
yesterday
DIY Robocars via Twitter
Monday
DIY Robocars via Twitter
RT @BackyardRobotcs: After an admittedly long wait, the new Tinymovr R3.3 motor controller is now available https://tinymovr.com 🥳
Monday
DIY Robocars via Twitter
RT @_JonMyer: 🏎 1 hr left before the #AWS #DeepRacer Community 🏎 Top 5 Race tomorrow LIVE on Twitch 1st Place = $50 Amazon GC or AWS Credit…
Monday
DIY Robocars via Twitter
Friday
DIY Robocars via Twitter
Oct 15
DIY Robocars via Twitter
Oct 14
DIY Robocars via Twitter
RT @davidfsmith: Race virtually with The AWS DeepRacer Community Race and then join us on the track to see how your times compare on the ph…
Oct 14
DIY Robocars via Twitter
Oct 14
Hiroki Tanaka liked Hiroki Tanaka's profile
Oct 13
DIY Robocars via Twitter
RT @breadcentric: It's now!
Oct 13
DIY Robocars via Twitter
RT @SahikaGenc: Happy Prime Day! AWS DeepRacer is available at a 30% discount today! @sunilmallya #AWSDeepRacer https://www.amazon.com/AWS-DeepRacer-Fully-autonomous-developers/dp/B07JMHRKQG/ref=sr_1_5?dchild=1&keywords=deepracer&qid=1602609599&sr=8-5
Oct 13
DIY Robocars via Twitter
RT @chr1sa: Printing all the parts for @DIYRobocars https://t.co/ygRxBBBQbi
Oct 11
DIY Robocars via Twitter
RT @chr1sa: Cool new @donkey_car controller app (iOS or Android). Can even do training in-app. Impressive! cc @DIYRobocars https://t.co/XD…
Oct 11
DIY Robocars via Twitter
RT @chr1sa: Drifting with @donkey_car! This is an example of the fully autonomous @DIYRobocars we race monthly now (virtually, in the shar…
Oct 10
DIY Robocars via Twitter
Oct 9
More…