Loss of altitude on 2nd flight

https://vimeo.com/1762899224

Had the hexa out last night for it's maiden flight since updating to 3.3.3 Firmware.. 1st flight went well.. take off in STAB mode and then I checked flight modes were working... and they were...I threw the RTL switch when craft was about 200m out... all worked without hitch..


on 2nd flight I took off in STAB mode and then went to ALT HOLD and then POS HOLD it was when it was in POS HOLD (I believe it was in POS HOLD) that the craft starting yawing to starboard, I did try and correct the yaw, but things just got worse, craft started to lose altitude, I gave it more throttle and then switched to ALT HOLD, and then went to STAB.... after that things kinda went apeshit... craft just fell outa the sky, thank God the landing gear took the brunt of the energy..... managed to eventually land the craft..

I did download the log files and had a peruse of the log in MP... but to be honest here folks I just don't have a "Scooby Doo" as to what I am looking at or looking for here....

be grateful if a more experienced user could have a quick look see if there is anything amiss with the craft when it went nutso on me.... TIA..

about 10sec into video

2016-07-25 19-33-10.bin

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

Join diydrones

Email me when people reply –

Replies

  • T3

    Sounds to me like a mechanical problem like a prop loosening.

  • Many Thanks Brian for your time and patience...

    I have the hexa on the workbench ready to strip down and rebuild....and to double check everything over again...

  • Your vehicle seems to have large oscillations (not commanded) when in stabilize mode towards the end of your flight. Did you have a loose prop/motor/motor arm? It appears to be flying OK until the 4 minute mark, then things get dicey. Also noticed some strange spikes in your DAlt parameter around 4 minutes as well. Vibrations appear to spike about 4.5 minutes in (although that could be the craft hitting the ground, I can't see your video).

    If I had to guess I would say a mechanical failure of some kind, based off of the log (desired roll diverging from actual roll) and the beginning of the log behaving well.

  • Auto or manual, your tune don't looks good, try to check that first.

  • do you mean autotune?, I tried that on my last APM board and it made for a very twitchy and erratic craft... (which was flying fine with default pids)

  • You tune it?

  • nope, no one at all????

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @chr1sa: My review of the new @NVIDIAEmbedded Jetson Xavier NX in robotics and @DIYRobocars applications https://t.co/O7TfJZhiF9 https:/…
9 hours ago
DIY Drones via Twitter
RT @chr1sa: Somehow I missed this, but last week @Nvidia released a new version of its Isaac robot development framework. Lots of new Lidar…
yesterday
DIY Robocars via Twitter
RT @Smartphone89: DonkeyCar Racing League Korea #donkeycar @diyrobocars https://t.co/mDlHDR1d98
Friday
Jørn Ramnæs liked VIDEO LINK's profile
Friday
Mark Harrison left a comment on Moderators
"Wow, Ning2 looks really great on mobile. I had sort of drifted away as my browse-time went more on my phone, so this is great."
Friday
Hank Deucker left a comment on PIXHAWK
"I am sure most will say not again, Pixhawk telemetry. I do need help and all can be reassured that I have spent many hours scouring the net for useful information. I am not new at quadcopter flying, I started in 2012 and have progressed through many…"
Thursday
DIY Robocars via Twitter
https://t.co/rLmFr8M2UK
Thursday
Hank Deucker left a comment on PIXHAWK
"Tomorrow, I am thinking about the wording at the moment."
Thursday
DIY Drones via Twitter
Welcome to the new DIY Drones design!. You may have noticed that DIY Drones looks a little different today. That's… https://t.co/cg2EmeDGMQ
Wednesday
DIY Drones via Twitter
New! Online Training on Drones for Disaster Response https://t.co/brqRuujjY2
May 26
DIY Robocars via Twitter
https://t.co/8EMCvYW6oz
May 25
DIY Robocars via Twitter
RT @OttawaAVGroup: We are going to try something new this week. We will be having a drop-in style meeting Wednesday @ 7-9pm EST. Pop in and…
May 25
DIY Robocars via Twitter
RT @tawnkramer: Thanks Everyone for another fun virtual race! Amazing Ai racers competing head-to-head, Virtual Makers Fair event. Catch us…
May 23
DIY Robocars via Twitter
RT @make: Find out the latest from @diyrobocars at 10am PT from @chr1sa of @3DRobotics on Virtually Make Faire! #makerfaire #maketogether #…
May 23
DIY Robocars via Twitter
RT @Heavy02011: Join us Saturday online: Virtual Race League: @DIYRobocars Race #2 - Parking Lot Nerds https://t.co/aJUu4sdutx #Meetup via…
May 22
DIY Robocars via Twitter
RT @donkey_car: Yay, we are part of the virtual @makerfaire with @diyrobocars. Come see our race or better yet train a model and race with…
May 21
More…