Complete Shutdown at high alt. Can't figure out why.

I was flying my Trex 450 trad heli with an APM 2.6 running 3.0.1.  I was doing auto takeoffs.  20% of the time these result in uncontrolled climbs so I was trying to tune out the throttle.

This time it took off and I let it go.  It hit the 85ft altitude fence and kept going to about 160 ft.

Then, the motor quit.  As it fell, I noticed the lights were still on but no motor power and no control.

When it hit, the APM was still receiving power but still no GCS contact.  I had to recycle the power to get the system to respond. (worked normally)

As I looked at the logs, both the GCS and onboard logs show the climb and then nothing.  Neither show the descent.  Neither show a throttle down.  The only error was two alt fence breaches. I've ruled out any power problem.  Good volts all around on a fresh battery.

I can find nothing that indicates a problem except the Nlon count was climbing during the flight to a max of 85 before failure.

Any clues?

Good news is that the damages were limited to blades and nothing a little glue can't fix.

2013-12-13%2016-45%2058.log

2013-12-11%2017-02-15.rlog

2013-12-11%2017-02-15.tlog

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

Join diydrones

Email me when people reply –

Replies

  • Hi Ray,

    I had a look, unfortunately I can't see any reason for the brown-out at all.  Not saying it didn't happen, clearly it did as the log just stops.  But I just don't have any data to tell you what the cause was.  Vcc is slightly noisy, and slightly low (how are you powering it?) but nothing that should cause a failure.

    As for the flyaway altitude... I'm not sure what's going on there yet.  You have a sonar plugged in?

    Have you ever looked at the vibration on this heli?

This reply was deleted.

Activity

DIY Robocars via Twitter
Apr 27
DIY Robocars via Twitter
Apr 27
DIY Robocars via Twitter
RT @f1tenth: Sliding (autonomously) into the weekend like ... 🤖😎 #f1tenth #robots #AutonomousVehicles @OpenRoboticsOrg @NVIDIAEmbedded @Aut…
Apr 25
DIY Robocars via Twitter
RT @chr1sa: One of the problems with autonomous car racing is that watching software drive is not a very exciting spectator sport. To help…
Apr 25
DIY Robocars via Twitter
RT @SmallpixelCar: Replaced AGX Xavier with @NVIDIAEmbedded Jetson Xavier NX. Now both cars look fast and clean https://t.co/jlcoY2EjZf
Apr 25
DIY Robocars via Twitter
RT @chr1sa: Yesterday we had a record number of competitors (36) in our monthly @DIYRobocars virtual autonomous car race. We kept it going…
Apr 25
DIY Robocars via Twitter
Apr 16
DIY Drones via Twitter
RT @chr1sa: After more than a year of only virtual races, @DIYRobocars returns to the newly renovated @circuitlaunch on May 22 for the resu…
Apr 11
DIY Robocars via Twitter
RT @DAVGtech: And now available with LiDAR 🔥 https://twitter.com/Heavy02011/status/1381137016381964293
Apr 11
DIY Robocars via Twitter
RT @Heavy02011: #VirtualRaceLeague: @DIYRobocars Race #9 - #ParkingLotNerds #thunderhillracetrack, CA Join us for the next race April 24th,…
Apr 11
DIY Robocars via Twitter
RT @DWalmroth: Weather's finally cooperating, looking forward to racing 1:10 scale autonomous cars outdoors again! @diyrobocars, @NVIDIAEm…
Apr 7
DIY Robocars via Twitter
RT @AIDRI_: I finally succeeded in optimizing the trajectory and speed of a car on a #racetrack. Next step: implement a 2d controller and…
Apr 7
DIY Robocars via Twitter
@jetdillo @circuitlaunch Actually the second *in person* event in a year. We do virtual races every month
Apr 2
DIY Robocars via Twitter
Update: we're moving it back one day to Sunday (the 4th) at 11:00am instead
Apr 2
DIY Robocars via Twitter
@GrantEMoe @circuitlaunch Update: we're doing it on Sunday (4th) at 11:00am instead
Apr 2
DIY Robocars via Twitter
RT @chr1sa: Maybe we should have a mini @DIYRobocars race in our lower school's playground https://t.co/xLFeua1R6X
Mar 29
More…