marc.kulhavy
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marc.kulhavy's Discussions

Crash due to uncommanded yaw - log file analysis needed

Started this discussion. Last reply by Calvin May 30. 43 Replies

Can anybody help analysing the cause of this crash?The copter started a test mission without any troubles and after reaching a waypoint, he started to yaw constantly but continued to follow the…Continue

The reason for being unable to upload new firmware is....

Started Jan 25, 2015 0 Replies

...that on some computers (like the one I am using right now), there are some other COM devices like GPS and some broadband adapters installted, which seem to have the option of forcing them into…Continue

Tags: firmware, upload, Pixhawk

We need a disclaimer!

Started this discussion. Last reply by Chris Anderson Sep 3, 2012. 9 Replies

I think we need a disclaimer to publish across the whole forums and store sites attached to this projects.It should be a collection of advises and principles we all should accept to followThis thread…Continue

Tags: Disclaimer

Worst Crash ever, Log analysis needed!

Started this discussion. Last reply by robert fujii Aug 24, 2014. 113 Replies

Hey folks! Yesterday I had my biggest, worst and most scary crash with my 3DR Quad.Our local firefighters had an open day for public and presented their equipment, did some presentations, they had a…Continue

Tags: Log, Crash

 

marc.kulhavy's Page

Latest Activity

Calvin replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Leonard! Thanks so much for taking a look.  Actually a had just fixed a break in the solder joint for the power wire for the number 4 ESC.  I had been doing a compass mot calibration and noticed #4 was intermittent so I investigated and…"
May 30

Developer
leonardthall replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Calvin, It looks like your number 4 motor is lazy. I would check your wires and make sure there are no breaks. I had an issue where one of my wires broke behind the bullet connector solder joint but because of the heat shrink it was in contact.…"
May 29
Calvin replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"I am experiencing a similar issue.  I have had intermittent yaw issues for the past few months.  So frustrating that it has been so intermittent!  As soon as I think I've solved it I end up back in the shop troubleshooting.…"
May 29

Developer
leonardthall replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Syrphus, Sorry, I think those basic calibrations are just pass fail."
Apr 15
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hello Leonhardt, thanks again for your feedback and additional suggestions. I will check the higher rates for Rate_I_MAX.One final question with regard to all the calibrations that are done. Is there a way to see how successful these calibrations…"
Apr 15

Developer
leonardthall replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Syrphus, These logs look fine to me. The copter doesn't have the tightest control I have seen but it isn't having any problems. Vibrations look fine and motor outputs are reasonably balanced. You may want to double your Rate_I_MAX…"
Apr 14
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hello Cala, thanks a lot so far. We did some test flights later again. Switched to different propeller blades (though also composite they are not that stiff like the ones we used before) and wanted to see the effect on the vibes. The vibes did not…"
Apr 12
Cala replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Your vibes looks good but not your att, wait Leonard for better diagnose, perhaps you need tunning now."
Apr 12
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hello Leonhardt, here's the log files of todays flights.  http://www.filedropper.com/logs2016-04-12 I did some interruption testing during mission flights and switched flight modes. Thanks for your help. Greetings. Alex"
Apr 12

Developer
leonardthall replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Syrphus, Please just use the parameter I gave you. You can set it directly in the full parameter list. LOG_BITMASK,192509 If you use IMU_Fast and IMU_RAW you will be logging too much data for a normal SD card and lose the data I want to see."
Apr 12
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"I tried to set the proposed bit-Code using the LogsFlags.exe for Windows.It's not exactly matching the Log options in my MP version but i hope this will give us the data you need.Waiting now for the rain to stop and then go for a new testflight."
Apr 12
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Thanks for the input, Leonhardt. I will do so and post a link to the new LOG-file tomorrow or the day after. Thanks Syrphus"
Apr 11

Developer
leonardthall replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hi Syrphus, Could you set your log bitmask to 192509 and do another flight. You have high rate accel logging turned on and your sd card can't handle that, this means there is a lot of data missing."
Apr 9
Cala replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Great news Syrphus :D ; in this log I couldn't find IMU to see IMU vibes and no Baro Alt too, but you still have something with your clips, follow that, but much better now, it's prefereable a flat line, perhaps It was something with…"
Apr 9
Cala replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"This link is this page ;)"
Apr 9
Syrphus_AWO replied to marc.kulhavy's discussion Crash due to uncommanded yaw - log file analysis needed
"Hello Leonhardt, would you mind having a final look at the LOG files after our changes? http://diydrones.com/xn/detail/705844:Comment:2230570 Thank you very much. Alex"
Apr 9

Profile Information

About Me:
IT Engineer and professional Aerial Photographer at www.luftbildfotograf.de
Please tell us a bit about your UAV interest
Aerial Phography, Photogrammetry, Landscape/Farming Research, 3D-Reconstruction, Digital Elevation Models
Hometown:
Weilerswist

Marc.kulhavy's Blog

Flying at No Mechanical Energy Cost: Disclosing the Secret of Wandering Albatrosses

Posted on September 9, 2012 at 12:00am 4 Comments

I found a very interesting journal article about the flying techiques of albatrosses. It describes their ability to soar extreme distances by using the different windspeeds over the open sea, similar to the flying technique of dynamical soaring we use for hanggliding.



It's in PLOS One …

Continue

This is how we all should tune in our copters...

Posted on December 31, 2011 at 8:00pm 3 Comments

Happy New Year to everyone!

I found this articles while searching methods for effective PID tuning:

http://www.icrobotics.co.uk/wiki/index.php?title=3D_Printed_Quadrocopter#Tuning_the_PID_loops

The method is described here:…

Continue

Comment Wall (1 comment)

At 6:21am on August 26, 2012, Marvin K. said…

Hi Marc,

bitte schick mir deine Nummer nochmal ich hab sie glaube ich ausversehen gelöscht. sorry

:D

mfg

marvin

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