I'm sorry to hear that, I have been watching the crash list of APM for a while before I invest in a new skywalker 2013 and fit APM in it, Its a shame to hear about so many crashes,
All (or most ) of the ones that I have seen seem to be either stall related or the plane gets into a spin and takes a dive.
If someone can confirm that people are doing things wrong maybe there should be a sticky made to help us all prevent it.
Im glad no serious damage was done, sorry I cant help you with the log,
Can you upload the flight's telemetry logs? This resembles the "toilet bowl" affect caused by compass interference.
Thanks a lot for the help, I can not fly before I find out the reason.
Here is the Tlog, just need to see from 90% of the log to the end. the beginning part is other flight before.
I am using pixhawk onboard compass, I did not connect 3DR GPS compass module. It is better use that compass module ?
One more question, why you need check Tlog? I suppose bin log on board have complete information, am I wrong ?
I do not see the compass interference problems like those described at http://www.youtube.com/watch?v=4E0jKcuMRWA , but your problem sure resembles compass interference as described in the docs.
Hopefully someone else can add some analysis to the discussion.
I wanted to look at the tlogs only so I didn't have graph in Excel.
Dataflash log’s COMPASS message hold the compass’s raw x, y and z axis values (called MagX, MagY, MagZ) which are equivalent to the tlog’s RAW_IMU xmag, ymag and zmag fields. It’s possible to calculate the mag-field length by first loading the dataflash log file into excel, filtering by the COMPASS message and then calculating the mag-field using the formula mag_field = sqrt(MagX^2, MagY^2, MagZ^2). Note that the COMPASS message is not enabled by default in the dataflash logs because it runs at 50hz and does affect CPU performance a bit.
Thanks for explanation. hope someone can help me to do some analysis on this issue.
another is that GPS+compass module will be better than pixhawk on board compass ?
Please someone do help....pixhawk, with APM I never have this problem...