Very hard landing (crashed landing gear) when RTL after 10 minutes succesfull maiden flight

@alpa2009 wrote:

Hi,
I did my first flight with a pixhawk (original) controlled 12 motors dodeca hexacopter. All went well (stabilize and Poshold modes) until I tried to land with RTL mode. It went to approx 20 meters (which it should) then got to RTL location and start to decent... then it went wrong. For one reason or the other my hexa suddenly dropped and before I could react with going to stabilize and giving full throttle it basically went thru it's landing gear... no other damage but it was really falling... I have the latest versions uploaded and it is not my first build... it is however my first crash hence my novice level of experience with the logging... I looked myself and noticed the following "strange" symptoms:
- at the moment of crash: CTUN.Alt -3m? while GPS.Alt has an continue delta of 4 to 5 meters with CTUN. BARAlt
- CURR.VCC looks normal with the exception of dropping after 6 minutes of flight without any problems

would highly appreciate if somebody can take a look at my logging, or give me some advice in what direction I have to look... I did already check the Readme first of this topic.
https://www.dropbox.com/s/sa3cpkhebtqj525/2016-08-24%2007-13-48.bin?dl=0

Thanks,
Pascal

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