I am DESPERATELY trying to figure out why my hexacopter won't fly level in stabilize mode (not altitude hold, just regular stabilize).  Please please please help!  I'm using a Pixhawk.  The hex flew fine on an old frame, then, I moved to a new frame and all of a sudden stabilize mode won't work.  I didn't change anything!  Double checked that motors are laid out correctly and spin the right way!

When the copter takes off it's very "swirly" and unresponsive.  I tried upping the values in the PID loops but this didn't seem to help at all.  Strangely, when it takes off, it does so level, but then over the course of a few seconds I feel like I have to deflect the sticks more and more to keep level.  And then eventually I cannot deflect the sticks anymore and just tips one way and crashes.

After tuning didn't work I then used mission planner to reset the parameters to their default values, thinking that I may screwed something up that I didn't know about.  No luck, same behavior.

I've attached three logs from these flight attempts.  I'm at a total loss for what's wrong.  If anyone could identify a possible culprit I would be very grateful!

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So it looks to me like the vibrations are insanely high, but I'm not very good at reading logs.  Can someone confirm this for me?  That would be strange since the Pixhawk is mounted on vibration-dampening gel, so I'm not sure why it would be that bad.

But for starters, does my hunch about vibrations look right, judging from the logs?

I did not check your logs, but the symptoms indicate exactly that.

Props balanced? Motor mounting loose?

Peter

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