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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 found the…"
May 30, 2016
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.  My latest crash followed…"
May 29, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"If anyone could please help me out here I would be so grateful.  I'm so confused as to why this keeps happening.  I've spent many hours reading the forums and inspecting the hex.  I'm about to replace all the ESC's...  I don't know what else to do.…"
May 28, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"Here is a test flight that behaved normally.  Is it normal for the 1, 3, 6 (green in graph) motors to be spinning consistantly faster than the 2, 4, 5 (blue in graph)?  I see this happening even when there is no yaw rotation (yaw is red).  There…"
May 26, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"It wasn't letting me attach files earlier.  Here are the 2 logs....16-05-17_17-19-00Crash.bin16-05-23_18-43-12SpinCrash.bin"
May 24, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"Ugh - I'm still having the same intermittent problem.  I will have 1-2 successful flights and then it happens again!  Here are 2 more logs.  The first flight went fine at the beginning and then it started spinning out of control towards the end of…"
May 24, 2016
Calvin posted a discussion
I performed a compass motor calibration on my Pixhawk Tarot hex for the first time.  When starting the calibration 1 motor did not start spinning at the same time as the other 5.  I'm wondering if this is acceptable.When arming normally all the…
May 22, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"You're amazing!  It turns out motor number 4 had come loose.  I was so fixated on it being a compass issue that I missed this.  I'm amazed you saw this from the log!
It's still a mystery to me what happened in the second log.  This was from 2 months…"
May 14, 2016
Calvin replied to Calvin's discussion Pixhawk intermittent spinning out of control
"Thanks a ton for looking at this Michael.  I believe the 2 logs show the drone spinning in opposite directions.  Is that correct? The 16-03-07 log is counter-clockwise and the 16-05-07 is clockwise?  
If there were a mechanical problem I would…"
May 10, 2016
Calvin posted a discussion
Hello Everyone - I'm hesitant to start a new discussion but I can't seem to find any information to solve the problem I'm having. I'm very desperate to figure this out! I have a Tarot 690 hex with a genuine pixhawk (v3.3.2). I have flown it about 30…
May 9, 2016
Calvin replied to ThatJoshGuy's discussion Pixhawk BAD ACCEL HEALTH APM 3.2 - collecting data
"Thanks I will try this - sounds like a good practice. I have done 9-10 more test flights. All have gone very well. However, each time I plug in this particular battery things go wrong. My latest try also resulted in random behavior and a controlled…"
Mar 16, 2016
Calvin replied to ThatJoshGuy's discussion Pixhawk BAD ACCEL HEALTH APM 3.2 - collecting data
"Can someone possibly tell me if I have experienced the IMU problem reported here.  I have a genuine Pixhawk that I bought second hand.  I had one successful flight.  Then in my second flight the hexacopter immediately started spinning in stabilize…"
Mar 15, 2016
Calvin replied to Henny V's discussion Toilet Bowl effect
"Just flew my Tarot 690S for the second time and had an immediate toilet bowl in stabilize mode, lost control and tried several modes and maneuvers to bring it down until I finally was able to crash it.  I had recalibrate the compasses before the…"
Mar 8, 2016