"I hope I'm posting this in the right place.
I rebuilt my 2013 3DR quad this week and am trying to get it back into service.  It is now all running OK so I attempted auto tune today.  It flies OK but is a bit twitchy in loiter in a breeze.
Question…"

"Peter,
I'm not at all familiar with your equipment. As I suggested above the test to assure your radio CH8 is making it to the APM is to use the radio calibration mode of Mission Planner to see if CH8 changes when you flip the CH8 switch on your RC…"

"Peter,
See my post above in this thread, particularly the part about having to connect a wire from CH7 on the R/C receiver on the quad to the APM CH7 input.  You don't mention the RC controller you are using, but you also need to be sure the switch…"

"Randy,
Good to see you at SF.  Do you know how many ended up in the water by the end?  I had to leave about 1:30PM.
May I ask where the sonar is in AC3.2 for APM?  I've been holding off going to the latest release until I see the sonar will work…"

"Flew in 15 to 20 MPH winds yesterday and the auto tune derived PIDs were very stable. Flew in Stabilize, Loiter, and Circle.  The quad was much less jerky in Loiter than using the default PIDs.  And while I need some more flights to be sure it…"

"I see no one else replied, and I just had success with autotune, so let me toss out a couple of issues I worked through.
I had to connect a wire from the radio AUX2 output pin to the CH7 input on the APM2.5. That gets the signal from CH7 (AUX2) on…"

"Successful auto tune, I think.
Just took advantage of a rare windless day and did a successful auto tune.  The quad flys OK after saving the new PIDs but they are very far from the original default PIDs. See attached picture of the new ones.…"

"Is it possible to change the analog input the sonar is connected to?  0 on my APM 2.5 is no longer working (as tested both with a sonar and a variable voltage power supply connected to that input). The sonar is fine.  If there is a parm that sets…"

"Any ActionPro users out there?
We have one on loan in our 3DR quad.  Video to the ground is very nice.  Problem is powering it.  We put a linear 5V regulator between the 1Ah 3S bat that powers the vid transmitter and the ActionPro and found
1) it…"

"How do you get the graphs of Z axis vib?  The text in this thread says
"Verify that vibration isn't your problem by enabling the "RAW" message through the cli, do a quick flight in stabilize mode and check the Accel Z values."
The section I find on…"

"Can someone suggest the parameter to change so the throttle stick position is about the same in Stabilize as in Loiter?
After updating to the latest firmware, when I go to Loiter from Stabilize the quad takes off rather quickly up.  In Stabilize the…"

"Turns out I had loaded the 8 motor X config firmware rather than the 4 motor.  I just didn't look closely enough at the configurations on the firmware upgrade page.  I've redone the radio cal, ESC cal, and accel cal and will test further."

"Apologies if this has already been posted, but after reading this thread I wanted to report an apparent success.
I set Fail Save on my new quad in the following way, which appears to work testing on the bench without props and watching telemetry…"