"I would have RTL in another switch that overrides the 3 position switch. 

I have a 3 pos switch to Stabilize, alt hold, and pos hold/loiter. 

My 2 position switch overrides the other for RTL on channel 7/8. "

"I dont understand why we would even ask that question. Why you should not take off in loiter when you are new and are having issues? Because when in that flight mode there are more possibilities that something will and can go wrong... 

Its even…"

"Yes i will as soon as i get a chance to fly its been horrible weather these days in Canada. For pics pls PM me. "

"Its this : 

INS_USE: 0 or 1 

INS_USE2 : 0 or 1

3rd IMU does not exist on pixhawk as you probably know "

"You see 3.3.3 might expose some vibration issues that 3.2.1 does not. If that quad has very good vibration isolation i would say upgrade if you are not sure id say dont do it.  So it all depends on what size quad it is and how good your vibration…"

"@ MArtin your problem sounds like temp related since you leave the pixhawk outside before you fly it can affect the IMU to the point where it wont arm. Try to short the connector, or try to arm indoors with pixhawk being indoors for more than 10 min…"

"temp is a huge factor with the LSM IMU. 

Also how good are your offset values after compass calibration ? 

Try to arm indoor. Also shorting the connector that plugs to the battery has always worked for me but that is just a work around. 

There…"

"Thats enough distance.


Two things i would try ALL you guys here who have this issue.

1. Turn off one of the IMUs and use one then see if the issue persists with 1 IMU or with 2 only. Also that way you eliminate which IMU is causing this.

2.…"

"i agree this individual is making it very difficult to even attempt to help him. He has a set up mind already. Why bother."

"what firmware version are you running ? How cold is outside and how far is the buzzer from the pixhawk. These are important questions to this issue. "

"I think you have a very good set up. My only thing was that i did a alot of experimenting with vibration and found a good set up for the pixhawk. Because carbon fiber props at that length transfer more vibration to the frame than smaller props that…"

"Also i have the same ESC and i never failed auto tune. I have the same frame but different motors 380 KV from tarot. "

"no no Gerhard ur good. Very good. You wrote hobbyKING xrotor but i think you meant hobbyWING. those are awesome for low kv. 

I was replying to fnoop dog lol. "

"ur motors are under powered for a 15 inch prop. Esp if your using 4S. Not that it wont work but thats not an efficient set up.."