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A bad AutoTune could do it, but generally a bad AutoTune won't fly at all.  I wouldn't expect it to fly, then flip.

If you post your settings UAV file I can look at the AutoTune results and PIDs.
Vehicles - MultiRotors / Re: Strage crash... flipping over mid flight
« Last post by TALLGUY64 on Today at 05:54:57 am »
I'm still going to look the pid's, anyone know of some good pid's I think I need to drop mine because of the power of the motors.
Vehicles - MultiRotors / Re: Strage crash... flipping over mid flight
« Last post by TALLGUY64 on Today at 05:51:38 am »
I took a lot of time balancing props by sanding them like I used to on my rc plane. At low rpm one at a time I checked for vibration before I flew they felt good. I definitely need to record my next flight, didn't even think about it.

From what I could tell all the motors were working when it drove into the ground, right after I ran the motors to check to make sure nothing was damaged and it fired right up but I was done and it was really getting to dark.

Best way I can describe the flip was as if I yanked the stick hard let up when the was upside down and didn't let of the throttle. Kinda like doing a split s with out throttling down.

From what I can tell no permanent damage besides two broken props.
General Discussion / Re: ESC/CC3D Problem
« Last post by TheOtherCliff on Today at 04:57:51 am »
From what you said, sometimes it works and sometimes not...  So do you know that you tested these things when it was failing?  :)

Plug battery in and check for voltage (red wire vs black wire) everywhere, at each ESC, at FC...

ESCs play "startup beeps" if they see a good (low = motor off) signal when they are first powered on (and if signal goes away and comes back).

Some ESCs beep once each few seconds if they get power, but don't have a signal (like FC without power).

ESCs are silent after the startup beeps if they are getting a good signal, even a "low enough to stop motor" signal.
General Discussion / Re: ESC/CC3D Problem
« Last post by I_drone_about_drones on Today at 04:14:03 am »
Maybe I Need add some more information.
The PDB is definitely working as All the ESCs are getting the correct voltage.
The BEC is working as I checked it with the multimeter and also the vtx and the FPV camera is working.
The CC3D is definitely getting 5V as I checked the voltage right on the CC3D.
When I have the FC plugged into the computer, The CC3D lights seem normal.
My best guess is that the CC3D is fried, although would it still work when you plug it into a Computer.
One question, Are the beeps that the ESCs make When the battery is plugged in controlled by the FC, Or are they ESC controlled. Plane ESCs seem to beep as soon as you plug in the battery and they don't have a FC.
Many possibilities.  The first one that comes to mind is vibration.  Past a certain level it makes the gyros go crazy.  Balance your props.  Log a flight and/or look at the accel scope.  1g is about 10m/s/s.  A normal hover should see about -1g vertically and 0g's horizontally.  If you see vibration that adds more than a few g's to this, it is an issue, and above some level the gyros do go crazy.  The g sensor has a limit and clips above some level, like 8g's or such...  I forget.  Also, when the g sensor starts to clip (past max value) then the g sensor itself can make it flip (but not flip quickly) in self leveling modes like Attitude mode.

Bad connection to an ESC could cause it.

Did it drop when it happened like one motor stopped working or flip first if you could tell?

Did all motors stop at about the same time?

Crash damage of many kinds... FC power lost momentarily.  Cracked FC or BEC.
Vehicles - MultiRotors / Strage crash... flipping over mid flight
« Last post by TALLGUY64 on September 21, 2017, 09:56:28 pm »
hey all,

Just finished building a s500 frame, flying on 4s with 30amp esc with beheli driving 3506 650 kv motors spinning 1245 props all controlled with a revolution using an external gps mag combo. Did all the calibration supper meticulous. Super low mag errors at all angles, never higher then 2% even when standing next to my truck. in the field seemed to be at or below 1%. So i armed bliped the throttle, no roll over, then took off, hovered for a min made sure i could maintain control, switched into autocal, finished and landed and saved the settings, switched over to the new settings was getting dark so kinda hard to notice any slight oscillations, wasn't super happy didn't feel right, but pushed on till.... it crashed. It was the oddest crash i have had yet. I have a small 250 chinese zmr and have done all kinds of bad with that  ;) . I have a feeling it is due to the PID settings but i figured i would ask.

The crash, As i was hovering, not moving it literately did a 180 flip/roll and went straight into the ground. It was about 6 to 8 feet of the ground, no wind just manual hovering in attitude. It happened so fast that i didn't have time to notice which axis it happened in. There was no major oscillations before it flipped, when it did flip it did it faster then i have been doing some flips with my 250  :o

Like i said i didn't like the feel of it, it felt really twitchy. I have over done it with my 250 and i have had some bad oscillations and then a crash because i got out of control. but never had it feel okish then just flip and straight into the ground.i am guessing i should start off from scratch and do manual tuning.

Anyone had this happen or your thoughts? Thanks!
Vehicles - Fixed Wing / Re: Help with TxPID
« Last post by f5soh on September 21, 2017, 07:18:34 pm »
If you want something changing in Stabilization tab you may set some range, this means min and max values different in TxPID tab.

You can also use the EasyTune feature that allow some fixed coefficients, allowing change P and ID numbers at same time with one input.
Maybe do some tuning for Pitch and next, other session for Roll.
Vehicles - Fixed Wing / Help with TxPID
« Last post by rcrichfl on September 21, 2017, 06:32:15 pm »
Gents, I was able to set up and verify operation of the CC3D in Rate mode. Now. I want to take advantage of the TxPID, and I configured following readings and videos, but I cannot get results. I assigned a slider to CH 6, and I can see the input values, but the PID values in the stabilization screen do not change. Attached are some screen shots, that shows what do I have. I am using PWM for all channels, and I have updated the soft as suggested in Libre Pilot.
I think I am missing something, but after trying for two days different configurations I cannot figure out why what it should work, does not.
General Discussion / Re: ESC/CC3D Problem
« Last post by TheOtherCliff on September 21, 2017, 06:17:41 am »
It sounds like you have a broken power system.  Perhaps a crack in your PDB (power distribution board).  Try flexing things with the battery plugged in to see what makes it change.

Another test I would make is to set a meter to the volts scale and connect it from battery minus to ESC minus on an ESC that shows a problem.  That should be a straight wire and thus have 0 volts across it.  If you ever see voltage showing, you have found a problem and can narrow it down.  If no problem found, try battery plus to ESC plus.

What powers your CC3D?  The ESC BECs or a stand alone BEC or a BEC built into a PDB?  BEC built into the PDB could have some crash damage.

The CC3D could also be damaged.  What happens to the CC3D LED when it goes crazy?

I assume you don't use any metal mounting hardware (screws, nuts, washers, standoffs) for the CC3D.
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