Had some issues with my quad flipping over out of the blue and falling to the ground. Turned on motor logs and ran through a couple batteries with no issue on a low stable hover decided to take it on a spin around the block and then, you guessed it,it happened.luckily just broke some props, and need a new cloverleaf antenna.
Tell me what you think, the only thing I see suspect is motor #1 power dropped off, all other motors went up when this happened and she started to flip over. Motor #1 pretty much shut down and had a little spike afterwards. Oddly the quad rolled left when the happened, I would of thought if motor #1 had an issue and stopped spinning it would roll right? Check out the screenshots and even check out the log. I'd like to get this solved and I haven't found a definitive answer on if this is some sort of ESC issue, (It works fine on the bench) It is sporadic. I was running 3.1.2 the first time around and just upgraded to 3.1.3 today when this happened. Don't mind the two spikes around 1800-2500, I did a couple flips. The event occurred about 3200. Video of crash
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[SOLVED] I replaced all 4 ESC and have ran the quad through 5 batteries with no problems. Didn't find out which one it was exactly, but since they are cheap, I replaced them all.
You probably have an intermittent ESC or bad electrical connection for your number two motor. I suspect this because your video shows the death roll to be toward the left. That means a motor on your left side lost power. If you take a close look at your motor plots, you'll see the APM was calling for increased power to your number 2 motor while decreasing the power to number 1 to almost nothing. 3 and 4 seem like they are behaving themselves. This is consistent with the APM attempting to counter a left roll. But it doesn't appear your number two motor was cooperating.
If it's not a bad solder joint or bullet connector, it could be a heat problem with your number 2 ESC. That is, the ESC isn't 100%, but you won't see it until it's run for a while and gets warm. It's always possible it's a bad motor, but motors are much simpler than ESCs and when they go bad it's pretty obvious. ESCs are more sneaky. A static test might be a good idea.
With this, motor 2 looks suspect not motor 1.
The motor logs show only what PWM signals the APM is sending to the ESCs (i.e., what it wants a motor to do). There's no feedback to the APM that tells it what the motor is actually doing. So if an ESC fails and a motor stops spinning, the APM will send out a command for more thrust from that motor. It has no way of knowing the motor is non-functional.
Thats my next step, currently waiting for some new props in the mail. I also ordered some replacement ESC's. I'll post my results.
I'm hoping this can be a thread to help people that may experience the same situation and be able to fix it fast, that's why I was looking for input if anybody has already experienced this before.
Not one person can confirm that It's an ESC issue or motor issue or APM glitch?, anybody, bueller, bueller...?