I know, I am not the first one with this problem. I am flying in the stabalize mode, I downgraded the P value in stabalize but it's still flipping on take off. I am using a 4S lipo and flying with 9" x 4,7 props. On the other side, when I am flying with a 3S lipo, the APM flies perfect. 

I think this is very weird, because this started a few days ago and before that I made another 10+ flights without having any problems. Does someone of you know what else I can do to solve this problem? I did not change anything on my setup. 

I don't know what to do anymore.

Could this device solve my problem? https://store.3drobotics.com/products/apm-power-module-with-xt60-co...

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What are you P values for the 3S and 4S? The power module only helps with powering your APM and allowing you to monitor power. I fly both 3S and 4S and I have drop P value for 4S. I've never had a flip problem, only when I mounted the APM wrong or put my props on wrong.

I thought maybe the APM is powered by the ESC and is not giving a constant voltage or something like that. The problem is, I did not changed anything on the configuration. It worked before and now he starts flipping. I have this problem in stabalize and loiter.

This is my configuration:


I have added some logfiles, I still don't know whats the cause of this. The first flight went well, a bit wobbles. After that I disconnected and reconnected the battery to test, after that reconnect I am having the same trouble as before.

Could it be a hardware defect?


Check your props! Make sure they are on correctly (not upside down, the props are spinning in the right direction and the correct prop (CW or CCW) is on the right motor)

If it flies OK with 3S, it is obvious that the P, I and D are too "violent" for 4S.

I'd start by dropping Stabilize P to 3, Rate I to 0.075 and double Rate D to 0.0080.


and Rate roll P down also, maybe 0.05 or so, and Rate I should be much lower than Rate P. You have quite high kv motors? They are tricky to tune.


I am using 980kv motors, SunnySky. But I still don't understand why it worked wonderfull a few days ago and now I have this problems.

I will test this configuration.

Any joy with this? I am having a similar situation. 3s with 2836 1000, various props, 845, 134, 1147, 845 tri bladed. H4 frame from HK. 9XR with FRSKY. I am building another similar quad when I get the time to test duplicated hardware and double check prop, esc config etc.

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