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18 hmm would recoment to flash your esc and fc their is a lot of improvment since the first day´s.
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2 I put in a brand new PDB and only redid the wiring directly touching the PDB and everything works great now. So it must have just been something about my old PDB (which was pretty beat up and corroded from flux and had some missing pads from bad soldering) that was causing the issue.
Hopefully it doesn't redevelop the issue in the coming weeks (and hopefully I remember to clean the flux off my new pdb this weekend).
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2 The problem is back in full force. Took 2 flight days to manifest but it's happening in full again.
On top of that it developed a new problem. I was flying last night in LOS in Horizon mode. Whenever I would give it 100% throttle (even in a small burst) it would start yawing as well and wouldn't respond to any input after I took off throttle. I had to disarm it from 60 feet up in order to avoid flying into my neighbors house. After the next launch I reproduced the problem but was able to disarm then arm again while in the air, and it was flyable again. After that my battery was low and I didn't get anymore testing in.
This was when using the RaceKraft 5051 props. I wonder if they were pulling too much power. I'll have to see if I can duplicate the issue on DAL props this weekend.
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2 No the problem slowly built up over those 2 days. I meant "to fully manifest". At the start it would arm and take off fine. Then 1 time out of 10 it would flip backwards. Then 3 times out of 10, etc until now it's 9 times out of 10 (unless I arm-disarm-arm-disarm-arm).
I have a feeling it's going to be an old and/or broken ESC. I just need to find the time to replace them.
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2 Good news! (I think)
The problem happened again on Christmas day when I went to show my brother-in-law my quadcopter. I decided that night to swap the ESCs like someone in here suggested. During the swap I saw the black signal wire on the ESC (which was under heat shrink) had broken off. Took off the heat shrink and both the white and black wires were very frayed. I bet that there was intermittent contact between them which is why the issue was only happening sometimes (and got worse over time).
I resoldered both wires and the thing flew great immediately after. Here's hoping the problem stays away this time.