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How do you know when brushed motors are dying?
#1
Upgraded to some of the 17,600kv motors and have flown them quite a bit.  Last week I noticed I was getting horrible battery life and 1 motor wouldn't spin up right away with the other 3 (but did by takeoff).

I swapped that one out and now it spins up the same as the others, but I'm still getting horrible battery life compared to before.  Now I'm having to use 70% throttle almost from the beginning.

Do I need to replace all 4 motors?  How do you know when to replace these things?
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#2
I noticed one of my motors getting much hotter than the others before it started exhibiting the same issue, not spinning up at the same time... 2 days later I replaced it when it stopped working all together. I noticed I had messed up the soldering on one of my motors and had left a tiny piece of wire exposed which was making intermittent contact with the other motor pad, this short seemed to kill my batteries very quickly!

One of my 8.5x20 Racerstar motors had one of the wires pulled out from the bottom of the can, I replaced it with one of the 8.5x15mm motors that came with this prop & motor combo and the quad seems to hold up ok but this motor gets much hotter than the others, I dont expect it to last long...

in summary - Its possible that as the motors heat up and the metal expands that it is creating a short within the motor, giving you bad battery life? How hot are the motors after a flight?
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#3
I'll have to check tonight, but I'm using a BeeBrain board so I didn't do any soldering on it. Doesn't seem likely that a short would suddenly develop (though possible).
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#4
Generally the performance slowly goes down hill... less flight time, less punch, and gets very hot!
What I normally do is to measure the flight time when they are new, when I get lower than 60/50% of original flight time then I will replace them all...
But it takes a very long time for this to happen on mine Smile I normally break something else like the frame or FC before I even replace the motors..
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