I have been learning to hover my new HBFP. The stock tail motor died on me VERY quickly, so with the help of Blade-Killer's advice, I did a Direct Drive (DD) tail motor modification. It works very well, and I am back at learning to hover again.
Since the tail motor gave up so quickly, I added a main motor for the FP to a recent parts order. I decided to "run-in" the spare FP main motor so that, when I need to install it, I won't have to spend the time running it in.
Instead of using a AA battery, I decided to use a Regulated DC Power supply I have for electronics hobby use. It was a good thing I did that, otherwise I would never have seen what happened during the break-in of the motor.
I started feeding the motor 2V, and added some Trinity Commutator Break-in drops, and olied the bearings. My power supply has a built-in ammeter, and the motor was pulling between 200-400 mA.
After it ran for a few minutes, I stopped the motor and flushed the bearings and commutator with plastic-safe contact cleaner, blew that out with compressed air, re-oiled the bearings, added a couple more drops of Trinity, and powered the motor back up. When the total run time approached half an hour, the motor started to twitch a little. I had it lying on a piece of terrycloth just so it wouldn't move. I started watching it to see if the twitch was being caused by anything obvious.
Suddenly, the speed dropped, and the current draw shot up to 900-1000 mA. I shut it down and inspected
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