Yesterday, on my 3rd flight, I had an esc failure on my mini P47. This model had the motor, and esc in it from a crashed HK Funfighter.
Previously I had complained about the motor sounding like a "bag of spanners" and thought it had a damaged bearing from the previous crash.
Well, this morning, everything became clear - the noise, the esc failure.....
I had a rogue washer just sitting against the windings/magnets, in the back of the motor! So I assume I had a short.
I'll put a new esc in, and I hope everything should then be fine!