Pimder - welcome to the madhouse...
Have a look at this - sounds identical to what you've experienced.
So it could be one or more of your motors...
Have a look at this - sounds identical to what you've experienced.
However, I have had one of the motors go down! It wasn't obvious what had happened at first - it developed a very strong nose-down trim that required a substantial amount of rear stick to compensate. Then it got worse, and even full rear stick wasn't enough!
When I checked the blade rotation, one blade felt like it had a one way bearing in it - I could rotate it forward, but not backwards! I replaced the motor on that blade, and normal service was resumed. Looks like the brushes broke up in the motor!
When I checked the blade rotation, one blade felt like it had a one way bearing in it - I could rotate it forward, but not backwards! I replaced the motor on that blade, and normal service was resumed. Looks like the brushes broke up in the motor!


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