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Recent content by ezymeat

  1. E

    Strange growl at certain bandwidth range

    I have a DF90A with about 70 hours work on it. Started gettimg a loud 'growl' from the motor at 3200rpm which disappears at around 4000rpm. Doesn't happen all the time - for example I can run at this rpm band for 30 mins with no noise, then I stop in idle for 5 minutes and take off again and...
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