I think I may have figured it out. Its only when I turn on plane. It did it again Sunday and I noticed it was when I turned on plane and the motor cavitated and it did it. I will check it again when I come back in 14 days in the mean time I want to order a new prop. I have a 3 blade will a 4 blade give me better performance or should I stick with a 3 blade as a back up
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