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-   -   grinding noise in outrunner at mid rpm (https://www.rcuniverse.com/forum/ask-expert-sal-electric-airplane-advice-464/11588643-grinding-noise-outrunner-mid-rpm.html)

noffey 10-20-2013 09:19 AM

grinding noise in outrunner at mid rpm
 
I have a Tacan Bigfoot 60 outrunner, that has a grinding noise about midrange in rpms. From 0-4000 it is smooth. From 7000 up it is smooth. The mid range is very noisy and grinding like it is destroying itself. Is it bearings, or maybe bent shaft?


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