![]() I still couldn't really tell what was actually grinding. ![]() Some local folks said to try re-gluing the loose magnets and see if that was the problem. They would simply slide up and down.none turned sideways or anything crazy. Turns out, several (6 to 8) of the magnets weren't glued down. So I logged on and ordered a replacement motor.ĭecided to sit down and tear into the motor to better understand how they're built and what might be the problem. Keep in mind, this is the stock motor (FMS 4250-KV540). Turn the shaft and the grinding is coming from the motor itself. Take off the spinner and prop down to bare shaft. That evening, I turn the prop and I hear a grinding sound. I brought it in, landed, looked at it, and put her back up in the air for the remaining 90 seconds of battery. I'm not sure how long the previous owner had it, or how many flights he put on it, but on my second battery yesterday (the first two batteries I put through it since purchase) I noticed an odd, high-pitched grinding sound at higher power settings. Just ordered a replacement motor for my new (to me) FMS P-51 Snoot's Sniper.
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