Eflite Power 32 screams at high power settings

by David
(Mint Hill, North Carolina)

I have an Eflite Power 32 which has never been flown, but is a couple of years old. I installed it in a scratch built Cub and took it to the field to practice high speed taxiing, as I am not yet qualified to try to fly this aircraft.

I have a 60 amp ESC and a 13 x 7 wooden prop is installed, all powered by a 2200 mAh LiPo battery. The motor has a high pitched scream at high power settings.

Thinking the bearings might have been defective I ordered and installed a new set of Boca Ceramic bearings. The noise is still present.

I tried resetting all of the motor related ESC settings with no positive affect. There are no clearance issues, and I have not operated the motor long enough to determine if there might be any overheating.

Any ideas?

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Bench test
by: rcdude07

Have you tried it on the bench with no prop on? The type of prop and size of prop can create stress and create unique sounds. There's a difference between a metal scratching sound like bearings and or magnets being thrown/bad versus prop sound. I'm assuming also you balanced the prop and hub. Best thing to do is get a video uploaded to YouTube and send us a link to hear it for ourselves.

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Additional comments
by: Anonymous

I have a 13 x 7 wooden prop, balanced. I have also tried a similar nylon prop. Both yielded the screeching noise. Seems to run smooth without a prop.
Question: is there any type of shims or washers used inside the motor, and if so, where. I just wondered if I lost something when I disassembled the motor to inspect the bearings.

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