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Old 02-07-2012, 03:14 PM
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Mr Ammo
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Join Date: Mar 2006
Location: Beaver Dam, AZ
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Default clunking noise

I have a unique situation when flying large motors.
I am flying a 72 inch Sbach with a mega 160, Castle HV80 and 10 cell 3000mah. 20 x 10 prop

When I fly the model on any downlines, and regulate the throttle to zero then add throttle in the pull out, I get a large clunking noise. Inspecting the motor for play eliminated this as the culprit.

Could the engine with a large prop, free wheel until the esc allows voltage to go to the motor then the motor either break the freewheeling or try to speed the motor up faster? Creating the clunking?
Sometimes the motor will squeal, usually if I move the throttle to full rpm when the motor is free wheeling. Ideas??