mini helicopter rc see the description?

mini rc helicopter replacement blades image

adar

look at that vid and tell me what is that spinning thing
http://www.youtube.com/watch?v=guUMvuX7_7Q

Answer
They are the drive gears to connect the motor to the rotor
The small pinion gears are connected to the motor shaft and the large main gears to the helicopter blade rotor shaft like this:
http://www.modifyrcheli.com/wp-content/uploads/2011/09/gear3.jpg

IF you need to replace them, this is what they will look like:
http://img.alibaba.com/wsphoto/v0/467086207/Free-Shipping-RC-Parts-Replacement-Spare-Part-9101-08-Top-Bottom-Main-Gear-for-Double-Horse.jpg

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