I noticed that the bottom rotor spins slow, and the top spins fast. The motor that spins the top rotor, glides very well, like it's on bearings. The motor the motor that spins the bottom rotor spins slower and is like it is on rusted bearings. It's not smooth and doesn't spin like the other one. Also, once I turn the motors off, the top rotor spins after, the bottom rotor stops pretty quick.

This probably dosn't mean anything, but I think I should try and lube the motors.