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This problem is due to the
torque created by the spinning rotor blades and an imbalance in the pitch of
the rotors. If the rotor blades are not matched exactly, the helicopter will
spin in one direction. This can usually be fixed by adjusting the trim on the
transmitter. If it continues to spin with the trim fully maxed out, you can
remedy this easily.
If the helicopter is
spinning to the left, you will have to adjust the top rotor blades by bending
more pitch into them. This is done by carefully bending the trailing (back)
edge of the individual blades down. If the helicopter is spinning to the right,
you can adjust the bottom rotor blades by bending more pitch into those blades.
Use very light pressure to gradually bend the blades.
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