Futaba 10J - Manual (Page 138)

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the pitch of the tail rotor to suppress the reaction
torque (force that attempts to swing the helicopter
in the direction opposite the direction of rotation
of the main rotor) generated by the main rotor
pitch and speed. It is adjusted so that the pitch of
the tail rotor is also changed when the main rotor
pitch changes and reaction torque appears and so
that the nose does not swing to the left and right.
However, when the AVCS mode is used with a GY
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