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Q:

Why do some helicopters have tail rotors?

A:

If there wasn’t a tail rotor, a helicopter would spin around in the opposite direction of the main rotor blades. The tail rotor’s main function is to pull against the torque of the main rotor and hold the helicopter straight. But, by varying the pitch (angle of attack) of the tail rotor blades, a pilot can use it as a rudder for steering.

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Categories: Propulsion