The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following?

Question

BlackTom AI · Accepted Answer

The tail rotor counteracts the rotational torque produced by the main rotor and provides the pilot with direct control over the helicopter’s yaw (directional) motion.

1) Relevant knowledge points and concepts
- Main rotor torque: As the main rotor turns, it imparts an equal and opposite torque to the airframe (Newton’s third law). Without compensation, the fuselage would rotate.
- Anti-torque/ tail rotor function: The tail (or anti-torque) rotor produces lateral thrust to oppose that main-rotor-induced torque and to control yaw (heading) by varying thrust.
- Pilot inputs: Rudder pedals (or equivalent) change tail-rotor thrust, allowing the pilot to maintain heading or deliberately yaw the helicopter.

2) Step-by-step reasoning
- Step 1: Recognize that the spinning main rotor creates torque that tends to rotate the helicopter fuselage in the opposite direction.
- Step 2: The tail rotor generates a sideways force (thrust) applied at the tail to produce a counter-torque about the helicopter’s vertical axis.
- Step 3: Varying tail-rotor thrust (via pedals) changes the net yawing moment, enabling the pilot to hold or change the helicopter’s heading.
- Step 4: Therefore the tail rotor’s primary roles are to compensate for torque and to provide directional (yaw) control.

3) Calculations
- Not applicable; this is a conceptual mechanics question (no numeric computations needed).

4) Why the correct answer is correct
- “Torque and directional control” directly names the two functions the tail rotor provides: countering main-rotor torque and controlling yaw/heading.

5) Why the other options are incorrect
- “Attitude and airspeed.” Attitude (pitch and roll) is primarily controlled by the cyclic (and collective for vertical) and airspeed is managed by attitude, collective and power—not the tail rotor.
- “Lateral and yaw position.” Lateral control (roll/side slip) is achieved mainly with cyclic inputs, not the tail rotor. Although “yaw” is relevant, pairing it with “lateral” makes the option incorrect.

Conclusion: The tail rotor permits the pilot to compensate for torque and accomplish directional control; the correct answer is “Torque and directional control.”

The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following?单项选择题

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