What is the tendency of a single-rotor helicopter to move laterally during hovering flight, also known as tail rotor drift?

What is the tendency of a single-rotor helicopter to move laterally during hovering flight, also known as tail rotor drift?

• A. Translating Tendency
• B. Translational Drift
• C. Hover Drift
• D. Yaw Drift

Answer: (A)

When a single-rotor helicopter is hovering, the need to counter torque with the tail rotor creates a horizontal influence on the airframe. The tail rotor thrust, rotor wash, and any crosswind cause the fuselage to tend to move sideways relative to the ground. This natural drift is called translating tendency. Pilots compensate with slight cyclic input to hold position and small pedal adjustments to maintain heading. So translating tendency is the standard term for this lateral drift in hover.

When a single-rotor helicopter is hovering, the need to counter torque with the tail rotor creates a horizontal influence on the airframe. The tail rotor thrust, rotor wash, and any crosswind cause the fuselage to tend to move sideways relative to the ground. This natural drift is called translating tendency. Pilots compensate with slight cyclic input to hold position and small pedal adjustments to maintain heading. So translating tendency is the standard term for this lateral drift in hover.