During the flare, as the helicopter transitions from forward flight to hover, the tail rotor thrust…
Refer to figure.
During the entire flare maneuver, the tail rotor provides directional stability and the tail rotor thrust acts horizontally. At the beginning of the flare, when the collective is lowered to avoid climbing, non-power pedal input is required to decrease the angle of attack of the tail rotor blades and counteract the yaw towards the retreating main rotor blade. In the final stage of the flare, as the collective is increased to control the descent rate and adjust airspeed to generate lift for a cushioned landing, power pedal input is necessary. This input increases the tail rotor blade's angle of attack and tail rotor thrust, countering the yaw towards the advancing main rotor blade.
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