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This optimization of a rotor anti - torque acoustic carene a gene for a rotorcraft, in particular a helicopter, and the rotor anti - torque carene thus obtained.
This optimization of a rotor anti - torque acoustic carene a gene for a rotorcraft, in particular a helicopter, and the rotor anti - torque carene thus obtained.
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机译：旋翼抗扭声传播的这种优化是旋翼飞机，特别是直升机的一种基因，从而获得了旋翼抗扭传播的基因。
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摘要
The present invention relates to a method for minimizing the noise emitted by a device preventing - torque to be ducted tail rotor at a frequency fe and perceived at a frequency fp, according to which it determines the diameter d, the number of blades b and the tangential speed u of the rotor, so that the perceived frequency fp is less than or equal to the lower limit frequency fl of a one-third-octave band of frequencies predetermined and centered on a frequency fc.
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