Abstract
This paper described the performance test and sound characteristics of helicopter `Tail-Fan` anti-torque system. In this research, Korea Aerospace Research Institute(KARI) developed `Tail-Fan` anti-torque system for a helicopter and carried out performance and sound capturing tests of even and uneven tail fans. The performance test is carried out and the noise signals which are generated during the test are saved with microphones at the same time. The performance test`s results meet the design requirements. Tone-corrected perceived noise level is reduced by replacing the even product with the uneven one.
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