Flyover and ground/static noise measurements as well as wind tunnel tests on individual propellers of ultralight aircraft led to the identification of the essential noise sources and to recommendations for noise reduction. For undisturbed inflow conditions (tractor propellers) and blade tip Mach numbers below 0.5 the resulting propeller noise is of broadband nature, while above that limit discrete-frequency rotational-noise sources dominate. Additional sources occur with pusher-propeller configurations as a consequence of the disturbed inflow. It is demonstrated that ground/static noise measurements are not suitable for certification testing.


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    Title :

    Aeroacoustic Investigation on the Noise from Ultralight Aircraft


    Contributors:
    H. Dahlen (author) / W. Dobrzynski (author) / H. Heller (author)

    Publication date :

    1987


    Size :

    275 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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