The development of propfan-powered aircraft has been observed with great interest. It is obvious that during cruising flight, the aircraft powerplant (propellers) cause a noise clearly perceivable on the ground. It is the audible frequency spectrum of the propfan powerplants relative to the high tip speeds that presents the problem. A flight test was conducted on 30 April, 1989 at the Frankfurt Airport. Results of the test flight are present.


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    Title :

    En Route Noise of Turboprop Aircraft and Their Acceptability: Report of Tests


    Contributors:
    W. Held (author)

    Publication date :

    1990


    Size :

    20 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English