Field test of muffler designed with aid of this method was conducted on helicopter with known exhaust-noise problem. When exhaust noises were compared for hover-flight conditions, muffler system was found to reduce exhaust noise by approximately 11 db. No significant degradation in engine performance was observed.


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    Title :

    Improved method for design of expansion-chamber mufflers with application to operational helicopter


    Contributors:

    Publication date :

    1974-03-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English