Based on a special Fichtel and Sachs flight engine, the prototype of a low noise ultralight drive was developed, while the minimum climb rate of 1,5 m/s could be maintained. The objective was a flyover noise level of 50 dB(A) at a height altitude of 150 m, at maximum engine power. With in depth research work and a great number of actions taken both on the engine and on the airscrew, 60 dB(A) could be achieved. Comparative values measured in a commercial quality label device show how problematic it is to meet the currently established limit of 55 dB(A). It appears that further development work on the drive and the integration into an aerodynamically optimized flight device would allow one to go below the current limit. The objective of 50 dB(A) does not seem achievable at present, if the flight fitness has to be fully maintained.


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    Title :

    Investigation of Actions to Reduce Noise Emissions in Ultralight Aircrafts


    Contributors:
    K. Krappmann (author) / K. Lueck (author) / M. Maethner (author) / U. Meining (author) / H. Schmid (author)

    Publication date :

    1989


    Size :

    145 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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