The traditional method of determining the net thrust of an engine in cruise is explained. It is shown to result in a satisfactory net thrust uncertainty for jet and low bypass ratio engines but to be unsuitable for high bypass ratio engines. A redefinition of net thrust results in a new thrust determination method, called continuity method, which yields acceptable levels of net thrust uncertainty. The new method no longer requires supporting tests in a simulated altitude facility. The question is raised whether in future programs the demonstration of guaranteed cruise performance of an engine should not be carried out in flight tests rather than in an altitude test facility.


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    Title :

    High Altitude Performance of High Bypass Ratio Engines - an Airframe Manufacturer's Point of View


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Aeronautic and Space Engineering and Manufacturing Meeting ; 1969



    Publication date :

    1969-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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