A flight test program utilizing the Rotor Systems Research Aircraft (RSRA) main rotor balance system was conducted to obtain data for the helicopter configuration. The test program is discussed along with the employed data reduction methods, and the results. NASA 740, the RSRA used for the vertical drag test, was in the standard helicopter configuration. The 31-foot radius blades have a linear twist of eight degrees and NACA 0012 airfoil sections. Aspects of instrumentation are considered, taking into account the data recording system, the static calibration facility, and aspects of data calibration and processing. Attention is given to the test procedure, data analysis methods, balance measurements, the ground effect, and vertical drag. It is found that the RSRA rotor balance system is capable of providing high quality performance data. The vertical drag of the RSRA is 4%, compared to 2.9% predicted.


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    Title :

    An evaluation of vertical drag and ground effect using the RSRA rotor balance system


    Contributors:

    Conference:

    Annual Forum ; 1982 ; Anaheim, CA


    Publication date :

    1982-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English