A highly-instrumented UH-60A aircraft was tested at NASA-Ames Research Center from August 1993 to February 1994 obtaining an extensive data base for level flight, maneuvers, acoustics (both with respect to ground microphone arrays and inflight microphones), and flight dynamics. A majority of the data obtained are now in an electronic data base, however, only a small fraction of the data have been examined. The proposed paper will examine the issue of hovering steadiness in more detail. In particular, a single set of data obtained during ground acoustic testing may provide considerable insight as the wind speeds were measured at a hover height of 250 feet and the aircraft was positioned in 15 deg. steps in heading from 0 to 180 deg. Also, hover housekeeping data were obtained for many of the 31 flights and these will also allow a characterization of the unsteadiness. The variation in section lift will be examined in terms of the induced flow angle variation and this will be related to possible physical explanations.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Unsteady Aerodynamic Behavior Measured in Hovering Flight


    Contributors:

    Conference:

    AHS 51st Annual Forum and Technology Display ; 1995 ; Fort Worth, TX, United States


    Publication date :

    1994-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Unsteady Aerodynamics and Wing Kinematics Effect in Hovering Insect Flight

    Liang, Z. / Dong, H. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2009



    Optimal Settings of Aerodynamic Performance Parameters in Hovering Flight

    Dong, Haibo / Liang, Zongxian / Harff, Michael | SAGE Publications | 2009

    Free access

    Aerodynamic Performance of a Hovering Quadcopter Using the Unsteady Vortex Lattice Method

    Gordillo, Andres M. Perez / Escobar, Jaime / Poroseva, Svetlana V. et al. | AIAA | 2025