A study has been conducted to understand the interactional aerodynamics problems occurring during the UTTAS development. Powered wind tunnel model data were organized and analyzed in the following categories of interactions: Rotor/ground; Rotor/fuselage; Rotor/fuselage/ground; Rotor/empennage; and Rotor/empennage/ground. The following related problem areas are considered: Severe lateral trim changes during transition close to the ground; The occurrence of high vibratory aerodynamic loads on the airframe surfaces; Turbulent flow on the airframe near the ground; Excessive low-frequency unsteady loads on the empennage in forward flight due to the hub/rotor wake; and Poor efficiency in tail rotor installations due to adverse fin loading.


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    Title :

    Interactional Aerodynamics of the Single-Rotor Helicopter Configuration. Volume I


    Contributors:

    Publication date :

    1978


    Size :

    304 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English