THE flow of air relative to a blade element during translational flight of a sustaining rotor periodically varies, the speed normal to the blade tip being Rω + V sin ψ, i.e., Rω + V in the transverse upstream position and Rω − V in the opposite position downstream (Fig. 40). This dissymmetry of relative air speed produces a corresponding dissymmetry of lift, unless the blade angle is sinusoidally varied or feathered (see ref. 41), and if there were no flapping hinge at the blade root the dissymmetry of lift would produce a rolling couple increasing with forward speed. The rolling couple could, of course, be balanced by controlling the rotor lift vector laterally with respect to the aircraft's centre of gravity or by aileron control, but the flapping hinge, besides suppressing this couple, relieves the blade from excessive bending at its root.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Rotary-Wing Aircraft


    Subtitle :

    The Fifth Article of a Series Summarizing the Current State of Knowledge


    Contributors:

    Published in:

    Publication date :

    1940-05-01


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    ROTARY WING AIRCRAFT BEARING FOR ROTARY WING AIRCRAFT MOTIONS

    HALLADAY JAMES R / SHERIDAN PATRICK M / DOWNING MARSHALL W et al. | European Patent Office | 2019

    Free access

    Rotary wing aircraft bearing for rotary wing aircraft motions

    HALLADAY JAMES R / SHERIDAN PATRICK M / DOWNING MARSHALL W et al. | European Patent Office | 2020

    Free access

    ROTARY WING AIRCRAFT BEARING FOR ROTARY WING AIRCRAFT MOTIONS

    HALLADAY JAMES R / SHERIDAN PATRICK M / DOWNING MARSHALL W et al. | European Patent Office | 2015

    Free access

    Rotary wing aircraft

    SUZUKI YOICHI | European Patent Office | 2023

    Free access