Part I—Constant Chord Blades 1. Summary Rotor/fuselage clearance is the most fundamental design consideration when laying out a new project, and it is essential to estimate this accurately at a very early stage. When centrifugal force droop stops are fitted to a rotor, the design criterion is usually the effect of a sharp-edged down gust impinging on the rotor when it is not generating thrust; for example, whilst running-up on the deck of an aircraft carrier. In this paper the dynamics of blade flapping motion are developed and a method for rapidly obtaining maximum gust deflexion is presented in the form of a Data Sheet (FIG. 5). This enables the maximum deflexion in a gust to be determined with no calculation. The solution obtained is exact; hitherto the only attempts to calculate gust deflexion known to the writer have developed an approximate equation of motion for the blade, and offered the Particular Integral as a sufficiently accurate solution. It is shown in Part II of this paper that this can be very misleading, and undcr-estimates the true deflexion. In preliminary project design, the blade inertia is, of course, unknown. It is shown that this is a function of the coning angle and CL, basic only, probably the two most fundamental design parameters.


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    Title :

    Rotor Blade Motion in a Vertical Sharp-edged Gust


    Subtitle :

    A Study of the Dynamics of Helicopter Blade Flapping with a Method of Deriving Maximum Gust Deflexion


    Contributors:
    Payne, P.R. (author)


    Publication date :

    1954-01-01


    Size :

    5 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Rotor blade motion in vertical sharp-edged gust

    Payne, P.R. | Engineering Index Backfile | 1954


    Rotor Blade Motion in a Vertical Sharp-Edged Gust

    Payne, P.R. | Emerald Group Publishing | 1954


    Rotor Blade Motion in a Vertical Sharp-edged Gust

    Payne, P.R. | Emerald Group Publishing | 1954


    Aerodynamics of supersonic rectangular wing striking sharp-edged gust

    Goodman, T.R. | Engineering Index Backfile | 1951