Stoppable rotor designs involve the operation of the rotor through very high advance ratios and, thus, large regions of reverse flow as the rotor is slowed. Dual-slot, circulation control airfoils, such as those on an X-Wing rotor, produce useable lift in the reverse flow region. A simple method is developed to determine the critical flight condition where the capability of the rotor to produce lift is minimized. Expressions are derived relating the rotor retreating side mean dynamic pressure (indicative of lifting capability) and the lateral offset of the centroid of that dynamic pressure (indicate of roll moment capability) to the rotor geometry and flight conditions. The critical advance ratios predicted by these expressions are compared with the results from a more sophisticated rotor performance analysis.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Basic Consideration of the Lifting Capability of Stoppable Rotors


    Contributors:

    Publication date :

    1984


    Size :

    20 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Removable and stoppable display

    HARMON MATTHEW J / HIRSCH LUKAS / TAJMAHAR HAKAN Z | European Patent Office | 2025

    Free access

    Investigation of a Stoppable Helicopter Rotor with Circulation Control

    J. D. Ballard / J. L. Mccloud / T. J. Forsyth | NTIS | 1980


    Configuring stoppable floor information set for elevator car of elevator system

    WEI LIEPING | European Patent Office | 2025

    Free access

    CONFIGURING STOPPABLE FLOOR INFORMATION SET FOR ELEVATOR CAR OF ELEVATOR SYSTEM

    WEI LIEPING | European Patent Office | 2020

    Free access