The technical community has identified rotor efficiency as a critical enabling technology for large vertical-lift transport (LVLT) rotorcraft. The size and performance of LVLT aircraft will be far beyond current aircraft capabilities, enabling a transformational change in cargo transport effectiveness. Two candidate approaches for achieving high efficiency were considered for LVLT applications: a variable-diameter tiltrotor (VDTR) and a variable-speed tiltrotor (VSTR); the former utilizes variable-rotor geometry and the latter utilizes variable-rotor speed. Conceptual aircraft designs were synthesized for the VDTR and VSTR and compared to a conventional tiltrotor (CTR). The aircraft were optimized to a common objective function and bounded by a set of physical- and requirements-driven constraints. The resulting aircraft were compared for weight, size, performance, handling qualities, and other attributes. These comparisons established a measure of the relative merits of the variable-diameter and -speed rotor systems as enabling technologies for LVLT capability.


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    Titel :

    Technology Assessment for Large Vertical-Lift Transport Tiltrotors


    Beteiligte:
    P. J. Germanowski (Autor:in) / B. L. Stille (Autor:in) / M. P. Strauss (Autor:in)

    Erscheinungsdatum :

    2010


    Format / Umfang :

    80 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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