The aerodynamic performance of rotorcraft designed for heavy-lift and high-speed cruise is examined. Configurations considered include the tiltrotor, the compound helicopter, and the lift-offset rotor. Design conditions are hover and 250-350 knot cruise, at 5k/ISA+20oC (civil) or 4k/95oF (military); with cruise conditions at 4000 or 30,000 ft. The performance was calculated using the comprehensive analysis CAMRAD II, emphasizing rotor optimization and performance, including wing-rotor interference. Aircraft performance was calculated using estimates of the aircraft drag and auxiliary propulsion efficiency. The performance metric is total power, in terms of equivalent aircraft lift-to-drag ratio L/D = WV/P for cruise, and figure of merit for hover.


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    Title :

    Performance of Advanced Heavy-Lift, High-Speed Rotorcraft Configurations


    Contributors:
    W. Johnson (author) / H. Yeo (author) / C. W. Acree (author)

    Publication date :

    2007


    Size :

    28 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English