Aerodynamic Technology for Advanced Rotorcraft—Part II

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Abstract
Aerodynamic technology is reviewed by acknowledging representative achievements of the past, identifying certain areas where future work is required, and presenting selected examples of current activities at United Technologies which are believed to be typical of those required to provide the methodology for the design and analysis of the next generation of advanced rotorcraft. In Parl I, a refined hover performance analysis which couples the wake geometry to the load distribution is discussed. Results from this analysis are compared with the results of other available wake methods. In Part II, the elements of forward flight performance are reviewed with emphasis on the use of variable inflow methods for rotor power prediction, refinements in unsteady aerodynamics and skewed flow, the role of aeroelastic coupling in the design of optimized rotors, and a preliminary assessment of rotor/airframe interference.

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