NASA-Lewis Research Center is investigating a variety of fan-stages applicable for short-haul aircraft. These low-pressure-ratio low-speed fan stages may require variable-pitch rotor blades to provide optimum performance for the varied flight demands and for thrust reversal on landing. A num¬ber of the aerodynamic and structural compromises relating to the variable-pitch rotor blades will be discussed. This paper will present the aerodynamic performance of two variable-pitch fan stages oper¬ated at several rotor blade setting angles for both forward and reverse flow application. Detailed radial surveys are presented for both forward and reverse flow.
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