PREDESIGN STUDY FOR AN ADVANCED FLIGHT RESEARCH ROTOR

A flight research rotor program aimed at demonstrating significant improvements in aerodynamic performance and reductions in vibration and noise is outlined. The benefits and practical design considerations of approximately a dozen advanced rotor concepts were considered and three concepts were chosen for inclusion in the flight research program. Detailed design of a blade permitting experimental study of tip shape, a tuned trailing edge tab system and blade mass distribution is presented. The design issues addressed in connection with the research blade are shown to have general applicability. Finally the total program required to develop these concepts including further analysis, model test, ground tests and flight test is outlined.