Sectionalized Main Rotor Blade Advanced Design Study
Final technical rept.
BOEING VERTOL CO PHILADELPHIA PA
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This report covers a study undertaken for the advanced design of a sectionalized main rotor blade. After investigation of the whole spectrum of design arrangements, a bolted-together design with field replaceable boxes, L. E. tip and trailing edge was chosen. For direct replacement of existing blades, a bolted design was selected with essentially the same dynamic rotor characteristics of the current production blade. The parameters that were closely matched to achieve this were NATURAL FREQUENCY, LOADS, AND DYNAMIC BALANCE AXIS. A cost increase of approximately 50 percent is indicated over present UH-1H rotor blades to match current design features, utilizing ground rules on inherent and external damage specified by the procuring agency.