FEASIBILITY STUDY OF ADVANCED V/STOL PROPELLER TECHNOLOGY
UNITED TECHNOLOGIES CORP WINDSOR LOCKS CT HAMILTON STANDARD DIV
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A feasibility study of advanced VSTOL propeller systems for the 1970-1975 time period was conducted. The primary objective of the study was to investigate the application of new materials and new design concepts to define the maximum reductions in specific weight of the complete propeller system including reduction gearbox attainable in this time period. Preliminary designs of future propeller systems presented in the report are over 50 percent lighter than comparable present-day VSTOL systems. Three integral gearbox propeller systems, with and without cyclic pitch and with and without a cross- shaft drive pad, were defined in this report using the advanced technology indicated as feasible by the study. Each major component of the IGB propeller system was optimized and then merged into complete system designs. A summary weight tabulation is presented showing the relative contributions of each major component of the propeller system to the total indicated weight reductions. A significant portion of the weight reductions is shown to be achievable by 1970, since the technology required is presently under development or is a natural extension of existing technology. Other significant weight reductions, such as those resulting from the use of boron blade spars and titanium gearing, are at an early phase of their technology development and are, at this time, not considered attainable much before 1975.