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POWER TRANSMISSION STUDIES FOR SHAFTDRIVEN HEAVY-LIFT HELICOPTERS
Final rept. for 30 Jun 1964-15 Feb 1965
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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The report covers a 6-month design investigation of transmission system concepts capable of operation in a single-rotor heavy-lift helicopter of 75,000 to 95,000 pounds gross weight. The study covered the selection of engines, considering engine installations utilizing models of four different engines. Specific areas considered in the design included the study of high- speed bevel gears and bearings utilized in the initial reduction stages, high- torque lightweight planetary gearing and bearings, and the design of hypercritical shafting systems. The results of this study indicate that the total power transmission system weight for a single rotor HLH is approximately 8,850 pounds. This weight, which includes all gearboxes, shafting, rotor brake, and lubrication systems, is approximately 7 percent less than the results of earlier studies. The mechanical efficiency of this transmission system is greater than 96.2 percent. Studies of alternate drive concepts including the harmonic drive, the roller gear drive, and redundant power path gearing systems indicate the suitability of the roller drive for inclusion in the HLH transmission system, since this concept may afford a weight saving as high as 10 percent over conventional planetary drives. A comparative reliability analysis of the HLH and a current model aircraft designed for similar mission operation is included.
APPROVED FOR PUBLIC RELEASE