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Rotor Blade Design For a Fan-Jet-Powered Heavy-Lift Helicopter
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English
Abstract
The many technical considerations involved in the design of a lightweight, simple, and inherently fail-safe rotor blade for use on a large fanjet-powered Heavy-Lift Helicopter are the basis for this paper. The structural design is oriented toward minimization of dynamic loads response, both as seen by the blade and as transmitted to the airframe and to the rotor controls. Unique to this blade design is the need to perform as a fanjet propulsion duct simultaneously with the other conventional rotor blade functions. Pressurization and thermal effects must thus be considered in the overall technical picture, as well as duct area and hydraulic diameter considerations. The propulsion gases under pressure act to provide inherent damage indication for the primary structure. The low dynamic response and the simple notch-free structure are expected to provide excellent fatigue life. Thermal environment permits use of all major rotor blade structural metals except aluminum alloy. The light blade weight in conjunction with the tip nozzle acts to inherently reduce the coning angle versus blade weight. Cost and maintenance are expected to be competitive with conventional shaft-driven rotor blades of similar size.
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Citation
Smith, H. and Sullivan, R., "Rotor Blade Design For a Fan-Jet-Powered Heavy-Lift Helicopter," SAE Technical Paper 690685, 1969, https://doi.org/10.4271/690685.Also In
References
- Sullivan R. J. “Hot-Cycle Rotor Propulsion” 31st Meeting of the Propulsion and Energetics Panel, AGARD-NATO Helicopter Propulsion Systems Ottawa, Canada June 1968
- Sullivan R. J. Bachmann B. A. “Propulsion Requirements for a Heavy-Lift Helicopter System” 25th Annual National Forum, American Helicopter Society Washington, D. C May 1969
- Smith H. G. “Criteria for Design and Evaluation of Fail-Safe Helicopter Structures” AIAA/AHS VTOL Research, Design, and Operations Meeting Georgia Institute of Technology, Atlanta, Georgia 17-19 February 1969
- Schneider J. J. “The Influence of Propulsion Systems on Extremely Large Helicopter Design” 25th Annual National Forum American Helicopter Society Washington, D. C May 1969
- Smith H. G. “A Comparison of V/STOL Power-Drive Systems From the Structural Efficiency Standpoint” ASME Winter Annual Meeting Los Angeles, California 16-21 November 1969
- Dutton W. S. “Parametric Analysis and Preliminary Design of a Shaft-Driven Rotor System for a Heavy-Lift Helicopter” USAAVLABS Technical Report 66 56 February 1967
- Wax C. M. Tocci R. C. “Study of the Heavy-Lift Helicopter Rotor Configuration” USAAVLABS Technical Report 66 61 November 1966