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HLH AND BEYOND
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Sector:
Event:
Aerospace Meeting
Language:
English
Abstract
Design, fabrication, and test of large high powered helicopter components in the U.S. Army Heavy Lift Helicopter Advanced Technology Component development program demonstrated the feasibility of efficient, large helicopter components and reduced the risk and cost of future heavy lift helicopter development. The components included a 92-foot diameter rotor system, an 18,000 horsepower drive system, a fly-by-wire flight control system, a 35 ton cargo handling system, and 8,000 horsepower turbo-shaft engines.
Bench testing of the large, high power transmissions was not completed and is required to verify the adequacy of the design modifications resulting from the ATC technology development program. Moreover, current design methods were found to be inadequate for large flight weight gears, and new analytical design methods employing finite element techniques will be required for future large aircraft gear design applications.
Extrapolation of the design and manufacturing technologies developed in the ATC program to larger but similar tandem rotor heavy lift configurations indicates that there are no formidable reasons why shaft driven helicopters cannot continue to grow in size. A study comparing shaft driven tandem helicopter configurations with hybrid airship configurations shows the helicopter to be competitive in the logging and containership off-loading applications for which the hybrid airship is being proposed.
The present lack of any heavy lift helicopter development in the U.S. is noted and recommendations made to extend technology development.
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Authors
Citation
Fries, G. and Schneider, J., "HLH AND BEYOND," SAE Technical Paper 791086, 1979, https://doi.org/10.4271/791086.Also In
References
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- HLH Final Report, Hub and Upper Controls September 1977
- HLH Final Report, Flight Control System I Production Recommendations September 1977
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- HLH Final Report, Blade Manufacturing Technology Development September 1977
- HLH Final Report, Cargo Handling ATC Program I Detailed Design, Structural and Weights Analysis, and Static and Dynamic Load Analysis January 1976
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