U.S. Supersonic Commercial Aircraft Assessing NASA's High Speed Research Program (1997) / Chapter Skim
Currently Skimming:
A LIST OF FINDINGS AND RECOMMENDATIONS
A LIST OF FINDINGS AND RECOMMENDATIONS
Pages 127-141
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From page 129... ...
These technologies must lead to an environmentally acceptable, economically viable aircraft, with safety levels equal to or better than future subsonic transports. Successful completion of the NASA and industry programs will provide the technology foundation industry needs to proceed with the design, certification, and manufacture of an HSCT.
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From page 130... ...
The goal of the HSR Program is to provide the technology foundation that industry needs to make an HSCT product launch decision. Without an extended period of technology maturation and advanced technology demonstration, the HSR Program will not achieve this goal.
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From page 131... ...
Major Recommendation 9. The HSR Program should develop a more comprehensive testing and risk mitigation strategy for the combustor that extends into the recommended technology maturation phase and includes combustor testing in a full-scale demonstrator engine.
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From page 132... ...
The HSR Program should ensure that the flight deck system concepts under development can provide a level of safety superior to conventional systems used by subsonic transports. To ensure flight tests are successful, preliminary flight tests planned during Phase II of the HSR Program should be supplemented by additional flight tests during the proposed technology maturation and advanced technology demonstration phases.
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From page 133... ...
The key product and process characteristics with the highest risk are engine emissions, engine service life, airframe service life, range, affordability, community noise, APSE phenomena, and manufacturability.2 Finding 2-7. Most of the advanced technologies the HSR Program is developing to support an HSCT product launch decision are very process dependent, especially from the point of view of affordability.
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From page 134... ...
Early in the recommended technology maturation phase, which would follow Phase II, the HSR Program should manufacture and destructively test representative full-scale disk components to verify that manufacturing technologies are feasible and that measured material properties are consistent with design data generated from small samples. Disk performance should be demonstrated in a full-scale engine later in the technology maturation phase.
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From page 135... ...
The HSR Program should fabricate and test full-scale nozzles during the recommended technology maturation phase to validate nozzle manufacturing technology, noise levels, and material performance. Finding 3-5.
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From page 136... ...
HSR Program managers and airframe industry executive managers should meet with material suppliers to solicit financial and technical commitments to participate in the overall effort to develop materials needed for an HSCT. The HSR Program should also ensure the ability of foreign industry to reduce risk in critical areas is adequately considered, either through the independent actions of industry participants in the HSR Program or through direct action by the HSR Program (after obtaining necessary exemptions to NASA policy restrictions on the involvement of foreign industry)
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From page 137... ...
The NASA and industry participants in the HSR Program should jointly place greater emphasis on the development of manufacturing technology and producibility demonstrations so the HSR Program can properly support the HSCT product launch decision. NASA and industry should develop an integrated manufacturing technology plan that enables the HSR Program's materials technology development efforts, which currently seem to be focused on nearterm component fabrication, to adequately consider overall, long-term manufacturing issues.
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From page 138... ...
During Phase II, the HSR Program should concentrate more resources on developing structural design tools tailored for HSCT applications. These tools should include validated materials databases, rapid preliminary sizing tools, validated thermal stress analysis tools, and validated analytical life prediction tools.
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From page 139... ...
Testing of full-scale components should be deferred to the recommended technology maturation phase. Funds allocated for testing fullscale components during Phase II should be reallocated to achieve higher levels of technology readiness in the critical enabling materials and structures technologies, including the following: · materials characterization and life prediction methodologies · rapid, efficient design and analysis tools · robust structural concepts .
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From page 140... ...
The impact of APSE effects on flight dynamics and handling qualities may require changes in the aerodynamic and/or structural design of the TCA that would significantly reduce aerodynamic efficiency and/or increase structural weight, thereby reducing maximum range. Finding 5-3.
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From page 141... ...
Recommendation 5-4. To address flight deck system risk adequately, the preliminary flight tests planned during Phase II of the HSR Program should be supplemented by additional flight tests during the proposed technology maturation and advanced technology demonstration phases.
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