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5. Findings, Conclusions, and Recommendations
Pages 41-44

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From page 41...
... Either approach requires breakthrough technologies, and turning new technologies into an operational commercial supersonic aircraft is very expensive and takes decades of research and development to satisfy performance, economic, safety, and environmental requirements for aircraft and ground systems. Focusing TABLE 5-1 Commercial Supersonic Aircraft: Three Notional Vehicles NASA's efforts to develop technology related to commercial supersonic aircraft on long-term, high-risk concepts would probably result in a research program that does little or nothing to enable the operational deployment of environmentally acceptable, economically viable commercial supersonic aircraft in the next 25 years or less.
From page 42...
... airframe materials and structures for lower empty weight fractions and long life, including accelerated methods for collecting long-term aging data and the effects of scaling on the validity of thermo-mechanical tests engine materials for long life at high temperatures, including combustor liner materials and coatings, turbine airfoil alloys and coatings, high-temperature alloys for compressor and turbine disks, and turbine and compressor seals aerodynamic and propulsion systems with low noise during takeoff and landing cockpit displays that incorporate enhanced vision systems · flight control systems and operational procedures for noise abatement during takeoff and landing · certification standards that encompass all new technologies and operational procedures to be used with commercial supersonic aircraft The situation is somewhat different for commercial supersonic aircraft with cruise speeds above approximately Mach 2. The most efficient cruise altitudes are higher for higher cruise speeds.
From page 43...
... In fact, even if the HSR Program had been completed, additional fundamental technology development and validation would have been required to prepare and demonstrate that critical technologies were ready for use in a commercial transport (NRC, 1997~. Maintaining a goal of TRL 6 for supersonic research is essential if the results are going be adopted by commercial product development programs.


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