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NASA Aeronautics Research: An Assessment by Committee for the Assessment of NASA's Aeronautics Research

By Committee for the Assessment of NASA's Aeronautics Research Program, National Research Council

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Transparent and collaborative decision support systems Eight R&T challenges received only yellow grades, indicating that ongoing work suffered from minor shortcomings that could be corrected within the context of existing project plans: • • • • • A10. Reducing/mitigating sonic boom (novel aircraft shaping) B2. Ultraclean gas turbine combustors B6a. Variable-cycle engines to expand the operating envelope C8. Structural innovations for high-speed rotorcraft C9. High-temperature ceramics and coatings 24 NASA AERONAUTICS RESEARCH—AN ASSESSMENT • E2.

Demonstrate systems to provide pitch trim and control power at low speeds. Develop new techniques for active twist control of rotors. Demonstrate low-cost, simple flow-control techniques for prevention of leading-edge separation from vertical and/or short takeoff and landing (V/STOL) wings. • Improve wing design and fuselage shaping to reduce transonic cruise drag. Plans for the SFW Project include development of technologies, such as active flow-control and morphing materials, that could enable advanced V/STOL and extremely short takeoff and landing (ESTOL) configurations, but plans do not include research to support other aspects of this challenge.

Intelligent engines and mechanical power systems B4. Improved propulsion system fuel economy B5. Propulsion systems for short takeoff and vertical lift B6a. Variable-cycle engines to expand the operating envelope B6b. Integrated power and thermal management systems B8. Propulsion systems for supersonic flight B9. Advanced aircraft electric power systems B10. Combined-cycle hypersonic propulsion systems R&T Challenges in the Materials and Structures Area C1 C2 C3 C4 C5 C6a C6b C8 C9 C10 Y GG Y Y B GG Y Y B B Y B GG GG GG Y Y B GG B GG GG B Y Y Y B Y 1 Y B Y B B Y 2 1 1 1 2 Y B Y Y 1 1 2 2 1 2 1 1 5 2 1 2 1 1 1 2 1 3 C1.

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