• nontraditional power and propulsion concepts

  • passive and active control of laminar and turbulent flow

  • high-temperature engine materials and advanced turbomachinery

Technologies specifically related to personal air vehicles, uninhabited air vehicles, supersonic aircraft, or runway-independent air vehicles have the potential to improve the performance of the air transportation system, especially in niche areas. However, research in these areas will not be able to resolve the overall capacity problems that are the primary challenge to the continued success of the air transportation system over the long term. Accordingly, the committee did not examine technologies related to these vehicle classes and makes no recommendations concerning the future direction of research in these areas. Nonetheless, the process for change recommended by the committee would facilitate the planning of research for all vehicle types.

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