The NASA Quiet Engine Program will incorporate all available noise-reduction technology into a propulsion system suitable for subsonic civil transport aircraft. Full-scale experimental hardware is being built and tested primarily for noise performance. The program is in process, and component and engine tests to date indicate that it is possible to achieve or exceed noise reduction objectives of 15–20 PNdB below the levels of 707/DC-8 long-range transport aircraft.
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The NASA Quiet Engine Program
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Kramer, JJ, & Montegani, FJ. "The NASA Quiet Engine Program." Proceedings of the ASME 1972 International Gas Turbine and Fluids Engineering Conference and Products Show. ASME 1972 International Gas Turbine and Fluids Engineering Conference and Products Show. San Francisco, California, USA. March 26–30, 1972. V001T01A095. ASME. https://doi.org/10.1115/72-GT-96
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