Propeller-noise Charts for Transport Airplanes


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It is emphasized that, if noise reductions are to be obtained or if present noise levels are to be maintained for higher power ratings, future propeller designs should operate at lower tip Mach numbers are currently being used. Single- rather than dual-rotating propellers were found to generate the lowest over-all noise levels for a given number of blades.







Index of NACA Technical Publications


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Technical Note


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NASA Technical Note


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Research Abstracts


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