Calculations of rotational noise and vortex noise loudness levels at distances of 300 and 1000 ft were made for large number of propellers in forward flight of 50 to 200 mph and for engine ratings of 100 to 300 hp; results are presented in chart form.
Propeller-loudness charts for light airplanes
Nat Advisory Committee Aeronautics -- Tech Note
1947
9 pages
57 Supp Plates, Bibliography
Report
English
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Propeller-loudness charts for light airplanes
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