Measurements of overall soundpressure levels and frequency spectra of noise emitted from 3-blade, 6.85-ft diam propeller; results are compared with similar results obtained from supersonic propeller having advance ratio of 2.2 and from modified propeller having advance ratio of 3.2 (see Engineering Index 1958 p 35 NACA -- Tech Note n 4059 and 4172 respectively).
Noise survey under static conditions of turbine-driven transonic propeller with advance ratio of 4.0
NASA -- Memo
1959
14 pages
Report
English
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