s true if the high-frequency frequency vortex noise is a maximum. In fact, the MO 130 I/O 90 70 50 40 MO 130 110 90 70 50 Figure 8.—Loudness levels about propeller at five distances. instrument readings are slightly higher than the calcu- components are modulated at the frequency of rota- lated… … Relative humidity in percent The deviations from the calculated loudness levels Figure 9.—Values of absorption coefficient to. at 32 feet are accounted for by a wholly different effect. permitting a better interpretation of loudness levels At this distance the intensity level is so high that recti-…
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