easured with microphones of the electrodynamic The last two sources come into operation only under type and their associated amplifiers. The response of special conditions, but the first two sources are always the equipment to sound pressure is known in absolute present. This report concerns itself… … Figure 2.—Motor with propeller mounted. in diameter with two aluminum alloy blades. Details Measurement of the total sound pressure is rarely of the blade sections are shown in figure 1 with the of any value by itself; it is generally necessary to resolve pitch angles adjusted for absorption of 100…
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