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Sound pressures of the first four harmonics of rotation noise from a full-scale two-blade propeller were measured and comparison is made with values calculated from theory. The comparison is made (1) for the space distribution at constant tip speed, and (2) for fixed space angles with variable tip speed. A relation for rotation noise from an element of radius due to Gutin is extended to cover the entire propeller disk. Curves are given showing the effect of number of blades on the rotation noise.
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A. F. Deming (1940) studied this question.
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