Abstract
Data on the characteristics of the noise fields around several jet aircraft during ground runups, and the method of measurement, were reported previously [Adone C. Pietrasanta, J. Acoust. Soc. Am. 25, 140(A) (1954)]. Using the same technique, similar measurements have been made on a number of additional single and twin-engine jet aircraft. These data have been used to develop a design procedure for estimating both the directivity pattern as a function of frequency and the over-all acoustic power level from a knowledge of the jet engine operating conditions. An empirical design curve for estimating the increase in power level for after-burner operation is presented. [This work was supported in part by the U. S. Air Force.]
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