A method for calculation of free-space sound pressures near a propeller in flight including considerations of the chordwise blade loading

Charles E. Watkins, Barbara J. Durling
naca-tn-3809
Nov 1956


This report presents tabulated values of certain definite integral that are involved in the calculation of near-field propeller noise when the chordwise forces are assumed to be either uniform or of a Dirac delta type. The tabulations are over a wide range of operating conditions and are useful for estimating propeller noise when either the concept of an effective radius or radial distributions of forces are considered. Use of the tabulations is illustrated by several examples of calculated results for some specific propellers.

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