During the past few years, NASA's Lewis Research Center has managed a wind turbine project for the Department of Energy. This effort has included the design, construction, and operation of a 125-ft-diam, 100-kW wind turbine at the NASA Plum Brook Station near Sandusky, Ohio. During some of the performance tests, the opportunity arose to make exploratory noise measurements and results of those surveys are presented. The data include measurements as functions of distance from the turbine, and directivity angle, and cover a frequency range from 1 Hz to several kHz. Potential community impact is discussed in terms of A-weighted noise levels relative to background levels, and the infrasonic spectral content. Finally, the change in the sound power spectrum associated with a change in the rotor speed is described.

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