Abstract
Measured internal-noise time histories from on-board tape recordings are presented for three different ground-launched rocket-powered space vehicles. Surface-pressure measurements for one of these vehicles are also included. For the vehicles measured, noise of aerodynamic origin was noted to have higher levels and to persist for a longer time than noise from other sources. Particular attention is given to the aerodynamic noise during the exit phase of the flights for which sound pressure levels and spectra are presented over a wide range of Mach numbers and dynamic pressures and for different aerodynamic shapes. The vehicles used in these investigations were launched by the NASA in connection with the development program of Project Mercury.
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