"Aeronautics" Quotes from Famous Books
 ... heated air rushing out of the tail pipe, but I didn't know exactly how much of the noise this caused. If a jet airplane with a silent engine could be built, how much noise would it make? How far could it be heard? To get the answer I contacted National Advisory Committee for Aeronautics Laboratory at Langley AFB, a government agency which specializes in aeronautical research. They didn't know. Neither they nor anybody else had ever done any research on this question. Their opinion was that such an aircraft could not be heard 5,000 ...
— The Report on Unidentified Flying Objects • Edward Ruppelt |
