Page:Ruppelt - The Report on Unidentified Flying Objects.djvu/153

 traveling at or above the speed of sound? Jet airplanes don’t fly as fast as the speed of sound but they make a horrible roar. Artillery shells, which are going much faster than aircraft, whine as they go through the air. I knew that a great deal of the noise from a jet is due to the 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 or 10,000 feet away. Aerodynamicists at Wright Field’s Aircraft Laboratory agreed.

I called the Army’s Ballistic Research Laboratories at Aberdeen Proving Grounds, Maryland, to find out why artillery shells whine. These people develop and test all kinds of shells so they would have an answer if anybody did. They said that the majority of the whine of an artillery shell is probably caused by the fiat back end of the shell. If a perfectly streamlined shell could be used it would not have any perceivable whine.

What I found out, or didn’t find out, about the sound of an object moving at several times the speed of sound was typical of nearly every question that came up regarding UFO’s. We were working in a field where there were no definite answers to questions. In some instances we were getting into fields far advanced above the then present levels of research. In other instances we were getting into fields where no research had been done at all. It made the problem of UFO analysis one of getting opinions. All we could do was hope the opinions we were getting were the best. My attempts to reach a definite conclusion as to what the professors had seen met another blank wall. I had no more success than I’d had trying to reach a conclusion on the authenticity of the photographs.

A thorough analysis of the reports of the flying wings seen by the retired rancher’s wife in Lubbock and the AEC employee and his wife in Albuquerque was made. The story from the two ladies who saw the aluminum-colored pear-shaped object hovering