Documents / Report
This August 1949 technical report from the US Air Force Air Materiel Command presents Project Grudge's investigation of unidentified flying objects through January 1949. Drawing on consultants including Dr. J. A. Hynek, Rand Corporation, the Air Weather Service and Dr. P. M. Fitts, it explains most of 244 incidents as balloons, aircraft, astronomical phenomena, hoaxes or psychological errors. It concludes the objects pose no direct threat to national security and recommends reducing the investigation in scope.
## UNCLASSIFIED Incident 40 Phoenix, Arizona - 7 July 1947 No astronomical explanation seems possible for the unusual object cited in this incident. This case is especially important because of the photographio evidenced and because of the similarity of these photographs to the drawings by Kenneth Arnold (incoldent p17). The two inoldents are separated by slightly more than two weeks, and, of course, they occurred in different localities. It is, however, perhaps more than coincidence that these two best-attested, entirely independent cases should agree so closely concerning the shape of the object and its maneuverability. The present investigator would like to suggest that this in- oinest, μ60, being one of the most crucial in the history of these objects, be reopened for investigation. The actual observations used by Mr. Rhodes should be examined, and the original negatives preserved. Since, from the size of the image on the photograph, we can have an accurate estimate of the angle subtended by the object, this in conjunction with what appears to be a fairly reliable estimate of the distance, can give us an estimate of the forces and accelerations involved in the tra- jectory described by Mr. Rhodes. (It is unfortunate that a competent investigator was not眶atched at once to "remast the drive" with Mr. Rhodes and to obtain sketches of the trajectory, etc., before details faded from his memory.) It would be important to know at what
Report, from the classic collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 413 pages are in the text index: search them above, or from the library's search.