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Project Blue Book Special Report (second copy)

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This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.

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“disappeared”14 pages

  • p. 23 …size, angular velocity and acceleration, appearance and disappearance bearing, initial and final elevation, altitude, and orientation…
  • p. 91 …and again tumbling, then changing course and disappearing into the sun. It reappeared and was seen…
  • p. 94 …the speed of a jet before it disappeared. No propulsion was apparent. Time of observation was…
  • p. 265 …Other 13« How did object disappear from view: Suddenly or Gradually Circle One At any time…
  • p. 272 8.1 What direction were you looking when the object disappeared? (Circle One): a. North b…
  • p. 274 …How did the object disappear from view? (Circle One): a,. Suddenly b« Gradually c. Mot very…
  • p. 282 …How did the object or objects disappear from view? : 2 4 . In order that you can…
  • p. 283 …From horizon 31.2 When it disappeared: a.' From true~North b. From horizon _ L degrees…
  • p. 293 CODE 56 DISAPPEARANCE BEARING X - Disappeared suddenly Y 0 - N 1 - NE 2 - E 3 - SE…
  • p. 297 …Angular velocity Angular acceleration Describe appearance Describe disappearance Initial elevation Final elevation Altitudej_1000 ft. Object…
  • p. 300 …Velocity Angular Acceleration UGI'1Gn Appearance bearing Disappearance Bearing Initial Elevation ^ . J.. Final Elevation D^oiipti…
  • p. 303 …69 DISAPPEARANCE BEARING CODE 70-71 ELEVATION WITH RESPECT TO GROUND, DEGREES X Disappeared suddenly Y…
  • p. 307 …a o ^ l o n Appearance bearing Disappearance Bearing I n i t i a l…
  • p. 309 …Sighting Reliability ^— Observer Reliability Maneuvers ^— Final elevation Disappearance Bearing Angular Acceleration Light Brightness >s— Shape ^— Number…
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STUDY NO. IO2-EL-55/2-79
ANALYSIS OF REPORTS OF
UNIDENTIFIED AERIAL OBJECTS
PROJECT NO. 10073
5 MAY 1955
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Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.