Documents / Case file
Project Sign Progress Report, 1948
U.S. Department of War · 1948 · 45 pages · text from the file's own layer
This is an initial Project Sign progress report dated April 1948, sent from Headquarters, Air Materiel Command at Wright-Patterson Air Force Base to the Chief of Staff, U.S. Air Force. It tabulates about 100 unidentified flying object reports received through February 1948, covering shape, size, number of objects, speed and exhaust trails. Dr. Irving Langmuir found the data insufficient for a positive identification. Headquarters judged that a low aspect ratio aircraft using boundary layer control could reproduce many of the reported characteristics.
From the source:Release of 2026-07-10 Incident: 1948, Various. This file contains an initial report from the Air Materiel Command regarding Project Sign. Project Sign was a 1948-1949 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFO). The report details 100 UFO sightings from 1947-1948. The file also contains an article excerpted from “The Aeroplane,” an aviation-focused periodical magazine published between 1911 and 1968, titled “The Biology of the Flying Saucer.”
“Sea”5 pages
- p. 2 …Ining
Langmuir of the P~sea.rch Laboratories. General Electric Comp&ny.
Schenectady, N. Y. to…
- p. 4 …l4 mi1es north of Dauphin,
J.lanitoba, Canada
ticonderoga at sea (40 miles
south of Cape…
- p. 5 …Air
16 Jan IJ7 22:50 Jorth Sea (50 ail•• troa54 tbe Dutch coa,t)
l…
- p. 6 …0015Z Abou-c! the BUl'aeo (at sea
one hr. troa 874ne7, Autft11a) 1 Boat
58…
- p. 25 …Not stated
5~ Bot 1tatecS Borth Sea to
lortolk
22000 Equal to Not stated
or greater…
•
" NND 927545
Cases discussed
- The Kenneth Arnold Sighting 1947
Incident 17, 24 Jun 47, Mt. Rainier, Washington, 9 objects seen from air - The Maury Island Incident 1947
Incident 43, 29 Jun 47, 175-250 ft diameter, inverted saucer, harbor pilot - United Air Lines Flight 105 Sighting, Emmett, Idaho 1947
Incident 10, Capt, United Airlines, horizontal flight at airline speed - Twin Falls saucer hoax 1947
Incident 64, 19 Aug 47, Twin Falls, Idaho - Snake River Canyon Disc: The A.C. Urie Sighting 1947
Incident 75, Snake River Canyon, Idaho, trout farm operator - Muroc Army Air Field disc sightings 1947
Incidents 1 to 1e, 8 Jul 47, Muroc Air Field, Area 113, Rogers Dry Lake - The 1947 Flying Disc Craze: America's First Flying Saucer Wave 1947
Tabulation of many June to August 1947 flying disc reports across the US - The Mantell UFO Incident 1948
Incident 33, 7 Jan 48, Godman Field, Ky., Capt USAF Flight Leader
About this file
Case file, from the pursue collection. The PDF is mirrored here; the original link is under it. 45 pages are in the text index: search them above, or from the library's search.