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.”

Incident
loo
SOb
30o
32
33a
33c
33d
3:Sf
:S3g
34
35
36
37
38
39
40
- cor~FIDENTIAL
Observer's
Occupation Maneuvers
Traffic Air Controller Bobbing up and down
lot a~ated Climbing and de~oending
Profe11or and Bead Mone
or Aero Kn.gineering
Lt, USAP Bone
T/Sgt, USAF Jone
1,it.,Lt, USAF Bone
PFC lone
Capt, USA1 Kay have been turning
Capt, Us.Ar None
Col, Ky. State Police Kone
Capt, USAF (Plight Not stated
Leader •a 869)
Unknown Mot stated
Judge Bone
Second Officer.Wavy Mone
CAA Official Sot stated
Pilot Kone
Hungarian Peasants Not stated
Constable
Not stated Spiraled downward f'rom 5, 000
to 2,000 f't am then went
upward at a 450 angle
Weather
Overcast
High overcast
Clear
Overcast
High acattered olouds
Visibility unlimited.
High scattered
lfot stated
High overcast
with BIS
High ecattered,
vi ei bi lity unlimited
Clear
.Not stated
Not stated
Clear
!lot atated
Rot stated
Clear ..,-.'!
!lot stated
a.tVU. ~ d
Cumulus clouds

Cases discussed

About this file

Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 45 pages are in the text index: search them above, or from the library's search.