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.”

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•Incident ObaerTer' s
•oo Ocoupad.on Ka.neunra Weather
Capt, United Airlines Straight-away horizontal flight lot stated
ll
12
lS
14
16
17
18
19
21
22
23
24
26
27
28
29
30a
Coast Guard
Deputy Sheriff
!lot stated
Sot ste.ted
Jot stated
Mot stated
Private pilot
llot stated
Farmer
lot stated
lot stated
Wot stated
!lot stated
lot stated
Not stated
llecba.nic
TWA Representative
Lt Governor
ffest Coe.st Pi lot.
7000 hrs.
Ca.pt. USAF. Asst
Operations Officer
VHF/DJ' Operator
Horizontal flight
Mot stated
Not stated
FUppi ng around
Not stated
Hot stated
Straight horizontal flight
Horizontal fli ght
Straight course - were flying
about a city block apart. one
behind the other
Straight course
Single file
Flashing
Horizontal flight
Shooting up and down
Hori&ontal flight
lot atated
llot stated
lot stated
Bot stated
Climbing and descending ver-
tioally
Hovering, made three 3600
turns around one place. Moved
to another position and circled
more. Turns required 30-40 seo.
Diaaeter estimated at 2 miles.
Kot stated
Not stated
Bot stated
Mot stated
Iot stated
Mot stated
Clear as crystal
Clear
Cloudless and
sunny
lot stated
Rot stated
Bot stated
•ot stated
Clear
Bright moonlight
Not stated
Clear
Kot stated
lot stated
Solid overcast
Overcast. 1000 ft.

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.