PROJECT BLUE BOOK

PROJECT 10073 RECORD
1. DATE: TAME GROUP 2. LOCATION *.
20 Aug 49 20/25502 Denver, Colurado
SOURCE 10. CONCLUSION
Civilian ' AIRCRAFT
'
4 HUMDER OF OSJECTS
Che .
S. LEHOTH OF OSSERVATION 11. BRIEF SUMMARY AND ANALYSIS
20 seconds Object was reported heading 260 deg, altitude 40,000 ft,
speed 17,999 mph. Was shaped like a flying wing with heat waves
6. TYPE OF ODSERVATION emanating from the trailing edge. Object was estimated to be
Ground-Visual labout the size of a B029 and was the color of aluminum. Object
flew in a straight unusual maneuves.
7. COURSE
West
. PHOTOS
F
Yos
E No
9. PHYSICAL EVIDENCE ..
. -
.

I8

(1) Surface observations (teletype sequences) indicate
scattered cumulus type clouds at 7oo0 to 802o feet
and an occasional thunderstorms were prevalent in the
Denver area. Visibility vas excellent with no obstruc-
tions. attached).
(2) of radio set SCR 658
tracking transmitter attached to a balloon was conducted
from l4l5 to l442 when run was terminated due to fad-
ing s signal. Set wes operated megacycles with
some interference. Cause of interference was undeter-
mined. Copy upper ind report (RAnIN) attached.

Station Weather Officer
11

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This copy will safeguarded with the greatest care until action is completed. at which time it will
MCAG Form No. 22 be prepared for destruction in accordance with Section IV. Hq. Office Instruction No. 11-2.
E (Rev 25 Oct 48) G
WF-1-16 FEB 49 10M
MESSAGE MESSAGE
-

)
for L. J. SEIBERT
Major, USAF
District Commander
Inc (dup)

: 34
.
III UNCLASSIFTED
yn.
AU
1.51
WF-L-1S FEB 49 4 Mil 260M (CONTINUE
AMC Ferm Ne. 5 29 Jul 47) This form replaces AMC Form No. 10-3, which will
be used until stocks on hand are exhausted.

report conventional Aircraft. Re-
compliar Air Intelligence Re-
quirements Memorandum Subject: Uncon-
ventional Aircraft.
E. T. MURTHA
Captain, USAF
Wing Intelligence
Info Copy:
Chief, Intelligence Section
AC/S, Operations
Hq. Tech Division
Air Training Command 1
649-40

hupp
SCHLUPP
Capt, USAF ALS
Commanaing
DOWNGRADED AT DQD DIR
mis;
.

well acquainted conventional types aircraft, eatimated the diameter of
this object to roximately the same B-26, or 85 foet When sighted, the
angle of elevation was approximately 85 degrees, The color and construction of the
material was similar to aluminum. Mr stated theobject probably jot pro-
pelled.
2. Weather at l630 MT was scattered cumulus type clouds bases variable 8000 to
10,000 feet, visibility 30 miles more winds aloft 15,000 feet 300 degrees 18
knots becoming 33 There was no outstanding or prominent celestial
phenomena. consisting of radio set SCR-658 tracking tranamit-
ter attached A balld ducted from 1415 to 1442. WAS terminated
due to fading signal erated acyoles one interference.
Cause of interference undeterminsd. Radar observatior AP0/13 made at
1500 and 1700. Nothing unusua s reported.
3. U. S. Weathe Bureau weather station at Stapleton Field, Denver, Colorado,
made upper air vati on consisting of tracking of a weather baloon through optical
means from 1400 Wa- terminated when balloon burst.

being oval shape. Object w about the size of a D-26
and was the color of aluminur bject's elevation was approxi-
mately or aperoximately wenty (20) seconds.
No witnesses t
No investige concerning
this matter.
DOWNGRADED AT 3 YEAR
DOD DIR 5200.10
eibet
- EIUEY
ajor, USAF
District Commander.
AFHQ FORM 10-57744-1 U. B. GOVERNMENT PRINTING ORPICE
15 JAN 49 0-208 Replaces AFUNCLASE

Denver, Colorado LAFB 000.9-3 PAGE 1 OF 4 PAGES
PART II - REQUIREMENTS
General
l. Date of sighting: Saturday,
2. Time of sighting: 2330z
3. Where sighted (observer artmouth
a. Ground
(1 city, town: I Denver, Colorado
(2) Distance and direction from city or towm, road, intersection, etc.:
Heading West, 260 degrees.
(3) From building (story), yard, etc.: Yard.
(4) Map coordinates (if feasible) showing longitude:
Not determined.
b. Air: Not applicable.
o. Sea: Not applicable.
4. Number of objects: One. Appeared oval because of fumes.
5. Observable celestial phenomena or planets that may acco unt the sighting
Bright sunny day..
6. Distance of object fram observer.
a. Laterally - approximately l0 miles.
b. Angle of elevation from horizon: degrees.
o. Altitude: 40,000 feet.
(2) Size Size of B-26.
WOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT. 5O U. S. C.—
31 AND 3. AS AMENDED ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED BY LAW.
IT MAY NOT BE REPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES. EXCEPT BY PERMISSION OF THE DIRECTOR OF
INTELLIGENCE, USAF.
CLA
;

b. Length and width: heat vapor
c. Odor (if any): None.
applicable.
12. Effect on clouds: lear.
13. Lights: None.
14. Support: Wings Object appea pt back flying wing. The trailing
edge of the wing emitted a fuzzy he oval shaped ap-
pearance.
15. 1 Propulsion: Probably jet propelled.
16. Control and stability: Not observed.
17. Air duote: Not observed.
18. Speed -M.P.H.: 1700.
19. Sound: Distance too grea t for soune heard.

7. Reliability observer rop
reliable.
8. Notes relative ob
a. Sightings in general: Not applicable.
Degree of and where
.. observer is
9. Witnesses: None.
10. Comments of interrogator regarding the intelligence and racter of pe rson inter-
rogated: Witness was the quiet, sober type appeared sincere. This
Intelligence Officer, after onsidering the witness' background and experience and
apparent sincerit is a possibil truth in his statenents.
Relative to Radar Sightings
Radar equipment of the Denver Bomb Plot
1/I

lasted approximately 20 nothing
b. Activities of U. yer,
Colorado:
(1) Surface observations (teletype sequences) indicate scattered cumulus
olouds in the general area isibility unlimited. Copy of reports
attached.
(2) of a weather balloon through
optical means (theodolite) from 1400 to 1433. Run was terminated when
baloon burst. (A white balloon was used.) Copy of report (PIBAL) attached.
d. Aotivitiesof Naval Weathe on at Buckley Field, Colorado:
(1) Surface observations umulus cloud with
excellent visibility.
Analysis Soattered cumulus type clouds bases variable
8000 to loooo feet, visibility 30 miles or more, winds aloft 15000 feet 300 degrees 18
knots beconing 330 degrees 33 kmots.
11

3415th Technical Training Wing
and
Lowry Air Forc Base
Denver, Colorado NY/vph
25 August 1 1949
SUBJECT: Report Aircraft
TO: Commanding General
Lowry Air Force Base
Denver, Colorado
ATTN: Wing cer
1. The following report of aircraft other than those based at Lowry
Air Force Base which were flying in the vicinity of Denver between the
hours of 1500 MST and d1730 MST r (exact time e not determined20 August 1949
was obtained from Ted Holmes, CAA Controller Stapleton Airport:
United 1617 Continental 66 Cessna 79V Western 81
105 26 3727V
101 43 22A
629 23 53293
618 266 914
607 226 71V
27V
21V
DOWANCLA WA Beach 33A Air Force 208 Navion 92K Slick 933
365 07K
111

.
.

scattered cumulus type clouds at 7000 to 8000 feet
and an occasional thumderstorms were prevalent in the
Denver area. Visibility was excellent with no obstuc-
tions. (copy of weather attached).
(2) Upper Air Observation consisting of radio set SCR-658
tracking transmitter attached to a balloon was conducted
from 1415 to 1442 when run was terminiated due to fad-
ing signal. Set was operated 3 megacycles with
some interference. Cause of interference was undeter-
mined. wind report RAwIN) attached.
(3) Radar observ .

-
LYNN H. PRIBBLE
Major, USAF
Station Weather Officer
.

PB_32
83016 03214 53439 03247 53050
.
- 1949
1530M BUY 80015+
1630M BUY 80015+ 140/82/4+1<6/016
1730M BUY 30015+ 110/82/41-10/016

3. here sighted server's posit
Denver, Colo.
a. Ground
City, towm: Denver, Colorado
(2) Distance and direction inter-
section, etc. Heading est, 260 degrees
From building (story), yard, etc.: Yard.
() Map coordinates (if feasible) showing latitude and
longitude: No t determined.
Air: Not applicable.
c. Sea:
4. Number of objects: One. fume s.
5. Observable celestial phenomena or planets may account
for the sighting: Bright sunny day.
6. Distance ject from
a. Laterally - 10 miles.
b. Angle of elew ration from horizon: 85 degrees
feet
10. Tactics
.
UNCLASSIFIED

15. Propulsions Probably jet propelled.
16. Control and stability: Not observed.
17. observed.
18. Speed od.i 1700
19. Sound: Distance too great sound to be heard.
20. Manner of disappearance: d frcm view
Relative to the Observer
1. Name of observer:
2. Address: Street, Denver, Cclorado
3. Occupation:
Training, Lowry Denver, Colorado
4. Place of business:
a. Name of employer: I Lowry Air Force Base
5. Pertinent hobbies: Archaeology - chess.
a. Is observer amateur astronomer. etc. 54
months USAF former Armament Officer,
8. on
a. Sightings general: Not applicable.
UNCLA b. How attention was object: Motion
SSIFTED
3 i.

2. Winds aloft report:
a. Activities 19-3L, 19tl Squadron attac Lowry
AFB, is as followst
(1) Surface observations (teletyre sequences) indicate scattered
cumulus type clouds at 700o to 80o feet and an cscasional
thunderstorm were prevalent in the Denver area. Visibility
was excellent with no obstructions. (Copy of weather
reort attached).
(2) Upper Air servation consisting of SCR-658
tracking transmitter attached t to a balloon was conducted
from 1415 to 1442 when run was terminated due to fading
signol .o
40

ive."
x
3. in the report have been made
and are being attached this report as inclosures.
PA
CLOSED
INCLOSURES
FOR CG, AMC, WRIGHT-PATTERSON AFB, DAYTON, OHIO
1. Two cys 1tr, 191Oth AACS Sq, Lowry AF Base. 25 Aug 49 .
2. Two 2 cys 1tr, 3415th Tech Tng Vig, Lowry AF Base, 25 5 Aug 49
3. Two (2) cys ltr, Det A 39030 Radar Bomb Base,
25 Aug 49
4. Two (2) cvs Lomx Sug.49

.
20, 1949 also resulted report.
/t/ TAYLOR S. SHREVE
Major, USAF
Commanding
-f
thee

TO: Commanding General
Lowry Air Force Base
Denver, Colorado
ATTN: Wing
1. other than those based at Lowry
Air Force Base which were flying in the vicinity of Denver between the
hours of 1500 MST and 1"30 MST (exact not determined20 August 1943
was obtained from Mr. Ted Holmes, CAA Controller at Stapleton Airport:
United 617 Continental 66 Cessna 79V Western 81
105 26 3727V
101 43 22A
629 23 53293
618 266 914
607 226 71V
27V
21V
Beach 33A Air Force 208 Navion 92K Slick 933
365 O7K
Stinson 917C Lockheed 501 Piper 079
2. The following a report of pilots flying scheduled flights in
the vicinity of between the hours of 1500 LiST and 1730 MST