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Project Blue Book Special Report (second copy)

Internet Archive · 309 pages · text from the file's own layer

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.

  • p. 94 …approach the speed of a jet before it disappeared. No propulsion was apparent. Time of observation…
Enliatm
0- Balloon
l-Asfcamical
2-Aircnfl
3-Lifjht Phenoa

S
1
f
Doubtfu
J.
/f
3
O
0
0
0
0
0
1
7-2.
ToUl
5"
j /
1
0
0
o
r
70
Per Cent
Certain
±1
1A
0.0
at
0.0
li.t
1.1
111
7.1
08.6
Doubtful
2.1
Mf
t ?
0.0
O.O
to
I.H
1I.H
Total
12
H i
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at
06
At
/ / • *
ni
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IOC-
Nunbcr _ j
:«tam
£
II
r
0
0
3
0
6
7
If
Doubtful
- £)
/2
J-
O
P
O
O
0
0
/•?
Total
i
/e
O
O
3
O
/
7
5-5-
Percent
Cerbin
/Of
20.0
91
0.0
O.C
r.s
lOf
12 1
tf.i
Doubtful
0.0
V-8
11
M
0-0
Q.O
0-C
Q.O
0.D
04
30.?
Total
10.1
11-9
O.o
O.C
ss
IP-i
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tin
ltd.
Number
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1
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0
3
0
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0
73
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X.
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7
0
/
a
O
0
6
j-f
Total
IP
7-2.
'S
0
3
/
/0
0
13
?
Per Cent
CerUin
u
ft'5
u
U
ao
170
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f f
/ 2
H I
Doubtful
11
/zo
0.0
(-1
0.0
o.p
0.0>
t.c
S}.J
Total
12.0
US
If-D
0>.D
JC
12
12.0
p.o
ff-7
/a?
mi.
Number
Certain
7
/f
AO
I
3
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%
31
X
m
Doubtful
J.
7
,0
I
0
0
0
0
/3
ToUl
1
JX
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V
0
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2-
1X7
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Is.o
li.l
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74
£1.0
US
IC
30.7
I 6
9fS
Doubttal
1 i
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ss
0-0
as04
0.0
0.0
00
0.0
It. 2
Total
11
17-V
•312
9-2
3-2
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/(.S
30.1
/•&,
IK.
Evaluation
O-Balloon
l-Astnnoraical
2-Airctjft
3-Lifhl Pnenoa.
4-Birds
5-Clouds, Dust, etc
frliauflic Into.
7-Psychotofial
S-Unknoan
9-Otfief
T o t -
A/A /
Number
Certain
'7
1Z.
3
0
It
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/PI
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£
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2.
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6
17
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?-?
Total
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2%
30
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2.
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Percent
Certain
/12
/•J.I
n.2
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CO
I.C
S.0
"+.0
H-1
183
Doubttu
^•'3
1-7
Iffl
IC
_l_c_
•t.o
0,0
0-0
0.0
IC
in
Total
15.5
71.9
23-3
7 7
1-6
/ ? • •
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4 3
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Number
CerUin
JS
1
0
0
J.X.
/
7
/u-7
Doubtful
J-
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O
$
0
P
/
3&
Total
33
31
40
2.
0
0
6
33
S
/T3
PerCent
Certain
15.3
M
/f-3
o.r
fa
0.0
11.6
3.3
i8.0\
18
go.3
Doubtful
7-7
13
CC
OS
00
0.0
0.0
0.0
OS
ft-7
Total
/t.o
21.3
111
l.o
0.0
0-0
IJ.O
3.3
18.0
110:
Number
;ertain
7*
fv
13
3
I
g
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7-U
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3?
72
3
1
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1
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l/f
f£
/£6
17
( •
2
7*
a
63%
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ILL
11
lt-1
1-0
0.5
0-2
114
A3
no
3.?
73.7
Doubtful
Cf
CO
li-1
04
0.5
0/2
0.0
A3
0.0
0.1
2&3
Total
If.O
'S.I
7C.0
24
l.o
Ot
II. C
?•£
no
t.o
100,
Number
Certain
3?
A?
iff
6
• 19
0
UP
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6
/
O
1
P
s-
122.
Total
7S
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O
f
//
79
/£
H-07
Per Cent
CerUin
•7.1
104
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1-5
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0.0
1.2
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11-f
7.7
C1.6.
Doubtful
U
/ / • /
9.1
IS
p.o
o-2
0.0
0-7
1.7
32.9\
Total
i l l
10.1
3J
0.0
0-7
1-3
7-7
3.9
/St.
Evaluation
0-BaHoon
1-Astronomical
2-AircraH
3-lijtit Phenom.
4-Birds
S-Clouds, Dust, etc
6-lnujfiic. hfo.
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S-UnknoMi '
9-Othee
Total
Number
Certain
b
/ % •
, )
/
/
0
I t
3
f
/I /
Doubtfu
/Z
7
27
z
2.
/
0
r
rs
Total
ff
qP
.3
3
ff
3
10
166
Per Cent
Certain
34
'6.?
12
t.b
I t ,
0.0
JLJL
19
Q5.3
4.1
Doubtfu
11
5 .if
U.3
11
1-7
04
CD
0.0
0.0
12
33-1
ToUl
10.8
U l
Ml
1.8
1-8
O.C
H*
19
25.3
CO
100.
Number
Certain
0
1
I)
/o1
30
7$
Doubtful
/Z
IK
2
1
fi
0
0
I
47
Total
20
33
20
7
/j.
/
/O
1
yo
3
Pet Cent
Certain
Cf
n.9
7-2
0.8
•14
0.0
M
no
u
Doubtful
14
/ if ^
8.2
I.C
u
o.p
0.0
0.0
0.?
nt
Total
ICO
2&M
ICO
2f
3.2
O.g
8.0
o.S
2V.0
2-1
ion.
Number
Certain
r
2-/
3
D
6
7
1
j_l
if.
73
Doubtful
1
f1
O
2.
0
0
0
0
33
ToUl
7V-
16
17
0
2,
7
?-i
/O6
Percent
Certain
±1
III
It-H
2-Z
0.0
0.6
• C.C.
Q-1
/f.9
-5.2
C9.1
Doubtful
F.S
/i 1
S.I
0-1
0.0
I f
0.0
40
O.P
•3//
Total
n-7
3
ft. I
3.1
to
1.1
O.f
/
0
Q_
32-
ToUl
/ /
?^
/
O
Cf
Z
fof
PerCent
Certain
5.1
J1L
Q-l
1.0
0.0
0.0
g.C
-LL
11.0
14
67.5
Doubtful
10-S
Q.O
0.0
0.0
0.0
0.0
Ac
30.5
Total
/O.S
-57.3
m1.0
(7.0
O.O
8.C
11
1/..0
7.C
/SO.
123
.

Cases discussed

About this file

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.