.
‘woe
oS
os
on
curing the shot.
rtanal
sere
TABLE 4.2
-
Pressure Attenuation for ¢ = 0.9 gn/w?
2
pr (awy/3 Ry
38.0
3000
0.06
9.969137.2]
662
162898 Ry> R Valia
;
20.5
4000
9.16
|o.922]29.4]
648
[67k2} RoR valta
16.0
4500
0.25
0.862]14.6]
637
16605
o
12.7
5000 ,
0.36
0.800{11.0|
620
[6410 R\>R Valia
f fu
10.5
5500
0.52
|0,705{8.4
595
[6132] R, >R valta
9.2
5820
0.63
0.65 |7.0
560
[5900] Ry=> Valid
8.9
6000
0.72
0.589}6.%
560
[5720] Ry< R Not Valid
\ WD
ee
:
ty
Mie “Sate Rs
,
‘
i
Site Se
R)>R Valid
+
It may be assumed that beyond 5800 feet ‘there will be some
turth r evaporation but not complete evaporation and that the shock
front” will-move out in the usual manner or as though it were generated
from a charge of (ZW) energy where Z equals approximately 0.65.
If it
is assum¢d) that there is no furtheg 38s in energy due to evaporating
moisture’ phan the equation Pr = PZ
should hold for distances be-
Pr = PO.762,
“ts
yond 5800 feet,4f.Z is held constant.
{ (1
Therefore, Pr = PO.65°°
yr
t
patna sem
P(pst)|R(rt) [p77] i
wa.5 - Comparison of Measured and Calculated Pressure Attenuation
Dist(ae )
*))
*
*
*
*
sec0
joo
8000
9000
* 10000
Clear Line
Rain Line
P
Pr
Calculated
Pr
36.0
37.0
37.2
12.7
9.2
8.9
6.5
5.15
4,2
10.5
7.2
6.9
5.15
4,00
3.20
11.0
7.0
6.8
4.95
3.92
3,20
20.5
17.5
3.53
2.64
19.4
2.69
* Z ie held constant vegout820 feet
The above values are plotted in
4.1.3
Figure,4.4.
Instrumentation
In general, the gages operated
appeared after Shot 1.
preshot prediction.
sdtisfeetoprily.
Some difficulties
The actual yield of te shot far exceeded the
Consequently, most gagdswere subjected to pres-
P
sures considerably in excess of the rated noonPP
ressures.
Excessive
~
overstressing and permanent sets obtained in
ssure capsules
e
caused most readings to be in error by t 15 per ceony t
cots
of the Shot 1 records made it apparent that +t. ~-
to acceleration effects as indicated by ac.
and oscillations.
ae
=ee
count
A table of values are listed below assuming a
= 0.9 g/m .
onneonates
=,
:
Aa examination
ere susceptible
-‘amount of hash
Figure 3.9 is a photograph‘of alLivéicat record
49
eat