aSee
much as 20 percent higher.
This correction weuld place the data
'’ The tiigh overpregsures recorded from the land stations on Shot
2 are ingood agreement with the 1.6 KT curve while the two reef
stations again show lower pressure values than would be indicated
by the curve. A correction as mentioned in the previous paragraph
ry Would bring these values more in line with the pressure values from
|] other shots at similar scaled distances.
IN
The peak overpressures recorded on Shot 3 fall on both sides
IN of the 1.6 KT curve, but this was expected because a yield value
150 KT was used in scaling both blast lines. If the values from
fps
Polast line on Uncle were scaled from a 150 KT yield and those
ifr n Tare Complex scaled from a 110 KT yield the pressure values
(wohdd fall much closer to the 1.6 KT free air curve.
Bret Shots 4, 5 and 6 are all in good agreement with the 1. 6 KT
curve.! Meastrenents from these shots were from land stations
and the ;walues recorded are felt to be reliable with but one
exceptian, - Station 124,18 on Shot 6.
me)
3
DYNAMIC PRESSURE
ih
satnoual Ae measurement of dynamic pressures was a secondary
objective and’=r ---~-- used were in the developmental stage, excellent
results were “*
‘*::. The major effort in these measurements was
made on Shots 5 BIGOa, On these shots extensive instrumentation was
used, not only forrgage evaluation, but also to obtain data for
Project 1.8.
All meBstrrements of dynamic pressure were corrected for
compressibility and supenspnic flow where applicable.
The measured dyn
for all shots instrumen
the corrected dynamic p
sea level) are plotted.
ressure values and the corrected values
re listed in Table 3.7.
In Figure 4.5
e versus distance (reduced to 1 KT at
The atmospheric pressure was so near standard
that the scaling factor amounted
to less than 0.5 percent and was not
applied.
The solid line in Fire 4.5 is a theoretical dynamic
pressure curve computed from overpressure values obtained from a 1.6
KT free-air curve using the followingequation:
i.
a =
Where;
q
2.
Panera
genoa
thee woo!
one
.
Lotee,
from the two reef stations more nearly on the 1.6 KT curve.
25 (PDa
Pit
Py) f
=
dynamic
P_
=
atmospheric me
P.
=
static overpreldiiiie
°
sgure
rs
Although the surface pressure measurements show only alot
deviation
from a scaled 1.6 KT pressure versus distance curve, tieAyaled
dynamic pressure values plot higher than would be pred
from a
1.6 KT curve of side-on pressure versus distance.
53