 |
|||
|
|
|||
| ||||||||||
|
|  MIL-S-18471G(AS)
APPENDIX
P
= catapult pressure, psig
= effective catapult cross-sectional area, square
A
inch
= weight of the ejected mass, pounds
W
V CAT = area under the aCAT curve, feet per second
t 2' = selected end point for the integration process,
seconds
= time at catapult separation, seconds
t
2
t o = time at ejection seat first moton, seconds
t 1 = time at start of the first escape path clearing
pulse, seconds
Z axis seat acceleration test data, aSEAT shall be used
(2)
to obtain seat velocity VSEAT feet per second,
from the equation
Initially selecting t2' = t2 the ratio VSEAT/VCAT shall
(3)
be calculated.
The catapult pressure baseline is equal to (aCAT)
(4)
[ ( VSEAT) / VCAT1
The catapult pressure baseline shall be compared to
(5)
aSEAT to define the escape path clearance retarding
pulse (peak amplitude and pulse duration} as defined in
figure 7.
Within limits imposed by the calculation procedure, the
(6)
catapult pressure baseline shall coincide with the aSEAT
trace over the interval to to tl. If the baseline and
aSEAT curves do not coincide over the interval to to tl,
t2 shall be reduced in increments and steps (3) and (4)
above repeated until agreement of the two curves in the
interval tO to t1 is achieved. Individual baseline
overlays of aSEAT shall be reviewed by the procuring
activity to provide a basis for approval of the t2' value
which provides the best fit.
85
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals