06-24-2013, 12:03 PM
[quote name='Arun_S' date='23 June 2013 - 12:03 PM' timestamp='1371968715' post='116688']
Atmospheric pressure changes quite sharply during re-entry into denser part of altitude. Almost always RV's don't reach terminal velocity. Simulations give proper answers.
A1 for maximum range enters at near 45 degree inclination. Thus not knowing the cross angle of camera shot can be overcome by only requiring change in vertical altitude.
Some information to consider for A1 with 1,000 Kg warhead at full range:
Now that can give an idea of the payload yield because there is an optimum air-burst altitude for a given payload.
[/quote]
I just have some questions on this:
1) Is 45 degree angle at full range the launch trajectory providing maximum range?
2) Your reasoning on the half air-bust altitude and Cd change are clearly observable and the projectile does slow down considerably from thereon in. Do you include a correction for this in your final figure?
The following are just questions on the right weapon for pakistan and right weapons in general:
3) Won't a 2.5 km high bust also be a problem with prevailing winds and subsequent fall out being blown our way? (To partially answer this question, unkil tested plenty right next to Los Angeles or was it Las Vegas and people still live there ... so maybe its not such a big concern ...)
4) If the 2.5 km figures are right did they overcompensate in the corrections made because of the fizzle warhead?
Atmospheric pressure changes quite sharply during re-entry into denser part of altitude. Almost always RV's don't reach terminal velocity. Simulations give proper answers.
A1 for maximum range enters at near 45 degree inclination. Thus not knowing the cross angle of camera shot can be overcome by only requiring change in vertical altitude.
Some information to consider for A1 with 1,000 Kg warhead at full range:
- Air speed : 1,750 m/sec (at 3 Km altitude)
- Angle: 45 deg (thus vertical component of velocity is 1.24km/sec)
- Time from air burst altitude to half the air-burst altitude: ~ 1 second. (during this time the velocity did not noticeably change; to be expected due to disfigured payload and change of Cd there of.
- The camera distance was >> air bust altitude, so the sine ~ tan
- Thus the air-burst was at about 2.5 Km altitude (The error depends on time measurement. If one gets finer time stamp measurement teh estimate will be more accurate )
Now that can give an idea of the payload yield because there is an optimum air-burst altitude for a given payload.
[/quote]
I just have some questions on this:
1) Is 45 degree angle at full range the launch trajectory providing maximum range?
2) Your reasoning on the half air-bust altitude and Cd change are clearly observable and the projectile does slow down considerably from thereon in. Do you include a correction for this in your final figure?
The following are just questions on the right weapon for pakistan and right weapons in general:
3) Won't a 2.5 km high bust also be a problem with prevailing winds and subsequent fall out being blown our way? (To partially answer this question, unkil tested plenty right next to Los Angeles or was it Las Vegas and people still live there ... so maybe its not such a big concern ...)
4) If the 2.5 km figures are right did they overcompensate in the corrections made because of the fizzle warhead?