[quote name='ramana' date='18 May 2010 - 10:54 PM' timestamp='1274202978' post='106433']
Saik, The connundrum of the Agni series is that the rentry vehicle is a boost glide vehicle and not plain old ballistic re-entry vehicle. What this means is the RV re-enters at a significant distance from the target and travels to the destination taking evasive moves. So to use a ballistic trajectory program to calculate the RV trajectory causes gaps in understanding the flight.
All I would take away from current data released is the apogee was 230km and re-entry velocity was 3.5km/sec and the total time of flight was 660sec. Someone can figure out what was the time to re-entry ie to fly to 150 km. And the difference is the re-entry boost glide path time.
[/quote]
Here is one configuration that has re-entry velocity of 3.5Km/sec (relative velocity, as against inertial velocity) and apogee of 230 Km. Note that time to re-entry altitude of 120 km is only 485 seconds.
Pure ballistic flight time would be only 561 seconds and range of 1,577 km.
So for 660 seconds it was a non ballistic trajectory and has to be hypersonic glide trajectory.
Connect the dots.
Saik, The connundrum of the Agni series is that the rentry vehicle is a boost glide vehicle and not plain old ballistic re-entry vehicle. What this means is the RV re-enters at a significant distance from the target and travels to the destination taking evasive moves. So to use a ballistic trajectory program to calculate the RV trajectory causes gaps in understanding the flight.
All I would take away from current data released is the apogee was 230km and re-entry velocity was 3.5km/sec and the total time of flight was 660sec. Someone can figure out what was the time to re-entry ie to fly to 150 km. And the difference is the re-entry boost glide path time.
[/quote]
Here is one configuration that has re-entry velocity of 3.5Km/sec (relative velocity, as against inertial velocity) and apogee of 230 Km. Note that time to re-entry altitude of 120 km is only 485 seconds.
Pure ballistic flight time would be only 561 seconds and range of 1,577 km.
So for 660 seconds it was a non ballistic trajectory and has to be hypersonic glide trajectory.
Connect the dots.
Quote: Rocket Ballistic Simulator results
Launch Direction = 60 degrees-North, Launch Latitude = 30.00 degrees
Stage Event Time-Sec Time-HH:MM:SS Range Altitude LOS-Range LOS-Azimuth LOS-Elevation Velocity V-angle rVelocityMag rVeloElevation-angle rVeloAzimuth Accn A-angle Force F-angle Effective-G Lat Long EnergyTotal EnergyKinetic EnegryPotential Drag AirSpeed MachOne MachNumber Cd
Stage1 BURNOUT 49.50 0:0:49 24,841.109 19,977.437 31,721.367 60.204 38.228 1,737.255 32.442 1,446.237 40.263 60.227 11.5114 -80.466 9,207.932 -80.466 11.0163 30.111 77.429 1.7041455 E+6 1.5090281 E+6 1.9511740 E+5 2,000.14 1,446.2 295.1 4.901 0.253
Stage2 BURNOUT 89.50 0:1:29 102,964.176 66,995.877 123,132.423 60.614 32.333 3,795.933 24.437 3,452.250 26.911 60.666 84.4702 20.462 23,686.141 20.462 -31.3719 30.457 78.302 7.8541220 E+6 7.2045541 E+6 6.4956790 E+5 19.51 3,452.3 305.3 11.308 0.252
PostBoostVehicil BURNOUT 289.75 0:4:50 714,710.545 234,459.570 764,126.632 63.969 14.606 3,580.374 1.979 3,212.643 2.238 64.422 9.1147 -89.978 1,877.820 -89.978 7.1785 32.995 84.869 8.6252062 E+6 6.4095380 E+6 2.2156682 E+6 0.22 3,425.2 269.5 12.712 0.252
PAYLOAD ON-PEAK 306.75 0:5:7 768,107.207 235,505.059 816,323.260 64.286 13.265 3,577.672 -0.003 3,209.434 0.029 64.787 9.1122 -89.992 1,859.627 -89.992 7.1769 33.201 85.458 8.6250672 E+6 6.3998699 E+6 2.2251973 E+6 0.22 3,425.2 269.5 12.712 0.252
PAYLOAD ON-REENTRY [color="#800080"]485.75[/color] 0:8:6 1,329,293.105 [color="#800080"]119,710.697[/color] 1,344,626.710 67.849 -0.903 3,865.819 -19.618 [color="#0000ff"]3,525.105[/color] -21.572 68.918 9.4389 -89.992 1,926.301 -89.992 7.3984 35.186 91.808 8.6235338 E+6 7.4722778 E+6 1.1512561 E+6 0.22 3,425.2 269.5 12.712 0.252
PAYLOAD ON-TARGET 561.50 0:9:22 1,577,761.838 -131.279 1,573,763.325 69.552 -7.102 4,153.087 -26.712 3,836.502 -29.085 70.888 9.7964 -89.992 1,999.275 -89.992 7.6389 35.953 94.701 8.6227816 E+6 8.6194946 E+6 3.2869299 E+3 0.00 3,836.5 339.0 11.317 0.252