Agni-VI: India’s Next Missile all set to Surprise the World ?

[lupgain]

https://pt.scribd.com/mobile/doc/73...icle-BGRV-and-Indian-Missile-Program#download

 

[kurup]

Regarding range, once the missile is outside the earth's atmosphere it can coast forever. In a sense it will in in orbit around earth and therefore have an almost unlimited range.

It can't coast forever .... RV are sub-orbital ..... they don't have sufficient velocity to remain in an orbit ..... hence will be pulled back by earth's gravity .

For example, where the Agni 5 is concerned, the first stage is fired for 90 seconds, getting the missile to 40 kms altitude, the second stage separates at the 155 second stage, getting the A-5 to 110 kms altitude, and the third stage separated after firing for the next approx 135 seconds to reach the missile into space and outside of the earth’s pull, with the built-up momentum taking the A-5 to its ballistic apogee of around 600 kms.

At this altitude, a missile is in orbit around the earth. For example, the CARTOSAT series of satellites have an orbit with a perigee of 200 km and an apogee of 1,200 km above the earth’s surface and will be in orbit for the better part of a decade covering millions of kms.

Cartosat will remain in the orbit bcoz it has sufficient velocity imparted by the rocket ....... but in case of RV the velocity will keep on decaying till it reaches apogee and as a result will not be able to be in an orbit .

Thus the A-5 with an apogee of 600 km can be in orbit almost indefinitely, resulting in an infinite range like other ICBMs. But it needs to be got down to hit the target for which an enormous amount fuel is needed for re-entry into the atmosphere. Here lies the rub! Fuel!

By the way, early Soviet and American manned orbital missions used modified ICBMs as launch vehicles.

Re-entry doesnot require any fuel ..... gravity does that ...... the only fuel requirement if any in space will be for course corrections .

 

[Mikesingh]

It can't coast forever .... RV are sub-orbital ..... they don't have sufficient velocity to remain in an orbit ..... hence will be pulled back by earth's gravity .

Cartosat will remain in the orbit bcoz it has sufficient velocity imparted by the rocket ....... but in case of RV the velocity will keep on decaying till it reaches apogee and as a result will not be able to be in an orbit .

For the Agni-5, the apogee is 600 km but a velocity of 24 Mach which has been kept slightly lower than what is required for keeping it in orbit. Thus it's trajectory and speed brings it back to Earth.

Re-entry does not require any fuel ..... gravity does that ...... the only fuel requirement if any in space will be for course corrections .

The crucial part is re-entry because of high aerodynamic heating due to friction at hypersonic speeds. However more fuel would be required for retrofire, and parabolic corrections from such altitudes to hit a target accurately. Remember, you need to retro from Mach 24 to approx Mach 7 as terminal velocity for accuracy, and atmospheric friction alone is not enough to do that!

 

[kurup]

For the Agni-5, the apogee is 600 km but a velocity of 24 Mach which has been kept slightly lower than what is required for keeping it in orbit. Thus it's trajectory and speed brings it back to Earth.

The crucial part is re-entry because of high aerodynamic heating due to friction at hypersonic speeds. However more fuel would be required for retrofire, and parabolic corrections from such altitudes to hit a target accurately. Remember, you need to retro from Mach 24 to approx Mach 7 as terminal velocity for accuracy, and atmospheric friction alone is not enough to do that!

Mach 24 is the highest velocity A5 RV is said to achieve during flight ...... But this max velocity is not achieved at the post boost phase but it is achieved just before re-entry ...... so velocity being kept low to not attain orbit is afaik is not correct .

If you look at the A5 RV you can see 4 thrusters ..... these thrusters does the course corrections , after the boost phase ends and RV is detached .

So I don't know of any retrofiring mechanism that brings the velocity of RV to lower mach figures other than friction .

 

[Chinmoy]

Wait for K4 and HSTDV, K15 already prove that we are one of the first to go for booster glider warhead.

While others are only doing development flights, ours is in production called B05.

K15 demonstrated boost glide capability? When? Any source for that?
At best of my knowledge, neither we tested MIRV or MaRV.

 

[sayareakd]

K15 demonstrated boost glide capability? When? Any source for that?
At best of my knowledge, neither we tested MIRV or MaRV.

First Agni TD was MaRV........... i posted that from drdo book

 

[sayareakd]

K15 demonstrated boost glide capability? When? Any source for that?
At best of my knowledge, neither we tested MIRV or MaRV.

Check out @sayareakd's Tweet:

If dont follow me at twitter, therefore your knowledge is lacking

Just kidding

 

[Chinmoy]

Check out @sayareakd's Tweet:
View attachment 17858

If dont follow me at twitter, therefore your knowledge is lacking

Just kidding

Thanks for enlightening me. I believe this excerpt is from the book released by DRDO on Kalam Sir? Sorry that I missed out on such an important part.

 

[sayareakd]

Thanks for enlightening me. I believe this excerpt is from the book released by DRDO on Kalam Sir? Sorry that I missed out on such an important part.

No problem, now if we did MaRV 23 years ago, they tested more than 120 prithvis (i lost count), as per book, it appears not going MIRV was political decision, or else A3 and upward are meant to be MIRV.

Now they should not only make MIRV but also multiple kill vehicles for BMD.

I dont think reducing kill vehicle will be much problem for them. They also need to come up with out of box thinking.

 

[sayareakd]

Check out @sayareakd's Tweet:
View attachment 17858

Above tweet posted more than year ago.

Now we got this to prove it.

Credit of image goes to original poster of the group.

 

[vampyrbladez]

Above tweet posted more than year ago.

Now we got this to prove it.


View attachment 27178 View attachment 27179

Credit of image goes to original poster of the group.

Is it MARV booster for Agni V?

 

[Advaidhya Tiwari]

Above tweet posted more than year ago.

Now we got this to prove it.


View attachment 27178 View attachment 27179

Credit of image goes to original poster of the group.

You have given image of the 2nd stage having directional thrusters. But you have not shown that the warhead or the RV is maneuverable. Naturally, 1st stage only pushes up and the 2nd stage has to maneuver in horizontal direction. But that is not the RV maneuvering

 

[sayareakd]

Is it MARV booster for Agni V?

Watch this video


Frame 4.30 onwards.

This is what we did in 1994

 

[sayareakd]

You have given image of the 2nd stage having directional thrusters. But you have not shown that the warhead or the RV is maneuverable. Naturally, 1st stage only pushes up and the 2nd stage has to maneuver in horizontal direction. But that is not the RV maneuvering

Already posted from drdo book...............i could only post, what drdo could post, nothing more than that.

 

[no smoking]

Watch this video


Frame 4.30 onwards.

This is what we did in 1994 View attachment 27183

The video shows how a typical re-entry vehicle works:

1. Using small rocket to adjust the PBV's gesture and angle for targeting (every RV will do that);

2. After releasing the warhead, the spinning gives the RV more accuracy and stability.


The RV in the video is not a MARV at all.

 

[indus]

Yes. Thats what I thought too. Its the Post Bus Vehicle that s manuvering not the RV. IMO RVs cannot manuvere themselves at high reentry speeds, hence only PBV can put them into defined trajectory. Mamuvering PBV enables a MiRV capability.

 

[HariPrasad-1]

10000 km range

Do not get excited about the range. Even if it has the range, it will not be disclosed. What is important is miniaturizing of Nukes and MIRV.

 

[HariPrasad-1]

Further we are developing K series missile which will extend it's range even further when launched with submarine.

K Series are so accurate that you can use them with traditional warhead.

 

[Chinmoy]

You have given image of the 2nd stage having directional thrusters. But you have not shown that the warhead or the RV is maneuverable. Naturally, 1st stage only pushes up and the 2nd stage has to maneuver in horizontal direction. But that is not the RV maneuvering

The pic clearly shows the missile to be Agni 1. Now Agni 1 being a single stage missile doesn't have a second stage RV.
Those are retro rockets strapped up to give directional thrust. First baby steps of developing MaRV with thrust vectoring RV.

 

[Advaidhya Tiwari]

The pic clearly shows the missile to be Agni 1. Now Agni 1 being a single stage missile doesn't have a second stage RV.
Those are retro rockets strapped up to give directional thrust. First baby steps of developing MaRV with thrust vectoring RV.

The rocket initially fires straight up and hence needs thrust vectoring to steer. This is true for every rocket. There is no MaRV involved as this is not Reentry vehicle. This is the basic of rockets