Indian Hypersonic Propulsion Developments

[BMD]

1000+ km range with 1.8 tonnes weight is great.
Brahmos can only able to do 800km with 2.5 tonnes.

But i have a doubt, why it switches to ramjet in last stage ?

For lower altitude flight if it's attacking ships. Mach 3-4 at sea level is probably harder to intercept than Mach 6-8 coming in from high altitude.

Is the korean thermal barrier coating and high heat sustaining materials not good enough for cruising at hypersonic speed at low altitude ?

I'm unaware of any thermal barrier coating that is, or any current weapon or proposed weapon that sustains a hypersonic cruise at sea level. Zircon cruises at 28km from what I've read, not sure it even has a low altitude mode.

And why two stage rocket motor ?

Presumably allows it to be smaller overall. Shedding stages is more efficient for any launch. The first stage appears to be the short section behind the rear fins.

I doubt that it even use scramjet, most probably the second rocket motor is for sustained hypersonic speed while 3rd stage which is ramjet is for supersonic speed.

Well reports seem to disagree with this.

but then how its able to travel 1000+ km with just 1.8 tonnes as specific impulse of rocket motor is very low.

Because it uses a two stage rocket motor for launch instead of a single stage one.

And it looks like currently only Russia and China possesses "true hypersonic cruise missile".

Well the Zircon cruises at only M5.5, this one cruises at M6.2 and this one talks of M6 cruise at 23km altitude.

South Korea Reveals an Air-Launched Hypersonic Ship-Killer | MiGFlug.com Blog

South Korea's Hyundai Rotem has revealed an air-launched hypersonic anti-ship missile concept. What the new ship-killer means for the region's balance.

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Very little is known of any Chinese hypersonic cruise missile tests, so difficult to say.

 

[Photon Vish]

For lower altitude flight if it's attacking ships. Mach 3-4 at sea level is probably harder to intercept than Mach 6-8 coming in from high altitude.

I'm unaware of any thermal barrier coating that is, or any current weapon or proposed weapon that sustains a hypersonic cruise at sea level. Zircon cruises at 28km from what I've read, not sure it even has a low altitude mode.

Presumably allows it to be smaller overall. Shedding stages is more efficient for any launch. The first stage appears to be the short section behind the rear fins.

Well reports seem to disagree with this.

Because it uses a two stage rocket motor for launch instead of a single stage one.

Well the Zircon cruises at only M5.5, this one cruises at M6.2 and this one talks of M6 cruise at 23km altitude.

South Korea Reveals an Air-Launched Hypersonic Ship-Killer | MiGFlug.com Blog

South Korea's Hyundai Rotem has revealed an air-launched hypersonic anti-ship missile concept. What the new ship-killer means for the region's balance.

migflug.com

Very little is known of any Chinese hypersonic cruise missile tests, so difficult to say.

But rocket fuel has very bad specific impulse, one can even make a rocket fuel powered hypersonic cruise missile (infact indian LRAShM HGV is kind of hybrid of HGV and rocket cruising in end phase most probably).

 

[BMD]

But rocket fuel has very bad specific impulse, one can even make a rocket fuel powered hypersonic cruise missile (infact indian LRAShM HGV is kind of hybrid of HGV and rocket cruising in end phase most probably).

You're not understanding what I'm saying. Any hypersonic missile needs a rocket booster to get it to altitude and scramjet crusing speed and a 2-stage rocket is more efficient at that than a single stage. The Hycore has a scramjet after the 2-stage rocket booster. Stage 1 (black) is behind the rear fins, stage 2 (white) is form rear fins to behind front fins, stage 3 (orange) is the scramjet (nose to centre fins).

 

[Photon Vish]

You're not understanding what I'm saying. Any hypersonic missile needs a rocket booster to get it to altitude and scramjet crusing speed and a 2-stage rocket is more efficient at that than a single stage. The Hycore has a scramjet after the 2-stage rocket booster. Stage 1 (black) is behind the rear fins, stage 2 (white) is form rear fins to behind front fins, stage 3 (orange) is the scramjet (nose to centre fins).

View attachment 52685

Ohh, now i got it.

It's like using 2 rocket booster in place of 1 and not replacing the scramjet part with rocket booster.

Actually It's quite good, but may be make it little complex and costly, but i guess it doesn't matter if it can sink/unoperational 1 billion usd ship with 2 hits.