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Chinese Hypersonic Developments (HGVs/HCMs)
- Thread starter A.Man
- Start date
Impressive!Thoughts on the range and payload of YJ-21. One thing that always intrigued me is how the YJ-21 with a dimension similar to DF-15 can achieve a much greater range despite being a slightly smaller rocket.. Let's compare:
YJ-21 DF-15A Range: 1500 km
Dim: 8.7m x 0.83m
Payload:?Range: 900km
Dim: 9.1m x 1m
Payload: 600kg
One way to get a greater range is to use a Sanger ballistics (You also lose energy by doing that), but I wonder if the same can be achieved by having a smaller payload. As the YJ-21 doesn't need a 600 warhead to inflict a mission kill on a carrier.
After some googling I found this graph: Link:
View attachment 135840
Assuming this the info in this graph is scalable for our range.
I'm also using Region A as I don't fully understand what each region represent, people better at rocket may want to correct me.
1500km/900km = 1.67
So I geed to figure out how much the 600kg warhead need to reduced to achieve a 1.67x increase in range.
In graph: 600kg, 250km ish range.
So we need the warhead mass for 250x1.67= 417 km range.
View attachment 135841
So got a warhead mass of 200kg, which is a warhead mass slightly smaller than the Harpoon (221km).
However, I think with a terminal speed of Mach10, 200kg is enough to achieve a mission kill on a Carrier, but def not sink it.
What do you guys think? Feel free to improve upon my finding.
Great work!Thoughts on the range and payload of YJ-21. One thing that always intrigued me is how the YJ-21 with a dimension similar to DF-15 can achieve a much greater range despite being a slightly smaller rocket.. Let's compare:
YJ-21 DF-15A Range: 1500 km
Dim: 8.7m x 0.83m
Payload:?Range: 900km
Dim: 9.1m x 1m
Payload: 600kg
One way to get a greater range is to use a Sanger ballistics (You also lose energy by doing that), but I wonder if the same can be achieved by having a smaller payload. As the YJ-21 doesn't need a 600 warhead to inflict a mission kill on a carrier.
After some googling I found this graph: Link:
View attachment 135840
Assuming this the info in this graph is scalable for our range.
I'm also using Region A as I don't fully understand what each region represent, people better at rocket may want to correct me.
1500km/900km = 1.67
So I geed to figure out how much the 600kg warhead need to reduced to achieve a 1.67x increase in range.
In graph: 600kg, 250km ish range.
So we need the warhead mass for 250x1.67= 417 km range.
View attachment 135841
So got a warhead mass of 200kg, which is a warhead mass slightly smaller than the Harpoon (221km).
However, I think with a terminal speed of Mach10, 200kg is enough to achieve a mission kill on a Carrier, but def not sink it.
What do you guys think? Feel free to improve upon my finding.
I will build on your findings. Assuming the warhead is an inert slug made of Tungsten, and that it is travelling at Mach 10. The kinetic energy this warhead will carry is around 1/2 x 200 x 33300², which is around 1 GJ.
Assuming an impact time of 1 millisecond, this warhead can generate about 660 million newtons of force.
This can easily generate enough force to buckle even the strongest steel. For example, HY-100 steel only has a yield strength of 930MPa, and a cone shaped projectile can easily exceed that twice over.
In short, an impact from an inert warhead can penetrate the flight deck completely. Depending on where the missile hits, the arresting gear and catapults can be disabled. More importantly, since the warhead is heated up during reentry, the glowing hot warhead may hit the hanger and set fire to any planes or fuel dumps in the area. IMO, we are looking at flight deck damage and fires at the minimum. Hard to say if it is enough to sink the carrier, but certainly enough to put it out of action for a while.
Terminal velocity probably won’t be Mach 10.Great work!
I will build on your findings. Assuming the warhead is an inert slug made of Tungsten, and that it is travelling at Mach 10. The kinetic energy this warhead will carry is around 1/2 x 200 x 33300², which is around 1 GJ.
Assuming an impact time of 1 millisecond, this warhead can generate about 660 million newtons of force.
This can easily generate enough force to buckle even the strongest steel. For example, HY-100 steel only has a yield strength of 930MPa, and a cone shaped projectile can easily exceed that twice over.
In short, an impact from an inert warhead can penetrate the flight deck completely. Depending on where the missile hits, the arresting gear and catapults can be disabled. More importantly, since the warhead is heated up during reentry, the glowing hot warhead may hit the hanger and set fire to any planes or fuel dumps in the area. IMO, we are looking at flight deck damage and fires at the minimum. Hard to say if it is enough to sink the carrier, but certainly enough to put it out of action for a while.