North Korea ICBM Hwasong-15 has 130 second first stage burnout

[Safriz]

Watch the video from 02:29 onwards

For Comparison the Tatan-II had the first stage burnout time of 155 Seconds.

 

[Safriz]

 

[amardeep mishra]

Watch the video from 02:29 onwards

For Comparison the Tatan-II had the first stage burnout time of 155 Seconds.

Hi !
NK is probably in early stages of developing an ICBM. Their reliance on liquid rocket motor is a testimony to that fact. The trend is towards making missiles compact-- with higher ISP propellant, composites, MEMS based IMU and actuators etc. If someone is going against this trend then it clearly signifies that they havent matured to the level where they can design a sophisticated ICBM.

 

[timmy_area51]

it looks just like an SLBM

 

[Figaro]

Hi !
NK is probably in early stages of developing an ICBM. Their reliance on liquid rocket motor is a testimony to that fact. The trend is towards making missiles compact-- with higher ISP propellant, composites, MEMS based IMU and actuators etc. If someone is going against this trend then it clearly signifies that they havent matured to the level where they can design a sophisticated ICBM.

Not exactly. Liquid fuel doesn't mean their program is unsophisticated. Russia's RS-28 and many other of its ICBMS rely on liquid fuel too ...

 

[Safriz]

Hi !
NK is probably in early stages of developing an ICBM. Their reliance on liquid rocket motor is a testimony to that fact. The trend is towards making missiles compact-- with higher ISP propellant, composites, MEMS based IMU and actuators etc. If someone is going against this trend then it clearly signifies that they havent matured to the level where they can design a sophisticated ICBM.

Russians still use liquid fueled ICBM even on their submarines.

it looks just like an SLBM

No its not. Too big to fit in any submarine .

 

[Ultima Thule]

Russians still use liquid fueled ICBM even on their submarines.


No its not. Too big to fit in any submarine .

they have only one liquid fueled land based ICBM R-36, rest is solid fueled based, TOPOL versions
and yes they have but gradually replace by solid fueled SLBM with
Bulava
/BORIE

 

[amardeep mishra]

Not exactly. Liquid fuel doesn't mean their program is unsophisticated. Russia's RS-28 and many other of its ICBMS rely on liquid fuel too ...

Hi @Figaro
Liquids does have higher ISP vis a vis a similar weight solid rocket but it is certainly not compact and requires some fueling time. And no it is not sophisticated by modern standards. Thanks!

Russians still use liquid fueled ICBM even on their submarines.

They use very old technology R-29s and their variants on their deltas doesnt mean that missile is modern or sophisticated. R-29s have their own fair share of issues related to metallurgy. For instance a solid fuel SLBM can be kept hermatically sealed in submarine silos for a long long time without having to worry about corrosion issues-- thats not the case with R-29.

 

[Maler]

Hi @Figaro
Liquids does have higher ISP vis a vis a similar weight solid rocket but it is certainly not compact and requires some fueling time. And no it is not sophisticated by modern standards. Thanks!

They use very old technology R-29s and their variants on their deltas doesnt mean that missile is modern or sophisticated. R-29s have their own fair share of issues related to metallurgy. For instance a solid fuel SLBM can be kept hermatically sealed in submarine silos for a long long time without having to worry about corrosion issues-- thats not the case with R-29.

AMARDEEP it may be unsophsticated but question is, can it hit the target at the range it is claiming? As for nuclear strike you don't need pin point accuracy!!!

 

[Dante80]

Solid fueled boosters trade performance, expensive mid-life maintenance and overall mass for mass density, field serviceability and response time. It is not imperative to have large solid fuel technology to field a competent ICBM system though. Hypergolics can do the job pretty well, and there are trade-offs for every application.

While - for example - fielding a solid fueled SLBM or mobile ICBM is a pretty nice upgrade due to the logistics involved, a silo based missile relying on hypergolics may be a lot more capable (AND modern, as most of the system capability depends on the bus after the booster) as a platform.

System sophistication actually depends on RV technology, ICs used for guidance, warhead sophistication, integrated decoys/counter-measures, compact heat-shielding, networking etc.

 

[Dante80]

Btw, if anyone is interested in the subject of liquid propulsion for military and space purposes, I cannot recommend enough Ignition! An Informal History of Liquid Rocket Propellants that the legendary John Drury Clark wrote many years ago.

It provides exceptional historic insight on the people, the organizations and the drama involved in researching and developing rocket propulsion in the 50's, 60's and 70's. And it does it in a devastatingly humorous way that the layman reader can (at least to a point) both comprehend and appreciate.

A required reading - in my honest opinion - for every rocket enthusiast and steely eyed missile man out there.
Grab it here: https://library.sciencemadness.org/library/books/ignition.pdf

 

[timmy_area51]

Russia 's TOPOL M was the height of post soviet russian missile technology . the SARMAT after that is too big and more of propaganda value . of course the american minuteman series et al . are more compact and practical.

sarmat

american slbm

indian ballistic missile

sLBM concept and size comparison

 

[amardeep mishra]

Hypergolics can do the job pretty well, and there are trade-offs for every application.

Indeed they can, because hyperbolics have higher isp compared to similar mass solid rocket. But as the trend is moving towards designing compact missiles, it is "unwise" to design a missile so gigantic and requiring hours of refueling.
Besides things get a lot more dangerous in the confines of a submarine. A liquid SLBM would need periodic check up for any corrosion-- as was the case with the R29.