Markus Schiller Profile picture
Apr 14 13 tweets 5 min read Twitter logo Read on Twitter
North Korea promised a lot over the past years, but they keep delivering. Solid ICBMs were hinted at as early as April 2017. 1/ Image
They also had included a solid ICBM in their current 5-Year-Plan, I think. Don’t nail me down on that one, though. I think @JosephHDempsey just mentioned an announcement of the solid ICBM in January 2021. /2
As always with North Korea, the speed of turning that idea into reality was breathtaking. They fired a big “140 tf” solid motor in December 2022, just 4 months ago. /3 Image
And just yesterday, they successfully launched their three stage solid ICBM “Hwasong-18”. As a rocketeer, congratulations to that achievement. /4 Image
There are nice photos and videos available from the launch. A treasure trove of information, but also looks cool 😎 Thanks to NK! /5

One thing to verify with that is, for example, first stage burn time, which should be around 65 seconds. And it is. /6 Image
Why? Because a smart way to design a three stage solid ICBM of that size and performance would be that configuration we’re seeing, and the characteristics that follow from this choice. /7 Image
As you can see, others had opted for similar choices in the past. Take the Soviets, or the USA. /8 Image
Nonetheless, it’s still surprising how close so many details of the Hwasong-18 and its operations resemble those from the Topol family. Just look at this video (I only had a mobile Topol launch at hand, the successor Topol-M should look similar. /9
These parallels in technology are quite common in the North Korean program, having started with identical Scud copies in the 1980s, up to the engines that power their liquid ICBMs (which all were copied with almost no visible NK development and tests, and very few failures). /10 Image
Therefore, the quick success of the Hwasong-18 can be seen as another proof of the NK genius at work. Where it took Soviets and China decades(!) to get solid ICBMs, NK just does it better, it seems. Also, none of those countries would dare to support NK missile development. /11
So much for now. On the road ahead: NK will probably declare the HS-18 operational and in serial production, and start fielding large numbers next month. Perhaps we’ll see another launch. Or not. You never know with North Korea. 12/12

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More from @RocketSchiller

Oct 12, 2020
Some thoughts on the new NK Pukguksong-4A SLBM. First, dimensions. Always hard to figure that out, but I doubt the 2.15 m diameter I’ve seen floating around. That would put it in one league with the Russian Bulava, Chinese JL-2, and US Trident II D5. 1/x
While some analysts seem to expect such a leap from NK, I have my doubts. It took Russia a decade, and China longer than that, to get such a missile working. Also, the soldiers sitting in front of the PS-4A missile would all have to be basketball players if it was 2.15 m. 2/x
Nonetheless, the PS-4A is an interesting design. You can see a flat cable raceway running along the top, indicating a 2 stage configuration (cables are never run through the combustion chamber of a solid rocket motor, and you see the cables being mounted outside 2 times). 3/x
Read 8 tweets
Nov 6, 2019
The statement from a Seoul official that "North Korea is not capable of firing ICBMs from mobile launchers" should not be a surprise. It seems not everyone had a close look at the available Hwasong-14 and Hwasong-15 launch photos. (1/5)

en.yna.co.kr/view/AEN201911…
There was some infrastructure hidden in a nearby trench at the Hwasong-14 maiden flight in July 2017. Cables were connecting the rocket with that trench. (2/5)
Again the same at the second Hwasong-14 launch: Cables and a trench, but also something hidden behind a fence. (3/5)
Read 5 tweets
Sep 4, 2019
The following Thread is not to be seen as a full analysis, but more like some thoughts on things that should have been pointed out a while ago. Since they were not, I will do that now. So, here are some thoughts on the new #NorthKorea “ATACMS-lookalike” #missile. 1/19
According to open source knowledge, this missile type was first launched August 10, 2019 (2 launches 16 minutes apart), and again August 16 (2 launches 15 minutes apart). 2/19
The reported range and peak altitude at flight was 400 km with 48 km (Aug 10) and 230 km with 30 km (Aug 16). That raises the question why NK developed this system. They already have 7(!) different operational systems for that range: 3/19
Read 20 tweets

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