The newest North Korean nuclear ICBM "Hwasong-14" (HS-14)
(a widened two-stage variant of HS-12)

Norbert Brügge, Germany

Update: 24.07.2017
 

2017, July 04 -- North Korea has tested its new HS-14 ICBM in flight. It seems to be a widened two-stage variant of HS-12.

 

HS-14 on a HS-13 TEL

Second stage

Again a free standing launch

Diameter

 Engine details

 

Second stage engine test ?


          

New analysis:

The HS-14 is a widened variant of the HS-12 with an added second stage. In this design, North Korea now has a real operational ICBM. It replaces the HS-13 project, which was probably discontinued due to problems with the Soviet 4D10 main engines.

So is the speculation that the HS-14 is related to the HS-10 is nonsense. On the other hand, it is now sure  that the HS-14 has a larger diameter than the HS-12 (1.70m). The diameter of the second stage is 1.25m. Also sure is that it is a lightweight missile with tank framework.

The assumption, the first stage of the missile uses the recently
tested engine (one combustor of RD-250) is probably true. The added steering engines comes from the HS-13 (R-27 origin). The takeoff thrust is approximately 464 kN.

The second stage is probably equipped with an engine of low thrust and long burn time (4D10V?). Therefore an altitude of 2800 km could be reached. The first stage has reached an altitude of 535 or 585 km.

 

Diameter 1.70 m

 

Stage

Engines

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Burn time

Flow rate

Total Imp

kN

N*s/kg

kN

N*s/kg

-

tons

s

t/s

MN*s (vac)

1

 RD-250

394.1

2644

440.6

2956

UDMH/N204

28.95

163

0.1491

84.6

Verniers (4)

70.0

2452

78.4

2746

163

0.0286

2

4D10V (2)

    ? ? ? ?      

 


Hwasong-14 and RD-250 Engine: Russia, Ukraine, Convergent Evolution?

by Marko Beljac
http://analysans.net/1089-2/
As noted previously the March 18 revolution, 80 tonne thrust, UDMH propelled engine is a key factor behind North Korea’s Hwasong-12 and Hwasong-14 missiles.
The Washington Post has carried an article suggesting that the March 18 revolution engine is essentially the Soviet era RD-250, which powered the first stage of the R-36 ICBM. Therefore, it is suggested, the March 18 revolution engine was developed with assistance. This suggestion is based on analysis by Mike Elleman, which forms the core of the article.

The secret to Kim’s success? Some experts see Russian echoes in North Korea’s missile advances
The Washington Post, July 10, 2017
Article by Joby Warrick
Mike Elleman, a missile expert at the International Institute for Strategic Studies, is preparing to publish an analysis comparing the engine used in the Hwasong-12 and Hwasong-14 with the Soviet-era RD-250, using photos that highlight nearly identical features, including cooling tubes, exhaust nozzles and the four auxiliary engines that steer the rocket.

I guess that here will again one of my analysis "sold" without adding any words to who the actual author is of the first fundamental analysis of this topic.