The newest North Korean missile "Hwasong-12" (HS-12)

Norbert Brügge, Germany

Update: 24.05.2017
 

Some martial news, included a new designed HS-12 missile, were presented at the parade on 15 April 2017.

New HS-12 on HS-10 TEL ! 

2017, May 14  -- North Korea has successfully tested its new HS-12 in flight

 

Engines are not complete here

 Some unsharp pictures of the main engine and its steering engines

 


First analysis:

The new HS-12 missile is up to now a mystery. But it seems to be a
up-scaled Nodong missile with four steering engines. In any case, it is a single-stage rocket with a diameter of probably 1.50 m.
The cablel duct is on the entire length not interrupted and there is no indication of a stages separation plane. The engine bay suggests that the missile uses not a SLBM-like engine. The cable duct ends higher up and it is to see a slightly conical skirt with weld seam, which means that an engine is used not inside the tank as for HS-10 or HS-13. But the assumption, the missile uses the recently tested engine (one combustor of RD-250 + four RD-855), is
not right. The fuel would be consumed after 83.5 seconds.
In addition, the time-span between test and application is much too short. It seems "the newly-developed rocket engine" is an old Nodong engine, supplemented with  four powerful steering engines, according to the pattern Simorgh/Unha-1.

  

Next analysis:
There is no longer any doubt that the HS-12 is a widened Nodong+ (HS-9) or Ghadr-H. The  takeoff thrust is increased (+ about 133 kN) by adding four steering engines (with its own turbopump). The total thrust is then about 418 kN.
The WH is equipped with a telemetry antenna and obviously also with a extra PBV.

 

  

Engines

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Burn time

Flow rate

Total Imp (vac)

kN

N*s/kg

kN

N*s/kg

-

tons

s

t/s

MN*s

 Nodong

284.4

2422

313.1

2667

UDMH/AK-27

22.00 *

127

0.1174

57.9

LRE-15 (4)

133.4

2393

147.0

2638

127

0.0557

  * Propellant load 150% in compare to HS-9