Aerospace Development Administration (NADA) * Academy of National Defence Science
2023, May -- Unha-X remains Unha-X. The
long standstill on the Sohae SLG is an indication that the Unha-X is not a priority
at the moment. N.K. do not have a GEO satellite yet. Instead, they initially
want to transport smaller observation satellites into a SSO. For this they can
use derivative of missiles, for example HS-15A or HS -17A. For this purpose, a launch site is obviously being built on the
2022, March 16 --
There was probably a failed launch
of a big rocket that day. Debris has fallen near Pyongyang. The failure was
associated with a huge detonation on midair.
It is possible that this failed launch was the first attempt to test a single-stage
HS-17+TR with 6 engines (3x2 combustors), that use as the first stage of the
2019, Dec. 13 -- "Another cruicial test was successful conducted at the Sohae
SLG from 22.41 to 22.48 on December 13. The research successes being registered
by us in defence science one after another recently will be applied to further
bolstering up the reliable strategic nuclear deterrent of the DPRK.”
A fther hidden static test(s) on December 13
between 21:41 to 21:48 on the Sohae SLG (?).
Comment: The presumed seven minutes burning time is nonsense. This
is only a period in which one or more short static tests have been carried
2019, Dec. 07 -- "A very important test took
place at the Sohae SLG on the afternoon of December 7. The Academy of the
National Defence Scienc of the DPRK made a report on the successful test of
great significance to the Central Commitee of the Worker's Party."
A hidden static test of the Unha-X first
stage on the Sohae SLG (?)
Comment: .The engine test stand is untouched. The various small materials
(not a container, only a long shadow) are an indication of construction works
in the adjacent building during the past days. The old scrap in front of a
bunker has not been removed yet. Further presented "evidence" for use the
test stand are ridiculous.
NK does not have to test a new engine. They have tested everything they need,
even an engine with two combustors (HS-15). Now they only have to test an
interaction of several engines (3x2 = 6?) for a SLV. So I suspected a static
test on the launch pad. Why are there no current satellite photos of the Sohae
2017 - 2018 -- Latest end
of 2017 an analyst should be clear that the engine "Pektusan" primarily is
qualified for a future Unha-X, as well as what configuration the future SLV
will have. Equipped with the engine "Pektusan" the HS-12, HS-14 and HS-15
have served in addition to the demonstration of supposedly military strength
also for the qualification of the engine. In the meantime they master the
engine perfectly. It can be equipped with one or two combustors (Pektusan-A1
/ -A2) and was even presented a gimbal type engine (Pektusan-B). It is very
likely that the HS-15 with the gimbal type engine (Pektusan-B) is identical
to a second stage of the Unha-X. For a first stage, three Pektusan-A2 engines
may be used, where, like the RD-250, the turbopump is mounted on a platform.
For control then four additional smaller engines are required. For a third
stage, the engines of the second stage of the Unha-3 are expected to be used.
2014 - 2016 -- Commercial satellite imagery indicates that North Korea
preparing the Sohae Satellite Launching Station (“Tongchang-ri”) for launching
of a new larger space launch vehicle. The Sohae gantry tower has been undergoing
significant modifications. So will be increased the gantry about three sections
of 46 m to 60 m (without crane) !
The rocket by a source is described "as a booster for a super ICBM or a heavy-lift
space launcher. It is completely new from what they have done so far."
It could be a totally changed space launcher with 3 m diameter and new engines.
But North Korea has not the know-how to develop new large engines. That can
only mean that already exist the technical requirements for such a propulsion.
What was previously just a guess, seems to be confirmed: North Korea has at
least blueprints of an old Soviet ICBM engine. The new North Korean engine
"Pektusan" is clearly comparable
to the RD-250 engine of the KB Glushko. Two combustors use a common
turbopump. Typical is the low arrangement of the TP between the nozzles.
It is pointless to suggest that there is another engine. It is completely
clear that there is a pair with a turbopump in the middle, mounted on a platform.
Such engines has constructed only Glushko. North Korea have not the know-how
to develop an engine of this magnitude itself.
The display (left) shows only one engine for the test. The lowered TP on the
platform makes sense only when a second engine is added in future.
"Pektusan 80 tf liquid rocket" is written in red
Han Ho Seok
2017, December (SEOUL) -- North Korea will
launching its new large SLV in September
2018, said a South Korean source. The new rocket
would be larger as the Unha-3. A "defector" said the new missile would be
considered the "Unha-4". Development of the rocket body is all but complete,
but it is expected to take about months to prepare for a launch.
Probably we already saw the two upper stages of the new SLV in the test. (HS-15)
2017, March 19 -- North Korea
has successfully conducted the ground test of its new rocket engine in
(still without the second combustor), added with four steering engines. According
to the North Korean news agency KCNA, the test measured the thrust power in
the combustion chamber, the structural safety and reliability of the engine,
and the movement of the turbine.
2016, Sept. 20
-- North Korea has successfully conducted the ground test of a
new rocket engine, the country's state
news agency reported.
North Korean leader Kim Jong-Un visited the Sohae Space Center to guide the
test of "a new type high-power engine of a carrier rocket for the geo-stationary
satellite," the Korean Central News Agency (KCNA) said.
This test was “aimed to make a final confirmation of the feature of combustion
chamber, operation accuracy of valves and control systems and structural reliability
of the engine during 200 seconds-long working time". North Korea also says
the engine has a thrust of 80 tons of force
! However, this refers to twin-combustor arrangement.
Engine arrangements in comparison